diff --git a/examples/device-dashboard/net.c b/examples/device-dashboard/net.c
index 10816c5b..455c74af 100644
--- a/examples/device-dashboard/net.c
+++ b/examples/device-dashboard/net.c
@@ -56,14 +56,14 @@ uint64_t mg_now(void) {
 int ui_event_next(int no, struct ui_event *e) {
   if (no < 0 || no >= MAX_EVENTS_NO) return 0;
 
-  srand(no);
+  srand((unsigned) no);
   e->type = (uint8_t) rand() % 4;
   e->prio = (uint8_t) rand() % 3;
   e->timestamp =
-      (unsigned long) (mg_now() - 86400 * 1000 /* one day back */ +
+      (unsigned long) ((int64_t) mg_now() - 86400 * 1000 /* one day back */ +
                        no * 300 * 1000 /* 5 mins between alerts */ +
                        1000 * (rand() % 300) /* randomize event time */) /
-      1000;
+      1000UL;
 
   mg_snprintf(e->text, MAX_EVENT_TEXT_SIZE, "event#%d", no);
   return no + 1;
@@ -163,7 +163,7 @@ static void handle_stats_get(struct mg_connection *c) {
 static size_t print_events(void (*out)(char, void *), void *ptr, va_list *ap) {
   size_t len = 0;
   struct ui_event ev;
-  int pageno = va_arg(*ap, unsigned);
+  int pageno = va_arg(*ap, int);
   int no = (pageno - 1) * EVENTS_PER_PAGE;
   int end = no + EVENTS_PER_PAGE;
 
diff --git a/examples/microchip/same54/Makefile b/examples/microchip/same54/Makefile
new file mode 100644
index 00000000..9dfe63c6
--- /dev/null
+++ b/examples/microchip/same54/Makefile
@@ -0,0 +1,56 @@
+CFLAGS = -W -Wall -Wextra -Wundef -Wshadow -Wdouble-promotion
+CFLAGS += -Wformat-truncation -fno-common -Wconversion
+CFLAGS += -g -O2 -ffunction-sections -fdata-sections
+CFLAGS += -I. -Icmsis_core/CMSIS/Core/Include
+CFLAGS += -D__SAME54P20A__ -Icmsis_sam/include #-Icmsis_sam/xc32/include
+#CFLAGS += -mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16
+CFLAGS += -mcpu=cortex-m4 -mthumb -mfloat-abi=softfp -mfpu=fpv4-sp-d16
+LDFLAGS ?= -Tlink.ld -nostartfiles -nostdlib --specs nano.specs -lc -lgcc -Wl,--gc-sections -Wl,-Map=$@.map
+
+SOURCES = main.c syscalls.c startup.c
+#SOURCES += cmsis_sam/xc32/ATSAME54P20A/startup_atsame54p20a.c
+
+SOURCES += mongoose.c net.c packed_fs.c
+CFLAGS += -DMG_ENABLE_TCPIP=1 -DMG_ARCH=MG_ARCH_NEWLIB -DMG_ENABLE_CUSTOM_MILLIS=1 #-DMG_ENABLE_LINES=1
+CFLAGS += -DMG_ENABLE_DRIVER_SAME54=1 -DMG_ENABLE_CUSTOM_RANDOM=1 -DMG_ENABLE_PACKED_FS=1 $(CFLAGS_EXTRA)
+
+VCON_API_KEY=IBrJL5K4arSGMiAXbUKWdG6I2gM
+
+ifeq ($(OS),Windows_NT)
+  RM = cmd /C del /Q /F
+else
+  RM = rm -rf
+endif
+
+build: firmware.bin
+
+firmware.elf: cmsis_core cmsis_sam hal.h link.ld Makefile $(SOURCES) 
+	arm-none-eabi-gcc $(SOURCES) $(CFLAGS) $(CFLAGS_EXTRA) $(LDFLAGS) -o $@
+
+firmware.bin: firmware.elf
+	arm-none-eabi-objcopy -O binary $< $@
+
+flash: firmware.bin
+	bossac -p /dev/cu.usb* -w -v -b $<
+
+cmsis_core:
+	git clone --depth 1 -b 5.9.0 https://github.com/ARM-software/CMSIS_5 $@
+
+cmsis_sam:
+	curl -sL https://packs.download.microchip.com/Microchip.SAME54_DFP.3.8.234.pack -o $@.zip
+	mkdir $@ && cd $@ && unzip ../$@.zip
+#	git clone --depth 1 -b master https://github.com/modm-io/cmsis-header-sam $@
+
+clean:
+	$(RM) firmware.* cmsis_* *.zip
+
+# Automated test via https://vcon.io/automated-firmware-tests/. Set VCON_API_KEY and update DEVICE_URL
+DEVICE_URL ?= https://dash.vcon.io/api/v3/devices/9
+fota: CFLAGS += -DUART_DEBUG=USART1
+fota: firmware.bin
+	curl --fail-with-body -su :$(VCON_API_KEY) $(DEVICE_URL)/ota --data-binary @$<
+test: fota
+	curl --fail-with-body -su :$(VCON_API_KEY) $(DEVICE_URL)/tx?t=5 | tee /tmp/output.txt
+	egrep '^tick:.*CPU 180 MHz' /tmp/output.txt
+watch: fota
+	curl --fail-with-body -su :$(VCON_API_KEY) $(DEVICE_URL)/tx?t=999
diff --git a/examples/microchip/same54/hal.h b/examples/microchip/same54/hal.h
new file mode 100644
index 00000000..226548b8
--- /dev/null
+++ b/examples/microchip/same54/hal.h
@@ -0,0 +1,219 @@
+// Copyright (c) 2022 Cesanta Software Limited
+// SPDX-License-Identifier: MIT
+//
+// https://ww1.microchip.com/downloads/aemDocuments/documents/MCU32/ProductDocuments/DataSheets/SAM-D5x-E5x-Family-Data-Sheet-DS60001507.pdf
+// https://ww1.microchip.com/downloads/en/DeviceDoc/70005321A.pdf
+
+#ifndef LED_PIN
+#define LED_PIN PIN('C', 18)
+#endif
+
+#ifndef BUTTON_PIN
+#define BUTTON_PIN PIN('B', 31)
+#endif
+
+#ifndef UART_DEBUG
+#define UART_DEBUG USART1
+#endif
+
+#pragma once
+#include <sam.h>
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#define BIT(x) (1UL << (x))
+#define SETBITS(R, CLEARMASK, SETMASK) (R) = ((R) & ~(CLEARMASK)) | (SETMASK)
+#define PIN(bank, num) ((((bank) - 'A') << 8) | (num))
+#define PINNO(pin) (pin & 255)
+#define PINBANK(pin) (pin >> 8)
+
+static inline void spin(volatile uint32_t count) {
+  while (count--) (void) 0;
+}
+
+static inline uint32_t clock_sys_freq(void) {
+  return 48000000U;
+}
+
+enum { GPIO_MODE_INPUT, GPIO_MODE_OUTPUT, GPIO_MODE_AF, GPIO_MODE_ANALOG };
+enum { GPIO_OTYPE_PUSH_PULL, GPIO_OTYPE_OPEN_DRAIN };
+enum { GPIO_SPEED_LOW, GPIO_SPEED_MEDIUM, GPIO_SPEED_HIGH, GPIO_SPEED_INSANE };
+enum { GPIO_PULL_NONE, GPIO_PULL_UP, GPIO_PULL_DOWN };
+#define GPIO(N) ((port_group_registers_t *) (PORT_BASE_ADDRESS + 0x80 * (N)))
+typedef port_group_registers_t GPIO_TypeDef;
+static inline GPIO_TypeDef *gpio_bank(uint16_t pin) {
+  return GPIO(PINBANK(pin));
+}
+static inline void gpio_toggle(uint16_t pin) {
+  gpio_bank(pin)->PORT_OUTTGL = BIT(PINNO(pin));
+}
+static inline bool gpio_read(uint16_t pin) {
+  return gpio_bank(pin)->PORT_IN & BIT(PINNO(pin));
+}
+static inline void gpio_write(uint16_t pin, bool val) {
+  GPIO_TypeDef *gpio = gpio_bank(pin);
+  if (val) {
+    gpio->PORT_OUTSET = BIT(PINNO(pin));
+  } else {
+    gpio->PORT_OUTCLR = BIT(PINNO(pin));
+  }
+}
+static inline void gpio_init(uint16_t pin, uint8_t mode, uint8_t type,
+                             uint8_t speed, uint8_t pull, uint8_t af) {
+  (void) type, (void) speed, (void) pull, (void) af;
+  GPIO_TypeDef *gpio = gpio_bank(pin);
+  uint32_t mask = BIT(PINNO(pin));
+  MCLK_REGS->MCLK_APBBMASK |= MCLK_APBBMASK_PORT_Msk;
+  if (mode == GPIO_MODE_INPUT) {
+    gpio->PORT_DIRCLR = mask;
+  } else {
+    gpio->PORT_DIRSET = mask;
+  }
+}
+static inline void gpio_input(uint16_t pin) {
+  gpio_init(pin, GPIO_MODE_INPUT, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH,
+            GPIO_PULL_NONE, 0);
+}
+static inline void gpio_output(uint16_t pin) {
+  gpio_init(pin, GPIO_MODE_OUTPUT, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH,
+            GPIO_PULL_NONE, 0);
+}
+
+typedef sercom_usart_int_registers_t USART_TypeDef;
+#define USART1 ((USART_TypeDef *) SERCOM0_BASE_ADDRESS)
+#define USART2 ((USART_TypeDef *) SERCOM1_BASE_ADDRESS)
+#define USART3 ((USART_TypeDef *) SERCOM2_BASE_ADDRESS)
+static inline bool uart_init(USART_TypeDef *uart, unsigned long baud) {
+  uint16_t rx = 0, tx = 0;  // Pins
+  uint8_t rx_mux = 0, tx_mux = 0;
+  if (uart == USART1) {
+    MCLK_REGS->MCLK_APBAMASK |= MCLK_APBAMASK_SERCOM0_Msk;
+    GCLK_REGS->GCLK_PCHCTRL[SERCOM0_GCLK_ID_CORE] =
+        GCLK_PCHCTRL_GEN_GCLK0 | GCLK_PCHCTRL_CHEN_Msk;
+    GCLK_REGS->GCLK_PCHCTRL[SERCOM0_GCLK_ID_SLOW] =
+        GCLK_PCHCTRL_GEN_GCLK3 | GCLK_PCHCTRL_CHEN_Msk;
+    tx = PIN('A', 4), rx = PIN('A', 5);
+    rx_mux = MUX_PA05D_SERCOM0_PAD1, tx_mux = MUX_PA04D_SERCOM0_PAD0;
+  } else if (uart == USART2) {
+    MCLK_REGS->MCLK_APBAMASK |= MCLK_APBAMASK_SERCOM1_Msk;
+    tx = PIN('C', 27), rx = PIN('C', 28);
+  } else if (uart == USART3) {
+    MCLK_REGS->MCLK_APBBMASK |= MCLK_APBBMASK_SERCOM2_Msk;
+    tx = PIN('A', 9), rx = PIN('A', 8);
+  } else {
+    return false;
+  }
+  gpio_bank(rx)->PORT_WRCONFIG =
+      PORT_WRCONFIG_PMUX(rx_mux) | PORT_WRCONFIG_WRPMUX(1) |
+      PORT_WRCONFIG_PMUXEN(1) | PORT_WRCONFIG_WRPINCFG(1) | BIT(PINNO(rx));
+  gpio_bank(tx)->PORT_WRCONFIG =
+      PORT_WRCONFIG_PMUX(tx_mux) | PORT_WRCONFIG_WRPMUX(1) |
+      PORT_WRCONFIG_PMUXEN(1) | PORT_WRCONFIG_WRPINCFG(1) | BIT(PINNO(tx));
+  uart->SERCOM_CTRLA = SERCOM_USART_INT_CTRLA_DORD(1) |
+                       SERCOM_USART_INT_CTRLA_MODE(1 /* INT_CLK */) |
+                       SERCOM_USART_INT_CTRLA_RXPO(1 /* PAD1 */) |
+                       SERCOM_USART_INT_CTRLA_TXPO(0 /* PAD0 */) |
+                       SERCOM_USART_INT_CTRLA_SAMPR(1);
+  uart->SERCOM_BAUD = (uint16_t) (clock_sys_freq() / (16 * baud));
+  uart->SERCOM_CTRLB = SERCOM_USART_INT_CTRLB_RXEN(1) |
+                       SERCOM_USART_INT_CTRLB_TXEN(1) |
+                       SERCOM_USART_INT_CTRLB_CHSIZE(0);
+  while (uart->SERCOM_SYNCBUSY & SERCOM_USART_INT_SYNCBUSY_CTRLB_Msk) spin(1);
+  uart->SERCOM_CTRLA |= SERCOM_USART_INT_CTRLA_ENABLE(1);
+  while (uart->SERCOM_SYNCBUSY & SERCOM_USART_INT_SYNCBUSY_ENABLE_Msk) spin(1);
+  return true;
+}
+static inline void uart_write_byte(USART_TypeDef *uart, uint8_t byte) {
+  while (!(uart->SERCOM_INTFLAG & SERCOM_USART_INT_INTFLAG_DRE_Msk)) spin(1);
+  uart->SERCOM_DATA = byte;
+}
+static inline void uart_write_buf(USART_TypeDef *uart, char *buf, size_t len) {
+  while (len-- > 0) uart_write_byte(uart, *(uint8_t *) buf++);
+}
+static inline bool uart_read_ready(USART_TypeDef *uart) {
+  return (uart->SERCOM_INTFLAG & SERCOM_USART_EXT_INTFLAG_RXC_Msk);
+}
+static inline uint8_t uart_read_byte(USART_TypeDef *uart) {
+  return (uint8_t) (uart->SERCOM_DATA & 255U);
+}
+
+static inline void rng_init(void) {
+  MCLK_REGS->MCLK_APBCMASK |= MCLK_APBCMASK_TRNG_Msk;
+  TRNG_REGS->TRNG_CTRLA = TRNG_CTRLA_ENABLE_Msk;
+}
+static inline uint32_t rng_read(void) {
+  while ((TRNG_REGS->TRNG_INTFLAG & TRNG_INTFLAG_DATARDY_Msk) == 0) spin(1);
+  return TRNG_REGS->TRNG_DATA;
+}
+
+#define UID_BASE_W0 0x008061FC    // Word 0 location of the 128-bit chip ID
+#define UID_BASE_W1_3 0x00806010  // Words 1-3 location of the 128-bit chip ID
+
+#define UUID(n) ((n >= 0 && n <= 3) ? \
+                     (((uint8_t *) UID_BASE_W0)[n]) : \
+                     (((uint8_t *) UID_BASE_W1_3)[n - 4]))
+
+#define GENERATE_LOCALLY_ADMINISTERED_MAC()                         \
+  {                                                                 \
+    2, UUID(0) ^ UUID(1) ^ UUID(2), UUID(3) ^ UUID(4) ^ UUID(5),    \
+        UUID(6) ^ UUID(7) ^ UUID(8), UUID(9) ^ UUID(10) ^ UUID(11), \
+        UUID(12) ^ UUID(13) ^ UUID(14) ^ UUID(15)                   \
+  }
+
+static inline bool timer_expired(volatile uint64_t *t, uint64_t prd,
+                                 uint64_t now) {
+  if (now + prd < *t) *t = 0;                    // Time wrapped? Reset timer
+  if (*t == 0) *t = now + prd;                   // Firt poll? Set expiration
+  if (*t > now) return false;                    // Not expired yet, return
+  *t = (now - *t) > prd ? now + prd : *t + prd;  // Next expiration time
+  return true;                                   // Expired, return true
+}
+
+static inline void clock_init(void) {
+  SCB->CPACR |= (15U << 20);                // Enable FPU
+  SysTick_Config(clock_sys_freq() / 1000);  // Sys tick every 1ms
+}
+
+static inline void gpio_set_irq_handler(uint16_t pin, void (*fn)(void *),
+                                        void *arg) {
+  (void) pin, (void) fn, (void) arg;
+}
+
+static inline void ethernet_init(void) {
+  uint16_t pins[] = {PIN('A', 12), PIN('A', 13), PIN('A', 14), PIN('A', 15),
+                     PIN('A', 17), PIN('A', 18), PIN('A', 19), PIN('C', 11),
+                     PIN('C', 12), PIN('C', 20)};
+  uint32_t af[] = {MUX_PA12L_GMAC_GRX1,  MUX_PA13L_GMAC_GRX0,
+                   MUX_PA14L_GMAC_GTXCK, MUX_PA15L_GMAC_GRXER,
+                   MUX_PA17L_GMAC_GTXEN, MUX_PA18L_GMAC_GTX0,
+                   MUX_PA19L_GMAC_GTX1,  MUX_PC11L_GMAC_GMDC,
+                   MUX_PC12L_GMAC_GMDIO, MUX_PC20L_GMAC_GRXDV};
+
+  MCLK_REGS->MCLK_APBBMASK |= MCLK_APBBMASK_PORT_Msk;
+
+  for (size_t i = 0; i < sizeof(pins) / sizeof(pins[0]); i++) {
+    int bank = PINBANK(pins[i]), no = PINNO(pins[i]);
+    PORT_REGS->GROUP[bank].PORT_PINCFG[no] |= PORT_PINCFG_PMUXEN_Msk;
+    volatile uint8_t *m = &PORT_REGS->GROUP[bank].PORT_PMUX[no / 2], v = m[0];
+    if (no & 1) {
+      m[0] = (uint8_t) ((v & ~0xf0) | PORT_PMUX_PMUXO(af[i]));
+    } else {
+      m[0] = (uint8_t) ((v & ~0x0f) | PORT_PMUX_PMUXE(af[i]));
+    }
+  }
+
+  PORT_REGS->GROUP[0].PORT_PINCFG[17] |= PORT_PINCFG_DRVSTR_Msk;
+  PORT_REGS->GROUP[0].PORT_PINCFG[18] |= PORT_PINCFG_DRVSTR_Msk;
+  PORT_REGS->GROUP[0].PORT_PINCFG[19] |= PORT_PINCFG_DRVSTR_Msk;
+
+  // Reset PHY
+  uint16_t phy_pin = PIN('C', 21);
+  gpio_output(phy_pin);
+  gpio_write(phy_pin, false);
+  spin(999);
+  gpio_write(phy_pin, true);
+  spin(999);
+}
diff --git a/examples/microchip/same54/link.ld b/examples/microchip/same54/link.ld
new file mode 100644
index 00000000..f66bbb90
--- /dev/null
+++ b/examples/microchip/same54/link.ld
@@ -0,0 +1,25 @@
+ENTRY(Reset_Handler);
+MEMORY {
+  flash(rx) : ORIGIN = 0x00000000, LENGTH = 1024k
+  sram(rwx) : ORIGIN = 0x20000000, LENGTH = 256k
+}
+_estack     = ORIGIN(sram) + LENGTH(sram);
+
+SECTIONS {
+  .vectors  : { FILL(256) KEEP(*(.vectors)) } > flash
+  .text     : { *(.text*) }         > flash
+  .rodata   : { *(.rodata*) }       > flash
+
+  .data : {
+    _sdata = .;
+    *(.first_data)
+    *(.data SORT(.data.*))
+    _edata = .;
+  } > sram AT > flash
+  _sidata = LOADADDR(.data);
+
+  .bss : { _sbss = .; *(.bss SORT(.bss.*) COMMON) _ebss = .; } > sram
+
+  . = ALIGN(8);
+  _end = .;
+}
diff --git a/examples/microchip/same54/main.c b/examples/microchip/same54/main.c
new file mode 100644
index 00000000..14e54b49
--- /dev/null
+++ b/examples/microchip/same54/main.c
@@ -0,0 +1,78 @@
+// SPDX-FileCopyrightText: 2022-2023 Cesanta Software Limited
+// SPDX-License-Identifier: MIT
+
+#include "hal.h"
+#include "mongoose.h"
+#include "net.h"
+
+#define BLINK_PERIOD_MS 500  // LED blinking period in millis
+#define LOG_PERIOD_MS 1000   // Info log period in millis
+
+void SystemInit(void) {  // Called automatically by startup code
+  clock_init();
+  rng_init();
+}
+
+static volatile uint64_t s_ticks;  // Milliseconds since boot
+void SysTick_Handler(void) {       // SyStick IRQ handler, triggered every 1ms
+  s_ticks++;
+}
+
+uint64_t mg_millis(void) {  // Let Mongoose use our uptime function
+  return s_ticks;           // Return number of milliseconds since boot
+}
+
+void mg_random(void *buf, size_t len) {  // Use on-board RNG
+  for (size_t n = 0; n < len; n += sizeof(uint32_t)) {
+    uint32_t r = rng_read();
+    memcpy((char *) buf + n, &r, n + sizeof(r) > len ? len - n : sizeof(r));
+  }
+}
+
+static void timer_fn(void *arg) {
+  struct mg_tcpip_if *ifp = arg;  // show network stats
+  const char *names[] = {"down", "up", "req", "ready"};
+  MG_INFO(("Ethernet: %s, IP: %M, rx:%u, tx:%u, dr:%u, er:%u",
+           names[ifp->state], mg_print_ip4, &ifp->ip, ifp->nrecv, ifp->nsent,
+           ifp->ndrop, ifp->nerr));
+}
+
+int main(void) {
+  gpio_input(BUTTON_PIN);
+  gpio_output(LED_PIN);
+  uart_init(UART_DEBUG, 115200);
+  ethernet_init();
+
+  MG_INFO(("Starting, CPU freq %g MHz", (double) clock_sys_freq() / 1000000));
+
+  struct mg_mgr mgr;        // Initialise
+  mg_mgr_init(&mgr);        // Mongoose event manager
+  mg_log_set(MG_LL_DEBUG);  // Set log level
+
+  // Initialise Mongoose network stack
+  struct mg_tcpip_driver_same54_data driver_data = {.mdc_cr = 5};
+  struct mg_tcpip_if mif = {.mac = GENERATE_LOCALLY_ADMINISTERED_MAC()/*{2, 3, 4, 5, 6, 7}*/,
+                            // Uncomment below for static configuration:
+                            // .ip = mg_htonl(MG_U32(192, 168, 0, 223)),
+                            // .mask = mg_htonl(MG_U32(255, 255, 255, 0)),
+                            // .gw = mg_htonl(MG_U32(192, 168, 0, 1)),
+                            .driver = &mg_tcpip_driver_same54,
+                            .driver_data = &driver_data};
+  mg_tcpip_init(&mgr, &mif);
+  mg_timer_add(&mgr, LOG_PERIOD_MS, MG_TIMER_REPEAT, timer_fn, &mif);
+
+  MG_INFO(("MAC: %M. Waiting for IP...", mg_print_mac, mif.mac));
+  while (mif.state != MG_TCPIP_STATE_READY) {
+    mg_mgr_poll(&mgr, 0);
+  }
+
+  MG_INFO(("Initialising application..."));
+  web_init(&mgr);
+
+  MG_INFO(("Starting event loop"));
+  for (;;) {
+    mg_mgr_poll(&mgr, 0);
+  }
+
+  return 0;
+}
diff --git a/examples/microchip/same54/mongoose.c b/examples/microchip/same54/mongoose.c
new file mode 120000
index 00000000..5e522bbc
--- /dev/null
+++ b/examples/microchip/same54/mongoose.c
@@ -0,0 +1 @@
+../../../mongoose.c
\ No newline at end of file
diff --git a/examples/microchip/same54/mongoose.h b/examples/microchip/same54/mongoose.h
new file mode 120000
index 00000000..ee4ac823
--- /dev/null
+++ b/examples/microchip/same54/mongoose.h
@@ -0,0 +1 @@
+../../../mongoose.h
\ No newline at end of file
diff --git a/examples/microchip/same54/net.c b/examples/microchip/same54/net.c
new file mode 120000
index 00000000..fe0e6f06
--- /dev/null
+++ b/examples/microchip/same54/net.c
@@ -0,0 +1 @@
+../../device-dashboard/net.c
\ No newline at end of file
diff --git a/examples/microchip/same54/net.h b/examples/microchip/same54/net.h
new file mode 120000
index 00000000..9de896ef
--- /dev/null
+++ b/examples/microchip/same54/net.h
@@ -0,0 +1 @@
+../../device-dashboard/net.h
\ No newline at end of file
diff --git a/examples/microchip/same54/packed_fs.c b/examples/microchip/same54/packed_fs.c
new file mode 120000
index 00000000..e06bf092
--- /dev/null
+++ b/examples/microchip/same54/packed_fs.c
@@ -0,0 +1 @@
+../../device-dashboard/packed_fs.c
\ No newline at end of file
diff --git a/examples/microchip/same54/startup.c b/examples/microchip/same54/startup.c
new file mode 100644
index 00000000..28ef30e2
--- /dev/null
+++ b/examples/microchip/same54/startup.c
@@ -0,0 +1,332 @@
+// SPDX-FileCopyrightText: 2022-2023 Cesanta Software Limited
+// SPDX-License-Identifier: MIT
+
+#include "hal.h"
+
+void Reset_Handler(void);    // Defined below
+void Dummy_Handler(void);    // Defined below
+void SysTick_Handler(void);  // Defined in main.c
+void SystemInit(void);       // Defined in main.c, called by reset handler
+void _estack(void);          // Defined in link.ld
+
+#define WEAK_ALIAS __attribute__((weak, alias("Default_Handler")))
+
+WEAK_ALIAS void NMI_Handler(void);
+WEAK_ALIAS void HardFault_Handler(void);
+WEAK_ALIAS void MemoryManagement_Handler(void);
+WEAK_ALIAS void BusFault_Handler(void);
+WEAK_ALIAS void UsageFault_Handler(void);
+WEAK_ALIAS void SVCall_Handler(void);
+WEAK_ALIAS void DebugMonitor_Handler(void);
+WEAK_ALIAS void PendSV_Handler(void);
+WEAK_ALIAS void SysTick_Handler(void);
+
+WEAK_ALIAS void PM_Handler(void);
+WEAK_ALIAS void MCLK_Handler(void);
+WEAK_ALIAS void OSCCTRL_XOSC0_Handler(void);
+WEAK_ALIAS void OSCCTRL_XOSC1_Handler(void);
+WEAK_ALIAS void OSCCTRL_DFLL_Handler(void);
+WEAK_ALIAS void OSCCTRL_DPLL0_Handler(void);
+WEAK_ALIAS void OSCCTRL_DPLL1_Handler(void);
+WEAK_ALIAS void OSC32KCTRL_Handler(void);
+WEAK_ALIAS void SUPC_OTHER_Handler(void);
+WEAK_ALIAS void SUPC_BODDET_Handler(void);
+WEAK_ALIAS void WDT_Handler(void);
+WEAK_ALIAS void RTC_Handler(void);
+WEAK_ALIAS void EIC_EXTINT_0_Handler(void);
+WEAK_ALIAS void EIC_EXTINT_1_Handler(void);
+WEAK_ALIAS void EIC_EXTINT_2_Handler(void);
+WEAK_ALIAS void EIC_EXTINT_3_Handler(void);
+WEAK_ALIAS void EIC_EXTINT_4_Handler(void);
+WEAK_ALIAS void EIC_EXTINT_5_Handler(void);
+WEAK_ALIAS void EIC_EXTINT_6_Handler(void);
+WEAK_ALIAS void EIC_EXTINT_7_Handler(void);
+WEAK_ALIAS void EIC_EXTINT_8_Handler(void);
+WEAK_ALIAS void EIC_EXTINT_9_Handler(void);
+WEAK_ALIAS void EIC_EXTINT_10_Handler(void);
+WEAK_ALIAS void EIC_EXTINT_11_Handler(void);
+WEAK_ALIAS void EIC_EXTINT_12_Handler(void);
+WEAK_ALIAS void EIC_EXTINT_13_Handler(void);
+WEAK_ALIAS void EIC_EXTINT_14_Handler(void);
+WEAK_ALIAS void EIC_EXTINT_15_Handler(void);
+WEAK_ALIAS void FREQM_Handler(void);
+WEAK_ALIAS void NVMCTRL_0_Handler(void);
+WEAK_ALIAS void NVMCTRL_1_Handler(void);
+WEAK_ALIAS void DMAC_0_Handler(void);
+WEAK_ALIAS void DMAC_1_Handler(void);
+WEAK_ALIAS void DMAC_2_Handler(void);
+WEAK_ALIAS void DMAC_3_Handler(void);
+WEAK_ALIAS void DMAC_OTHER_Handler(void);
+WEAK_ALIAS void EVSYS_0_Handler(void);
+WEAK_ALIAS void EVSYS_1_Handler(void);
+WEAK_ALIAS void EVSYS_2_Handler(void);
+WEAK_ALIAS void EVSYS_3_Handler(void);
+WEAK_ALIAS void EVSYS_OTHER_Handler(void);
+WEAK_ALIAS void PAC_Handler(void);
+WEAK_ALIAS void RAMECC_Handler(void);
+WEAK_ALIAS void SERCOM0_0_Handler(void);
+WEAK_ALIAS void SERCOM0_1_Handler(void);
+WEAK_ALIAS void SERCOM0_2_Handler(void);
+WEAK_ALIAS void SERCOM0_OTHER_Handler(void);
+WEAK_ALIAS void SERCOM1_0_Handler(void);
+WEAK_ALIAS void SERCOM1_1_Handler(void);
+WEAK_ALIAS void SERCOM1_2_Handler(void);
+WEAK_ALIAS void SERCOM1_OTHER_Handler(void);
+WEAK_ALIAS void SERCOM2_0_Handler(void);
+WEAK_ALIAS void SERCOM2_1_Handler(void);
+WEAK_ALIAS void SERCOM2_2_Handler(void);
+WEAK_ALIAS void SERCOM2_OTHER_Handler(void);
+WEAK_ALIAS void SERCOM3_0_Handler(void);
+WEAK_ALIAS void SERCOM3_1_Handler(void);
+WEAK_ALIAS void SERCOM3_2_Handler(void);
+WEAK_ALIAS void SERCOM3_OTHER_Handler(void);
+WEAK_ALIAS void SERCOM4_0_Handler(void);
+WEAK_ALIAS void SERCOM4_1_Handler(void);
+WEAK_ALIAS void SERCOM4_2_Handler(void);
+WEAK_ALIAS void SERCOM4_OTHER_Handler(void);
+WEAK_ALIAS void SERCOM5_0_Handler(void);
+WEAK_ALIAS void SERCOM5_1_Handler(void);
+WEAK_ALIAS void SERCOM5_2_Handler(void);
+WEAK_ALIAS void SERCOM5_OTHER_Handler(void);
+WEAK_ALIAS void SERCOM6_0_Handler(void);
+WEAK_ALIAS void SERCOM6_1_Handler(void);
+WEAK_ALIAS void SERCOM6_2_Handler(void);
+WEAK_ALIAS void SERCOM6_OTHER_Handler(void);
+WEAK_ALIAS void SERCOM7_0_Handler(void);
+WEAK_ALIAS void SERCOM7_1_Handler(void);
+WEAK_ALIAS void SERCOM7_2_Handler(void);
+WEAK_ALIAS void SERCOM7_OTHER_Handler(void);
+WEAK_ALIAS void CAN0_Handler(void);
+WEAK_ALIAS void CAN1_Handler(void);
+WEAK_ALIAS void USB_OTHER_Handler(void);
+WEAK_ALIAS void USB_SOF_HSOF_Handler(void);
+WEAK_ALIAS void USB_TRCPT0_Handler(void);
+WEAK_ALIAS void USB_TRCPT1_Handler(void);
+WEAK_ALIAS void GMAC_Handler(void);
+WEAK_ALIAS void TCC0_OTHER_Handler(void);
+WEAK_ALIAS void TCC0_MC0_Handler(void);
+WEAK_ALIAS void TCC0_MC1_Handler(void);
+WEAK_ALIAS void TCC0_MC2_Handler(void);
+WEAK_ALIAS void TCC0_MC3_Handler(void);
+WEAK_ALIAS void TCC0_MC4_Handler(void);
+WEAK_ALIAS void TCC0_MC5_Handler(void);
+WEAK_ALIAS void TCC1_OTHER_Handler(void);
+WEAK_ALIAS void TCC1_MC0_Handler(void);
+WEAK_ALIAS void TCC1_MC1_Handler(void);
+WEAK_ALIAS void TCC1_MC2_Handler(void);
+WEAK_ALIAS void TCC1_MC3_Handler(void);
+WEAK_ALIAS void TCC2_OTHER_Handler(void);
+WEAK_ALIAS void TCC2_MC0_Handler(void);
+WEAK_ALIAS void TCC2_MC1_Handler(void);
+WEAK_ALIAS void TCC2_MC2_Handler(void);
+WEAK_ALIAS void TCC3_OTHER_Handler(void);
+WEAK_ALIAS void TCC3_MC0_Handler(void);
+WEAK_ALIAS void TCC3_MC1_Handler(void);
+WEAK_ALIAS void TCC4_OTHER_Handler(void);
+WEAK_ALIAS void TCC4_MC0_Handler(void);
+WEAK_ALIAS void TCC4_MC1_Handler(void);
+WEAK_ALIAS void TC0_Handler(void);
+WEAK_ALIAS void TC1_Handler(void);
+WEAK_ALIAS void TC2_Handler(void);
+WEAK_ALIAS void TC3_Handler(void);
+WEAK_ALIAS void TC4_Handler(void);
+WEAK_ALIAS void TC5_Handler(void);
+WEAK_ALIAS void TC6_Handler(void);
+WEAK_ALIAS void TC7_Handler(void);
+WEAK_ALIAS void PDEC_OTHER_Handler(void);
+WEAK_ALIAS void PDEC_MC0_Handler(void);
+WEAK_ALIAS void PDEC_MC1_Handler(void);
+WEAK_ALIAS void ADC0_OTHER_Handler(void);
+WEAK_ALIAS void ADC0_RESRDY_Handler(void);
+WEAK_ALIAS void ADC1_OTHER_Handler(void);
+WEAK_ALIAS void ADC1_RESRDY_Handler(void);
+WEAK_ALIAS void AC_Handler(void);
+WEAK_ALIAS void DAC_OTHER_Handler(void);
+WEAK_ALIAS void DAC_EMPTY_0_Handler(void);
+WEAK_ALIAS void DAC_EMPTY_1_Handler(void);
+WEAK_ALIAS void DAC_RESRDY_0_Handler(void);
+WEAK_ALIAS void DAC_RESRDY_1_Handler(void);
+WEAK_ALIAS void I2S_Handler(void);
+WEAK_ALIAS void PCC_Handler(void);
+WEAK_ALIAS void AES_Handler(void);
+WEAK_ALIAS void TRNG_Handler(void);
+WEAK_ALIAS void ICM_Handler(void);
+WEAK_ALIAS void PUKCC_Handler(void);
+WEAK_ALIAS void QSPI_Handler(void);
+WEAK_ALIAS void SDHC0_Handler(void);
+WEAK_ALIAS void SDHC1_Handler(void);
+
+__attribute__((section(".vectors"))) void (*const tab[16 + 138])(void) = {
+    _estack,
+    Reset_Handler,
+    NMI_Handler,
+    HardFault_Handler,
+    MemoryManagement_Handler,
+    BusFault_Handler,
+    UsageFault_Handler,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    SVCall_Handler,
+    DebugMonitor_Handler,
+    NULL,
+    PendSV_Handler,
+    SysTick_Handler,
+    PM_Handler,  //  0 Power
+    MCLK_Handler,  //  1 Main
+    OSCCTRL_XOSC0_Handler,  //  2 Oscillators
+    OSCCTRL_XOSC1_Handler,  //  3 Oscillators
+    OSCCTRL_DFLL_Handler,  //  4 Oscillators
+    OSCCTRL_DPLL0_Handler,  //  5 Oscillators
+    OSCCTRL_DPLL1_Handler,  //  6 Oscillators
+    OSC32KCTRL_Handler,  //  7 32kHz
+    SUPC_OTHER_Handler,  //  8 Supply
+    SUPC_BODDET_Handler,  //  9 Supply
+    WDT_Handler,  //  10 Watchdog
+    RTC_Handler,  //  11 Real-Time
+    EIC_EXTINT_0_Handler,  //  12 External
+    EIC_EXTINT_1_Handler,  //  13 External
+    EIC_EXTINT_2_Handler,  //  14 External
+    EIC_EXTINT_3_Handler,  //  15 External
+    EIC_EXTINT_4_Handler,  //  16 External
+    EIC_EXTINT_5_Handler,  //  17 External
+    EIC_EXTINT_6_Handler,  //  18 External
+    EIC_EXTINT_7_Handler,  //  19 External
+    EIC_EXTINT_8_Handler,  //  20 External
+    EIC_EXTINT_9_Handler,  //  21 External
+    EIC_EXTINT_10_Handler,  //  22 External
+    EIC_EXTINT_11_Handler,  //  23 External
+    EIC_EXTINT_12_Handler,  //  24 External
+    EIC_EXTINT_13_Handler,  //  25 External
+    EIC_EXTINT_14_Handler,  //  26 External
+    EIC_EXTINT_15_Handler,  //  27 External
+    FREQM_Handler,  //  28 Frequency
+    NVMCTRL_0_Handler,  //  29 Non-Volatile
+    NVMCTRL_1_Handler,  //  30 Non-Volatile
+    DMAC_0_Handler,  //  31 Direct
+    DMAC_1_Handler,  //  32 Direct
+    DMAC_2_Handler,  //  33 Direct
+    DMAC_3_Handler,  //  34 Direct
+    DMAC_OTHER_Handler,  //  35 Direct
+    EVSYS_0_Handler,  //  36 Event
+    EVSYS_1_Handler,  //  37 Event
+    EVSYS_2_Handler,  //  38 Event
+    EVSYS_3_Handler,  //  39 Event
+    EVSYS_OTHER_Handler,  //  40 Event
+    PAC_Handler,  //  41 Peripheral
+    0,  //  42 Reserved
+    0,  //  43 Reserved
+    0,  //  44 Reserved
+    RAMECC_Handler,  //  45 RAM
+    SERCOM0_0_Handler,  //  46 Serial
+    SERCOM0_1_Handler,  //  47 Serial
+    SERCOM0_2_Handler,  //  48 Serial
+    SERCOM0_OTHER_Handler,  //  49 Serial
+    SERCOM1_0_Handler,  //  50 Serial
+    SERCOM1_1_Handler,  //  51 Serial
+    SERCOM1_2_Handler,  //  52 Serial
+    SERCOM1_OTHER_Handler,  //  53 Serial
+    SERCOM2_0_Handler,  //  54 Serial
+    SERCOM2_1_Handler,  //  55 Serial
+    SERCOM2_2_Handler,  //  56 Serial
+    SERCOM2_OTHER_Handler,  //  57 Serial
+    SERCOM3_0_Handler,  //  58 Serial
+    SERCOM3_1_Handler,  //  59 Serial
+    SERCOM3_2_Handler,  //  60 Serial
+    SERCOM3_OTHER_Handler,  //  61 Serial
+    SERCOM4_0_Handler,  //  62 Serial
+    SERCOM4_1_Handler,  //  63 Serial
+    SERCOM4_2_Handler,  //  64 Serial
+    SERCOM4_OTHER_Handler,  //  65 Serial
+    SERCOM5_0_Handler,  //  66 Serial
+    SERCOM5_1_Handler,  //  67 Serial
+    SERCOM5_2_Handler,  //  68 Serial
+    SERCOM5_OTHER_Handler,  //  69 Serial
+    SERCOM6_0_Handler,  //  70 Serial
+    SERCOM6_1_Handler,  //  71 Serial
+    SERCOM6_2_Handler,  //  72 Serial
+    SERCOM6_OTHER_Handler,  //  73 Serial
+    SERCOM7_0_Handler,  //  74 Serial
+    SERCOM7_1_Handler,  //  75 Serial
+    SERCOM7_2_Handler,  //  76 Serial
+    SERCOM7_OTHER_Handler,  //  77 Serial
+    CAN0_Handler,  //  78 Control
+    CAN1_Handler,  //  79 Control
+    USB_OTHER_Handler,  //  80 Universal
+    USB_SOF_HSOF_Handler,  //  81 Universal
+    USB_TRCPT0_Handler,  //  82 Universal
+    USB_TRCPT1_Handler,  //  83 Universal
+    GMAC_Handler,  //  84 Ethernet
+    TCC0_OTHER_Handler,  //  85 Timer
+    TCC0_MC0_Handler,  //  86 Timer
+    TCC0_MC1_Handler,  //  87 Timer
+    TCC0_MC2_Handler,  //  88 Timer
+    TCC0_MC3_Handler,  //  89 Timer
+    TCC0_MC4_Handler,  //  90 Timer
+    TCC0_MC5_Handler,  //  91 Timer
+    TCC1_OTHER_Handler,  //  92 Timer
+    TCC1_MC0_Handler,  //  93 Timer
+    TCC1_MC1_Handler,  //  94 Timer
+    TCC1_MC2_Handler,  //  95 Timer
+    TCC1_MC3_Handler,  //  96 Timer
+    TCC2_OTHER_Handler,  //  97 Timer
+    TCC2_MC0_Handler,  //  98 Timer
+    TCC2_MC1_Handler,  //  99 Timer
+    TCC2_MC2_Handler,  //  100 Timer
+    TCC3_OTHER_Handler,  //  101 Timer
+    TCC3_MC0_Handler,  //  102 Timer
+    TCC3_MC1_Handler,  //  103 Timer
+    TCC4_OTHER_Handler,  //  104 Timer
+    TCC4_MC0_Handler,  //  105 Timer
+    TCC4_MC1_Handler,  //  106 Timer
+    TC0_Handler,  //  107 Basic
+    TC1_Handler,  //  108 Basic
+    TC2_Handler,  //  109 Basic
+    TC3_Handler,  //  110 Basic
+    TC4_Handler,  //  111 Basic
+    TC5_Handler,  //  112 Basic
+    TC6_Handler,  //  113 Basic
+    TC7_Handler,  //  114 Basic
+    PDEC_OTHER_Handler,  //  115 Quadrature
+    PDEC_MC0_Handler,  //  116 Quadrature
+    PDEC_MC1_Handler,  //  117 Quadrature
+    ADC0_OTHER_Handler,  //  118 Analog
+    ADC0_RESRDY_Handler,  //  119 Analog
+    ADC1_OTHER_Handler,  //  120 Analog
+    ADC1_RESRDY_Handler,  //  121 Analog
+    AC_Handler,  //  122 Analog
+    DAC_OTHER_Handler,  //  123 Digital-to-Analog
+    DAC_EMPTY_0_Handler,  //  124 Digital-to-Analog
+    DAC_EMPTY_1_Handler,  //  125 Digital-to-Analog
+    DAC_RESRDY_0_Handler,  //  126 Digital-to-Analog
+    DAC_RESRDY_1_Handler,  //  127 Digital-to-Analog
+    I2S_Handler,  //  128 Inter-IC
+    PCC_Handler,  //  129 Parallel
+    AES_Handler,  //  130 Advanced
+    TRNG_Handler,  //  131 True
+    ICM_Handler,  //  132 Integrity
+    PUKCC_Handler,  //  133 PUblic-Key
+    QSPI_Handler,  //  134 Quad
+    SDHC0_Handler,  //  135 SD/MMC
+    SDHC1_Handler  //  136 SD/MMC
+};
+
+__attribute__((naked, noreturn)) void Reset_Handler(void) {
+  // Clear BSS section, and copy data section from flash to RAM
+  extern long _sbss, _ebss, _sdata, _edata, _sidata;
+  for (long *src = &_sbss; src < &_ebss; src++) *src = 0;
+  for (long *src = &_sdata, *dst = &_sidata; src < &_edata;) *src++ = *dst++;
+
+  SCB->VTOR = (uint32_t) &tab;
+  SystemInit();
+
+  // Call main()
+  extern void main(void);
+  main();
+  for (;;) (void) 0;  // Infinite loop
+}
+
+void Default_Handler(void) {
+  for (;;) (void) 0;
+}
diff --git a/examples/microchip/same54/syscalls.c b/examples/microchip/same54/syscalls.c
new file mode 100644
index 00000000..fbf0b74b
--- /dev/null
+++ b/examples/microchip/same54/syscalls.c
@@ -0,0 +1,89 @@
+// Copyright (c) 2022 Cesanta Software Limited
+// All rights reserved
+
+#include <sys/stat.h>
+
+#include "hal.h"
+
+int _fstat(int fd, struct stat *st) {
+  if (fd < 0) return -1;
+  st->st_mode = S_IFCHR;
+  return 0;
+}
+
+void *_sbrk(int incr) {
+  extern char _end;
+  static unsigned char *heap = NULL;
+  unsigned char *prev_heap;
+  if (heap == NULL) heap = (unsigned char *) &_end;
+  prev_heap = heap;
+  heap += incr;
+  return prev_heap;
+}
+
+int _open(const char *path) {
+  (void) path;
+  return -1;
+}
+
+int _close(int fd) {
+  (void) fd;
+  return -1;
+}
+
+int _isatty(int fd) {
+  (void) fd;
+  return 1;
+}
+
+int _lseek(int fd, int ptr, int dir) {
+  (void) fd, (void) ptr, (void) dir;
+  return 0;
+}
+
+void _exit(int status) {
+  (void) status;
+  for (;;) asm volatile("BKPT #0");
+}
+
+void _kill(int pid, int sig) {
+  (void) pid, (void) sig;
+}
+
+int _getpid(void) {
+  return -1;
+}
+
+int _write(int fd, char *ptr, int len) {
+  (void) fd, (void) ptr, (void) len;
+  if (fd == 1) uart_write_buf(UART_DEBUG, ptr, (size_t) len);
+  return -1;
+}
+
+int _read(int fd, char *ptr, int len) {
+  (void) fd, (void) ptr, (void) len;
+  return -1;
+}
+
+int _link(const char *a, const char *b) {
+  (void) a, (void) b;
+  return -1;
+}
+
+int _unlink(const char *a) {
+  (void) a;
+  return -1;
+}
+
+int _stat(const char *path, struct stat *st) {
+  (void) path, (void) st;
+  return -1;
+}
+
+int mkdir(const char *path, mode_t mode) {
+  (void) path, (void) mode;
+  return -1;
+}
+
+void _init(void) {
+}
diff --git a/mongoose.c b/mongoose.c
index c33171cc..2801a185 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -3616,7 +3616,7 @@ static bool mg_v4mapped(struct mg_str str, struct mg_addr *addr) {
   for (i = 2; i < 6; i++) {
     if (str.ptr[i] != 'f' && str.ptr[i] != 'F') return false;
   }
-  //struct mg_str s = mg_str_n(&str.ptr[7], str.len - 7);
+  // struct mg_str s = mg_str_n(&str.ptr[7], str.len - 7);
   if (!mg_aton4(mg_str_n(&str.ptr[7], str.len - 7), addr)) return false;
   memcpy(&ipv4, addr->ip, sizeof(ipv4));
   memset(addr->ip, 0, sizeof(addr->ip));
@@ -3659,7 +3659,7 @@ static bool mg_aton6(struct mg_str str, struct mg_addr *addr) {
     memmove(&addr->ip[dc + (14 - n)], &addr->ip[dc], n - dc + 2);
     memset(&addr->ip[dc], 0, 14 - n);
   }
-  
+
   addr->is_ip6 = true;
   return true;
 }
@@ -3713,7 +3713,7 @@ struct mg_connection *mg_connect(struct mg_mgr *mgr, const char *url,
     c->is_client = true;
     c->fn_data = fn_data;
     MG_DEBUG(("%lu %p %s", c->id, c->fd, url));
-    mg_call(c, MG_EV_OPEN, NULL);
+    mg_call(c, MG_EV_OPEN, (void *) url);
     mg_resolve(c, url);
     if (mg_url_is_ssl(url)) {
       struct mg_str host = mg_url_host(url);
@@ -5494,6 +5494,175 @@ void mg_timer_poll(struct mg_timer **head, uint64_t now_ms) {
   }
 }
 
+#ifdef MG_ENABLE_LINES
+#line 1 "src/tls_builtin.c"
+#endif
+
+
+#if MG_TLS == MG_TLS_BUILTIN
+struct tls_data {
+  struct mg_iobuf send;
+  struct mg_iobuf recv;
+};
+
+#define MG_LOAD_BE16(p) ((uint16_t) ((MG_U8P(p)[0] << 8U) | MG_U8P(p)[1]))
+#define TLS_HDR_SIZE 5  // 1 byte type, 2 bytes version, 2 bytes len
+
+static inline bool mg_is_big_endian(void) {
+  int v = 1;
+  return *(unsigned char *) &v == 1;
+}
+static inline uint16_t mg_swap16(uint16_t v) {
+  return (uint16_t) ((v << 8U) | (v >> 8U));
+}
+static inline uint32_t mg_swap32(uint32_t v) {
+  return (v >> 24) | (v >> 8 & 0xff00) | (v << 8 & 0xff0000) | (v << 24);
+}
+static inline uint64_t mg_swap64(uint64_t v) {
+  return (((uint64_t) mg_swap32((uint32_t) v)) << 32) |
+         mg_swap32((uint32_t) (v >> 32));
+}
+static inline uint16_t mg_be16(uint16_t v) {
+  return mg_is_big_endian() ? mg_swap16(v) : v;
+}
+static inline uint32_t mg_be32(uint32_t v) {
+  return mg_is_big_endian() ? mg_swap32(v) : v;
+}
+
+static inline void add8(struct mg_iobuf *io, uint8_t data) {
+  mg_iobuf_add(io, io->len, &data, sizeof(data));
+}
+static inline void add16(struct mg_iobuf *io, uint16_t data) {
+  data = mg_htons(data);
+  mg_iobuf_add(io, io->len, &data, sizeof(data));
+}
+static inline void add32(struct mg_iobuf *io, uint32_t data) {
+  data = mg_htonl(data);
+  mg_iobuf_add(io, io->len, &data, sizeof(data));
+}
+
+void mg_tls_init(struct mg_connection *c, struct mg_str hostname) {
+  struct tls_data *tls = (struct tls_data *) calloc(1, sizeof(struct tls_data));
+  if (tls != NULL) {
+    tls->send.align = tls->recv.align = MG_IO_SIZE;
+    c->tls = tls;
+    c->is_tls = c->is_tls_hs = 1;
+  } else {
+    mg_error(c, "tls oom");
+  }
+  (void) hostname;
+}
+void mg_tls_free(struct mg_connection *c) {
+  struct tls_data *tls = c->tls;
+  if (tls != NULL) {
+    mg_iobuf_free(&tls->send);
+    mg_iobuf_free(&tls->recv);
+  }
+  free(c->tls);
+  c->tls = NULL;
+}
+long mg_tls_send(struct mg_connection *c, const void *buf, size_t len) {
+  (void) c, (void) buf, (void) len;
+  // MG_INFO(("BBBBBBBB"));
+  return -1;
+}
+long mg_tls_recv(struct mg_connection *c, void *buf, size_t len) {
+  (void) c, (void) buf, (void) len;
+  char tmp[8192];
+  long n = mg_io_recv(c, tmp, sizeof(tmp));
+  if (n > 0) mg_hexdump(tmp, (size_t) n);
+  MG_INFO(("AAAAAAAA"));
+  return -1;
+  // struct mg_tls *tls = (struct mg_tls *) c->tls;
+  // long n = mbedtls_ssl_read(&tls->ssl, (unsigned char *) buf, len);
+  // if (n == MBEDTLS_ERR_SSL_WANT_READ || n == MBEDTLS_ERR_SSL_WANT_WRITE)
+  //   return MG_IO_WAIT;
+  // if (n <= 0) return MG_IO_ERR;
+  // return n;
+}
+size_t mg_tls_pending(struct mg_connection *c) {
+  (void) c;
+  return 0;
+}
+void mg_tls_handshake(struct mg_connection *c) {
+  struct tls_data *tls = c->tls;
+  struct mg_iobuf *rio = &tls->recv;
+  struct mg_iobuf *wio = &tls->send;
+  // Pull data from TCP
+  for (;;) {
+    mg_iobuf_resize(rio, rio->len + 1);
+    long n = mg_io_recv(c, &rio->buf[rio->len], rio->size - rio->len);
+    if (n > 0) {
+      rio->len += (size_t) n;
+    } else if (n == MG_IO_WAIT) {
+      break;
+    } else {
+      mg_error(c, "IO err");
+      return;
+    }
+  }
+  // Look if we've pulled everything
+  if (rio->len < TLS_HDR_SIZE) return;
+  uint8_t record_type = rio->buf[0];
+  uint16_t record_len = MG_LOAD_BE16(rio->buf + 3);
+  uint16_t record_version = MG_LOAD_BE16(rio->buf + 1);
+  if (record_type != 22) {
+    mg_error(c, "no 22");
+    return;
+  }
+  if (rio->len < (size_t) TLS_HDR_SIZE + record_len) return;
+  // Got full hello
+  // struct tls_hello *hello = (struct tls_hello *) (hdr + 1);
+  MG_INFO(("CT=%d V=%hx L=%hu", record_type, record_version, record_len));
+  mg_hexdump(rio->buf, rio->len);
+
+  // Send response. Server Hello
+  size_t ofs = wio->len;
+  add8(wio, 22), add16(wio, 0x303), add16(wio, 0);  // Layer: type, ver, len
+  add8(wio, 2), add8(wio, 0), add16(wio, 0), add16(wio, 0x304);  // Hello
+  mg_iobuf_add(wio, wio->len, NULL, 32);                         // 32 random
+  mg_random(wio->buf + wio->len - 32, 32);                       // bytes
+  add8(wio, 0);                                                  // Session ID
+  add16(wio, 0x1301);  // Cipher: TLS_AES_128_GCM_SHA256
+  add8(wio, 0);        // Compression method: 0
+  add16(wio, 46);      // Extensions length
+  add16(wio, 43), add16(wio, 2), add16(wio, 0x304);  // extension: TLS 1.3
+  add16(wio, 51), add16(wio, 36), add16(wio, 29), add16(wio, 32);  // keyshare
+  mg_iobuf_add(wio, wio->len, NULL, 32);                           // 32 random
+  mg_random(wio->buf + wio->len - 32, 32);                         // bytes
+  *(uint16_t *) &wio->buf[ofs + 3] = mg_be16((uint16_t) (wio->len - ofs - 5));
+  *(uint16_t *) &wio->buf[ofs + 7] = mg_be16((uint16_t) (wio->len - ofs - 9));
+
+  // Change cipher. Cipher's payload is an encypted app data
+  // ofs = wio->len;
+  add8(wio, 20), add16(wio, 0x303);  // Layer: type, version
+  add16(wio, 1), add8(wio, 1);
+
+  ofs = wio->len;                                   // Application data
+  add8(wio, 23), add16(wio, 0x303), add16(wio, 5);  // Layer: type, version
+  // mg_iobuf_add(wio, wio->len, "\x01\x02\x03\x04\x05", 5);
+  add8(wio, 22);                                       // handshake message
+  add8(wio, 8);                                        // encrypted extensions
+  add8(wio, 0), add16(wio, 2), add16(wio, 0);          // empty 2 bytes
+  add8(wio, 11);                                       // certificate message
+  add8(wio, 0), add16(wio, 4), add32(wio, 0x1020304);  // len
+  *(uint16_t *) &wio->buf[ofs + 3] = mg_be16((uint16_t)(wio->len - ofs - 5));
+
+  mg_io_send(c, wio->buf, wio->len);
+  wio->len = 0;
+
+  rio->len = 0;
+  c->is_tls_hs = 0;
+  mg_error(c, "doh");
+}
+void mg_tls_ctx_free(struct mg_mgr *mgr) {
+  mgr->tls_ctx = NULL;
+}
+void mg_tls_ctx_init(struct mg_mgr *mgr, const struct mg_tls_opts *opts) {
+  (void) opts, (void) mgr;
+}
+#endif
+
 #ifdef MG_ENABLE_LINES
 #line 1 "src/tls_dummy.c"
 #endif
@@ -6858,6 +7027,224 @@ struct mg_tcpip_driver mg_tcpip_driver_imxrt1020 = {
 
 #endif
 
+#ifdef MG_ENABLE_LINES
+#line 1 "src/tcpip/driver_same54.c"
+#endif
+
+
+#if MG_ENABLE_TCPIP && defined(MG_ENABLE_DRIVER_SAME54) && \
+    MG_ENABLE_DRIVER_SAME54
+
+#include <sam.h>
+
+#undef BIT
+#define BIT(x) ((uint32_t) 1 << (x))
+#define ETH_PKT_SIZE 1536  // Max frame size
+#define ETH_DESC_CNT 4     // Descriptors count
+#define ETH_DS 2           // Descriptor size (words)
+
+static uint8_t s_rxbuf[ETH_DESC_CNT][ETH_PKT_SIZE];
+static uint8_t s_txbuf[ETH_DESC_CNT][ETH_PKT_SIZE];
+static uint32_t s_rxdesc[ETH_DESC_CNT][ETH_DS];  // RX descriptors
+static uint32_t s_txdesc[ETH_DESC_CNT][ETH_DS];  // TX descriptors
+static uint8_t s_txno;                           // Current TX descriptor
+static uint8_t s_rxno;                           // Current RX descriptor
+
+static struct mg_tcpip_if *s_ifp;  // MIP interface
+enum { PHY_ADDR = 0, PHY_BCR = 0, PHY_BSR = 1 };
+
+#define PHY_BCR_DUPLEX_MODE_Msk BIT(8)
+#define PHY_BCR_SPEED_Msk BIT(13)
+#define PHY_BSR_LINK_STATUS_Msk BIT(2)
+
+static uint16_t eth_read_phy(uint8_t addr, uint8_t reg) {
+  GMAC_REGS->GMAC_MAN = GMAC_MAN_CLTTO_Msk |
+                        GMAC_MAN_OP(2) |  // Setting the read operation
+                        GMAC_MAN_WTN(2) | GMAC_MAN_PHYA(addr) |  // PHY address
+                        GMAC_MAN_REGA(reg);  // Setting the register
+  while (!(GMAC_REGS->GMAC_NSR & GMAC_NSR_IDLE_Msk)) (void) 0;
+  return GMAC_REGS->GMAC_MAN & GMAC_MAN_DATA_Msk;  // Getting the read value
+}
+
+#if 0
+static void eth_write_phy(uint8_t addr, uint8_t reg, uint16_t val) {
+  GMAC_REGS->GMAC_MAN = GMAC_MAN_CLTTO_Msk | GMAC_MAN_OP(1) |   // Setting the write operation
+                        GMAC_MAN_WTN(2) | GMAC_MAN_PHYA(addr) | // PHY address
+                        GMAC_MAN_REGA(reg) | GMAC_MAN_DATA(val);  // Setting the register
+  while (!(GMAC_REGS->GMAC_NSR & GMAC_NSR_IDLE_Msk)); // Waiting until the write op is complete
+}
+#endif
+
+int get_clock_rate(struct mg_tcpip_driver_same54_data *d) {
+  if (d && d->mdc_cr >= 0 && d->mdc_cr <= 5) {
+    return d->mdc_cr;
+  } else {
+    // get MCLK from GCLK_GENERATOR 0
+    uint32_t div = 512;
+    uint32_t mclk;
+    if (!(GCLK_REGS->GCLK_GENCTRL[0] & GCLK_GENCTRL_DIVSEL_Msk)) {
+      div = ((GCLK_REGS->GCLK_GENCTRL[0] & 0x00FF0000) >> 16);
+      if (div == 0) div = 1;
+    }
+    switch (GCLK_REGS->GCLK_GENCTRL[0] & GCLK_GENCTRL_SRC_Msk) {
+      case GCLK_GENCTRL_SRC_XOSC0_Val:
+        mclk = 32000000UL; /* 32MHz */
+        break;
+      case GCLK_GENCTRL_SRC_XOSC1_Val:
+        mclk = 32000000UL; /* 32MHz */
+        break;
+      case GCLK_GENCTRL_SRC_OSCULP32K_Val:
+        mclk = 32000UL;
+        break;
+      case GCLK_GENCTRL_SRC_XOSC32K_Val:
+        mclk = 32000UL;
+        break;
+      case GCLK_GENCTRL_SRC_DFLL_Val:
+        mclk = 48000000UL; /* 48MHz */
+        break;
+      case GCLK_GENCTRL_SRC_DPLL0_Val:
+        mclk = 200000000UL; /* 200MHz */
+        break;
+      case GCLK_GENCTRL_SRC_DPLL1_Val:
+        mclk = 200000000UL; /* 200MHz */
+        break;
+      default:
+        mclk = 200000000UL; /* 200MHz */
+    }
+
+    mclk /= div;
+    uint8_t crs[] = {0, 1, 2, 3, 4, 5};          // GMAC->NCFGR::CLK values
+    uint8_t dividers[] = {8, 16, 32, 48, 64, 128};  // Respective CLK dividers
+    for (int i = 0; i < 6; i++) {
+      if (mclk / dividers[i] <= 2375000UL /* 2.5MHz - 5% */) {
+        return crs[i];
+      }
+    }
+
+    return 5;
+  }
+}
+
+static bool mg_tcpip_driver_same54_init(struct mg_tcpip_if *ifp) {
+  struct mg_tcpip_driver_same54_data *d =
+      (struct mg_tcpip_driver_same54_data *) ifp->driver_data;
+  s_ifp = ifp;
+
+  MCLK_REGS->MCLK_APBCMASK |= MCLK_APBCMASK_GMAC_Msk;
+  MCLK_REGS->MCLK_AHBMASK |= MCLK_AHBMASK_GMAC_Msk;
+  GMAC_REGS->GMAC_NCFGR = GMAC_NCFGR_CLK(get_clock_rate(d));  // Set MDC divider
+  GMAC_REGS->GMAC_NCR = 0;                            // Disable RX & TX
+  GMAC_REGS->GMAC_NCR |= GMAC_NCR_MPE_Msk;            // Enable MDC & MDIO
+
+  for (int i = 0; i < ETH_DESC_CNT; i++) {   // Init TX descriptors
+    s_txdesc[i][0] = (uint32_t) s_txbuf[i];  // Point to data buffer
+    s_txdesc[i][1] = BIT(31);                // OWN bit
+  }
+  s_txdesc[ETH_DESC_CNT - 1][1] |= BIT(30);  // Last tx descriptor - wrap
+
+  GMAC_REGS->GMAC_DCFGR = GMAC_DCFGR_DRBS(0x18);  // DMA recv buf 1536
+  for (int i = 0; i < ETH_DESC_CNT; i++) {        // Init RX descriptors
+    s_rxdesc[i][0] = (uint32_t) s_rxbuf[i];       // Address of the data buffer
+    s_rxdesc[i][1] = 0;                           // Clear status
+  }
+  s_rxdesc[ETH_DESC_CNT - 1][0] |= BIT(1);  // Last rx descriptor - wrap
+
+  GMAC_REGS->GMAC_TBQB = (uint32_t) s_txdesc;  // about the descriptor addresses
+  GMAC_REGS->GMAC_RBQB = (uint32_t) s_rxdesc;  // Let the controller know
+
+  GMAC_REGS->SA[0].GMAC_SAB =
+      MG_U32(ifp->mac[3], ifp->mac[2], ifp->mac[1], ifp->mac[0]);
+  GMAC_REGS->SA[0].GMAC_SAT = MG_U32(0, 0, ifp->mac[5], ifp->mac[4]);
+
+  GMAC_REGS->GMAC_UR &= ~GMAC_UR_MII_Msk;  // Disable MII, use RMII
+  GMAC_REGS->GMAC_NCFGR |= GMAC_NCFGR_MAXFS_Msk | GMAC_NCFGR_MTIHEN_Msk |
+                           GMAC_NCFGR_EFRHD_Msk | GMAC_NCFGR_CAF_Msk;
+  GMAC_REGS->GMAC_TSR = GMAC_TSR_HRESP_Msk | GMAC_TSR_UND_Msk |
+                        GMAC_TSR_TXCOMP_Msk | GMAC_TSR_TFC_Msk |
+                        GMAC_TSR_TXGO_Msk | GMAC_TSR_RLE_Msk |
+                        GMAC_TSR_COL_Msk | GMAC_TSR_UBR_Msk;
+  GMAC_REGS->GMAC_RSR = GMAC_RSR_HNO_Msk | GMAC_RSR_RXOVR_Msk |
+                        GMAC_RSR_REC_Msk | GMAC_RSR_BNA_Msk;
+  GMAC_REGS->GMAC_IDR = ~0U;  // Disable interrupts, then enable required
+  GMAC_REGS->GMAC_IER = GMAC_IER_HRESP_Msk | GMAC_IER_ROVR_Msk |
+                        GMAC_IER_TCOMP_Msk | GMAC_IER_TFC_Msk |
+                        GMAC_IER_RLEX_Msk | GMAC_IER_TUR_Msk |
+                        GMAC_IER_RXUBR_Msk | GMAC_IER_RCOMP_Msk;
+  GMAC_REGS->GMAC_NCR |= GMAC_NCR_TXEN_Msk | GMAC_NCR_RXEN_Msk;
+  NVIC_EnableIRQ(GMAC_IRQn);
+
+  return true;
+}
+
+static size_t mg_tcpip_driver_same54_tx(const void *buf, size_t len,
+                                        struct mg_tcpip_if *ifp) {
+  if (len > sizeof(s_txbuf[s_txno])) {
+    MG_ERROR(("Frame too big, %ld", (long) len));
+    len = 0;  // Frame is too big
+  } else if ((s_txdesc[s_txno][1] & BIT(31)) == 0) {
+    ifp->nerr++;
+    MG_ERROR(("No free descriptors"));
+    len = 0;  // All descriptors are busy, fail
+  } else {
+    uint32_t status = len | BIT(15);  // Frame length, last chunk
+    if (s_txno == ETH_DESC_CNT - 1) status |= BIT(30);  // wrap
+    memcpy(s_txbuf[s_txno], buf, len);                  // Copy data
+    s_txdesc[s_txno][1] = status;
+    if (++s_txno >= ETH_DESC_CNT) s_txno = 0;
+  }
+  __DSB();  // Ensure descriptors have been written
+  GMAC_REGS->GMAC_NCR |= GMAC_NCR_TSTART_Msk;  // Enable transmission
+  return len;
+}
+
+static bool mg_tcpip_driver_same54_up(struct mg_tcpip_if *ifp) {
+  uint16_t bsr = eth_read_phy(PHY_ADDR, PHY_BSR);
+  bool up = bsr & PHY_BSR_LINK_STATUS_Msk ? 1 : 0;
+
+  // If PHY is ready, update NCFGR accordingly
+  if (ifp->state == MG_TCPIP_STATE_DOWN && up) {
+    uint16_t bcr = eth_read_phy(PHY_ADDR, PHY_BCR);
+    bool fd = bcr & PHY_BCR_DUPLEX_MODE_Msk ? 1 : 0;
+    bool spd = bcr & PHY_BCR_SPEED_Msk ? 1 : 0;
+    GMAC_REGS->GMAC_NCFGR |= GMAC_NCFGR_SPD(spd) | GMAC_NCFGR_FD(fd);
+  }
+
+  return up;
+}
+
+void GMAC_Handler(void);
+void GMAC_Handler(void) {
+  uint32_t isr = GMAC_REGS->GMAC_ISR;
+  uint32_t rsr = GMAC_REGS->GMAC_RSR;
+  uint32_t tsr = GMAC_REGS->GMAC_TSR;
+  if (isr & GMAC_ISR_RCOMP_Msk) {
+    if (rsr & GMAC_ISR_RCOMP_Msk) {
+      for (uint8_t i = 0; i < ETH_DESC_CNT; i++) {
+        if ((s_rxdesc[s_rxno][0] & BIT(0)) == 0) break;
+        size_t len = s_rxdesc[s_rxno][1] & (BIT(13) - 1);
+        mg_tcpip_qwrite(s_rxbuf[s_rxno], len, s_ifp);
+        s_rxdesc[s_rxno][0] &= ~BIT(0);  // Disown
+        if (++s_rxno >= ETH_DESC_CNT) s_rxno = 0;
+      }
+    }
+  }
+
+  if ((tsr & (GMAC_TSR_HRESP_Msk | GMAC_TSR_UND_Msk | GMAC_TSR_TXCOMP_Msk |
+              GMAC_TSR_TFC_Msk | GMAC_TSR_TXGO_Msk | GMAC_TSR_RLE_Msk |
+              GMAC_TSR_COL_Msk | GMAC_TSR_UBR_Msk)) != 0) {
+    // MG_INFO((" --> %#x %#x", s_txdesc[s_txno][1], tsr));
+    if (!(s_txdesc[s_txno][1] & BIT(31))) s_txdesc[s_txno][1] |= BIT(31);
+  }
+
+  GMAC_REGS->GMAC_RSR = rsr;
+  GMAC_REGS->GMAC_TSR = tsr;
+}
+
+struct mg_tcpip_driver mg_tcpip_driver_same54 = {
+    mg_tcpip_driver_same54_init, mg_tcpip_driver_same54_tx, NULL,
+    mg_tcpip_driver_same54_up};
+#endif
+
 #ifdef MG_ENABLE_LINES
 #line 1 "src/tcpip/driver_stm32.c"
 #endif
@@ -8485,6 +8872,7 @@ static void mg_tcpip_rx(struct mg_tcpip_if *ifp, void *buf, size_t len) {
   pkt.raw.ptr = (char *) buf;
   pkt.raw.len = len;
   pkt.eth = (struct eth *) buf;
+  //mg_hexdump(buf, len > 16 ? 16: len);
   if (pkt.raw.len < sizeof(*pkt.eth)) return;  // Truncated - runt?
   if (ifp->enable_mac_check &&
       memcmp(pkt.eth->dst, ifp->mac, sizeof(pkt.eth->dst)) != 0 &&
@@ -8517,8 +8905,8 @@ static void mg_tcpip_rx(struct mg_tcpip_if *ifp, void *buf, size_t len) {
     mkpay(&pkt, pkt.ip + 1);
     rx_ip(ifp, &pkt);
   } else {
-    MG_DEBUG(("  Unknown eth type %x", mg_htons(pkt.eth->type)));
-    mg_hexdump(buf, len >= 16 ? 16 : len);
+    MG_DEBUG(("Unknown eth type %x", mg_htons(pkt.eth->type)));
+    mg_hexdump(buf, len >= 32 ? 32 : len);
   }
 }
 
diff --git a/mongoose.h b/mongoose.h
index 29e6f077..2ad6f32c 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -1696,6 +1696,7 @@ extern struct mg_tcpip_driver mg_tcpip_driver_w5500;
 extern struct mg_tcpip_driver mg_tcpip_driver_tm4c;
 extern struct mg_tcpip_driver mg_tcpip_driver_stm32h;
 extern struct mg_tcpip_driver mg_tcpip_driver_imxrt;
+extern struct mg_tcpip_driver mg_tcpip_driver_same54;
 
 // Drivers that require SPI, can use this SPI abstraction
 struct mg_tcpip_spi {
@@ -1722,6 +1723,15 @@ struct mg_tcpip_driver_imxrt1020_data {
 };
 
 
+#if MG_ENABLE_TCPIP && defined(MG_ENABLE_DRIVER_SAME54) && MG_ENABLE_DRIVER_SAME54
+
+struct mg_tcpip_driver_same54_data {
+    int mdc_cr;
+};
+
+#endif
+
+
 struct mg_tcpip_driver_stm32_data {
   // MDC clock divider. MDC clock is derived from HCLK, must not exceed 2.5MHz
   //    HCLK range    DIVIDER    mdc_cr VALUE
diff --git a/src/net.c b/src/net.c
index 6c7d4b5f..45b60904 100644
--- a/src/net.c
+++ b/src/net.c
@@ -65,7 +65,7 @@ static bool mg_v4mapped(struct mg_str str, struct mg_addr *addr) {
   for (i = 2; i < 6; i++) {
     if (str.ptr[i] != 'f' && str.ptr[i] != 'F') return false;
   }
-  //struct mg_str s = mg_str_n(&str.ptr[7], str.len - 7);
+  // struct mg_str s = mg_str_n(&str.ptr[7], str.len - 7);
   if (!mg_aton4(mg_str_n(&str.ptr[7], str.len - 7), addr)) return false;
   memcpy(&ipv4, addr->ip, sizeof(ipv4));
   memset(addr->ip, 0, sizeof(addr->ip));
@@ -108,7 +108,7 @@ static bool mg_aton6(struct mg_str str, struct mg_addr *addr) {
     memmove(&addr->ip[dc + (14 - n)], &addr->ip[dc], n - dc + 2);
     memset(&addr->ip[dc], 0, 14 - n);
   }
-  
+
   addr->is_ip6 = true;
   return true;
 }
@@ -162,7 +162,7 @@ struct mg_connection *mg_connect(struct mg_mgr *mgr, const char *url,
     c->is_client = true;
     c->fn_data = fn_data;
     MG_DEBUG(("%lu %p %s", c->id, c->fd, url));
-    mg_call(c, MG_EV_OPEN, NULL);
+    mg_call(c, MG_EV_OPEN, (void *) url);
     mg_resolve(c, url);
     if (mg_url_is_ssl(url)) {
       struct mg_str host = mg_url_host(url);
diff --git a/src/tcpip/driver_same54.c b/src/tcpip/driver_same54.c
new file mode 100644
index 00000000..59ee7eb6
--- /dev/null
+++ b/src/tcpip/driver_same54.c
@@ -0,0 +1,214 @@
+#include "tcpip.h"
+
+#if MG_ENABLE_TCPIP && defined(MG_ENABLE_DRIVER_SAME54) && \
+    MG_ENABLE_DRIVER_SAME54
+
+#include <sam.h>
+
+#undef BIT
+#define BIT(x) ((uint32_t) 1 << (x))
+#define ETH_PKT_SIZE 1536  // Max frame size
+#define ETH_DESC_CNT 4     // Descriptors count
+#define ETH_DS 2           // Descriptor size (words)
+
+static uint8_t s_rxbuf[ETH_DESC_CNT][ETH_PKT_SIZE];
+static uint8_t s_txbuf[ETH_DESC_CNT][ETH_PKT_SIZE];
+static uint32_t s_rxdesc[ETH_DESC_CNT][ETH_DS];  // RX descriptors
+static uint32_t s_txdesc[ETH_DESC_CNT][ETH_DS];  // TX descriptors
+static uint8_t s_txno;                           // Current TX descriptor
+static uint8_t s_rxno;                           // Current RX descriptor
+
+static struct mg_tcpip_if *s_ifp;  // MIP interface
+enum { PHY_ADDR = 0, PHY_BCR = 0, PHY_BSR = 1 };
+
+#define PHY_BCR_DUPLEX_MODE_Msk BIT(8)
+#define PHY_BCR_SPEED_Msk BIT(13)
+#define PHY_BSR_LINK_STATUS_Msk BIT(2)
+
+static uint16_t eth_read_phy(uint8_t addr, uint8_t reg) {
+  GMAC_REGS->GMAC_MAN = GMAC_MAN_CLTTO_Msk |
+                        GMAC_MAN_OP(2) |  // Setting the read operation
+                        GMAC_MAN_WTN(2) | GMAC_MAN_PHYA(addr) |  // PHY address
+                        GMAC_MAN_REGA(reg);  // Setting the register
+  while (!(GMAC_REGS->GMAC_NSR & GMAC_NSR_IDLE_Msk)) (void) 0;
+  return GMAC_REGS->GMAC_MAN & GMAC_MAN_DATA_Msk;  // Getting the read value
+}
+
+#if 0
+static void eth_write_phy(uint8_t addr, uint8_t reg, uint16_t val) {
+  GMAC_REGS->GMAC_MAN = GMAC_MAN_CLTTO_Msk | GMAC_MAN_OP(1) |   // Setting the write operation
+                        GMAC_MAN_WTN(2) | GMAC_MAN_PHYA(addr) | // PHY address
+                        GMAC_MAN_REGA(reg) | GMAC_MAN_DATA(val);  // Setting the register
+  while (!(GMAC_REGS->GMAC_NSR & GMAC_NSR_IDLE_Msk)); // Waiting until the write op is complete
+}
+#endif
+
+int get_clock_rate(struct mg_tcpip_driver_same54_data *d) {
+  if (d && d->mdc_cr >= 0 && d->mdc_cr <= 5) {
+    return d->mdc_cr;
+  } else {
+    // get MCLK from GCLK_GENERATOR 0
+    uint32_t div = 512;
+    uint32_t mclk;
+    if (!(GCLK_REGS->GCLK_GENCTRL[0] & GCLK_GENCTRL_DIVSEL_Msk)) {
+      div = ((GCLK_REGS->GCLK_GENCTRL[0] & 0x00FF0000) >> 16);
+      if (div == 0) div = 1;
+    }
+    switch (GCLK_REGS->GCLK_GENCTRL[0] & GCLK_GENCTRL_SRC_Msk) {
+      case GCLK_GENCTRL_SRC_XOSC0_Val:
+        mclk = 32000000UL; /* 32MHz */
+        break;
+      case GCLK_GENCTRL_SRC_XOSC1_Val:
+        mclk = 32000000UL; /* 32MHz */
+        break;
+      case GCLK_GENCTRL_SRC_OSCULP32K_Val:
+        mclk = 32000UL;
+        break;
+      case GCLK_GENCTRL_SRC_XOSC32K_Val:
+        mclk = 32000UL;
+        break;
+      case GCLK_GENCTRL_SRC_DFLL_Val:
+        mclk = 48000000UL; /* 48MHz */
+        break;
+      case GCLK_GENCTRL_SRC_DPLL0_Val:
+        mclk = 200000000UL; /* 200MHz */
+        break;
+      case GCLK_GENCTRL_SRC_DPLL1_Val:
+        mclk = 200000000UL; /* 200MHz */
+        break;
+      default:
+        mclk = 200000000UL; /* 200MHz */
+    }
+
+    mclk /= div;
+    uint8_t crs[] = {0, 1, 2, 3, 4, 5};          // GMAC->NCFGR::CLK values
+    uint8_t dividers[] = {8, 16, 32, 48, 64, 128};  // Respective CLK dividers
+    for (int i = 0; i < 6; i++) {
+      if (mclk / dividers[i] <= 2375000UL /* 2.5MHz - 5% */) {
+        return crs[i];
+      }
+    }
+
+    return 5;
+  }
+}
+
+static bool mg_tcpip_driver_same54_init(struct mg_tcpip_if *ifp) {
+  struct mg_tcpip_driver_same54_data *d =
+      (struct mg_tcpip_driver_same54_data *) ifp->driver_data;
+  s_ifp = ifp;
+
+  MCLK_REGS->MCLK_APBCMASK |= MCLK_APBCMASK_GMAC_Msk;
+  MCLK_REGS->MCLK_AHBMASK |= MCLK_AHBMASK_GMAC_Msk;
+  GMAC_REGS->GMAC_NCFGR = GMAC_NCFGR_CLK(get_clock_rate(d));  // Set MDC divider
+  GMAC_REGS->GMAC_NCR = 0;                            // Disable RX & TX
+  GMAC_REGS->GMAC_NCR |= GMAC_NCR_MPE_Msk;            // Enable MDC & MDIO
+
+  for (int i = 0; i < ETH_DESC_CNT; i++) {   // Init TX descriptors
+    s_txdesc[i][0] = (uint32_t) s_txbuf[i];  // Point to data buffer
+    s_txdesc[i][1] = BIT(31);                // OWN bit
+  }
+  s_txdesc[ETH_DESC_CNT - 1][1] |= BIT(30);  // Last tx descriptor - wrap
+
+  GMAC_REGS->GMAC_DCFGR = GMAC_DCFGR_DRBS(0x18);  // DMA recv buf 1536
+  for (int i = 0; i < ETH_DESC_CNT; i++) {        // Init RX descriptors
+    s_rxdesc[i][0] = (uint32_t) s_rxbuf[i];       // Address of the data buffer
+    s_rxdesc[i][1] = 0;                           // Clear status
+  }
+  s_rxdesc[ETH_DESC_CNT - 1][0] |= BIT(1);  // Last rx descriptor - wrap
+
+  GMAC_REGS->GMAC_TBQB = (uint32_t) s_txdesc;  // about the descriptor addresses
+  GMAC_REGS->GMAC_RBQB = (uint32_t) s_rxdesc;  // Let the controller know
+
+  GMAC_REGS->SA[0].GMAC_SAB =
+      MG_U32(ifp->mac[3], ifp->mac[2], ifp->mac[1], ifp->mac[0]);
+  GMAC_REGS->SA[0].GMAC_SAT = MG_U32(0, 0, ifp->mac[5], ifp->mac[4]);
+
+  GMAC_REGS->GMAC_UR &= ~GMAC_UR_MII_Msk;  // Disable MII, use RMII
+  GMAC_REGS->GMAC_NCFGR |= GMAC_NCFGR_MAXFS_Msk | GMAC_NCFGR_MTIHEN_Msk |
+                           GMAC_NCFGR_EFRHD_Msk | GMAC_NCFGR_CAF_Msk;
+  GMAC_REGS->GMAC_TSR = GMAC_TSR_HRESP_Msk | GMAC_TSR_UND_Msk |
+                        GMAC_TSR_TXCOMP_Msk | GMAC_TSR_TFC_Msk |
+                        GMAC_TSR_TXGO_Msk | GMAC_TSR_RLE_Msk |
+                        GMAC_TSR_COL_Msk | GMAC_TSR_UBR_Msk;
+  GMAC_REGS->GMAC_RSR = GMAC_RSR_HNO_Msk | GMAC_RSR_RXOVR_Msk |
+                        GMAC_RSR_REC_Msk | GMAC_RSR_BNA_Msk;
+  GMAC_REGS->GMAC_IDR = ~0U;  // Disable interrupts, then enable required
+  GMAC_REGS->GMAC_IER = GMAC_IER_HRESP_Msk | GMAC_IER_ROVR_Msk |
+                        GMAC_IER_TCOMP_Msk | GMAC_IER_TFC_Msk |
+                        GMAC_IER_RLEX_Msk | GMAC_IER_TUR_Msk |
+                        GMAC_IER_RXUBR_Msk | GMAC_IER_RCOMP_Msk;
+  GMAC_REGS->GMAC_NCR |= GMAC_NCR_TXEN_Msk | GMAC_NCR_RXEN_Msk;
+  NVIC_EnableIRQ(GMAC_IRQn);
+
+  return true;
+}
+
+static size_t mg_tcpip_driver_same54_tx(const void *buf, size_t len,
+                                        struct mg_tcpip_if *ifp) {
+  if (len > sizeof(s_txbuf[s_txno])) {
+    MG_ERROR(("Frame too big, %ld", (long) len));
+    len = 0;  // Frame is too big
+  } else if ((s_txdesc[s_txno][1] & BIT(31)) == 0) {
+    ifp->nerr++;
+    MG_ERROR(("No free descriptors"));
+    len = 0;  // All descriptors are busy, fail
+  } else {
+    uint32_t status = len | BIT(15);  // Frame length, last chunk
+    if (s_txno == ETH_DESC_CNT - 1) status |= BIT(30);  // wrap
+    memcpy(s_txbuf[s_txno], buf, len);                  // Copy data
+    s_txdesc[s_txno][1] = status;
+    if (++s_txno >= ETH_DESC_CNT) s_txno = 0;
+  }
+  __DSB();  // Ensure descriptors have been written
+  GMAC_REGS->GMAC_NCR |= GMAC_NCR_TSTART_Msk;  // Enable transmission
+  return len;
+}
+
+static bool mg_tcpip_driver_same54_up(struct mg_tcpip_if *ifp) {
+  uint16_t bsr = eth_read_phy(PHY_ADDR, PHY_BSR);
+  bool up = bsr & PHY_BSR_LINK_STATUS_Msk ? 1 : 0;
+
+  // If PHY is ready, update NCFGR accordingly
+  if (ifp->state == MG_TCPIP_STATE_DOWN && up) {
+    uint16_t bcr = eth_read_phy(PHY_ADDR, PHY_BCR);
+    bool fd = bcr & PHY_BCR_DUPLEX_MODE_Msk ? 1 : 0;
+    bool spd = bcr & PHY_BCR_SPEED_Msk ? 1 : 0;
+    GMAC_REGS->GMAC_NCFGR |= GMAC_NCFGR_SPD(spd) | GMAC_NCFGR_FD(fd);
+  }
+
+  return up;
+}
+
+void GMAC_Handler(void);
+void GMAC_Handler(void) {
+  uint32_t isr = GMAC_REGS->GMAC_ISR;
+  uint32_t rsr = GMAC_REGS->GMAC_RSR;
+  uint32_t tsr = GMAC_REGS->GMAC_TSR;
+  if (isr & GMAC_ISR_RCOMP_Msk) {
+    if (rsr & GMAC_ISR_RCOMP_Msk) {
+      for (uint8_t i = 0; i < ETH_DESC_CNT; i++) {
+        if ((s_rxdesc[s_rxno][0] & BIT(0)) == 0) break;
+        size_t len = s_rxdesc[s_rxno][1] & (BIT(13) - 1);
+        mg_tcpip_qwrite(s_rxbuf[s_rxno], len, s_ifp);
+        s_rxdesc[s_rxno][0] &= ~BIT(0);  // Disown
+        if (++s_rxno >= ETH_DESC_CNT) s_rxno = 0;
+      }
+    }
+  }
+
+  if ((tsr & (GMAC_TSR_HRESP_Msk | GMAC_TSR_UND_Msk | GMAC_TSR_TXCOMP_Msk |
+              GMAC_TSR_TFC_Msk | GMAC_TSR_TXGO_Msk | GMAC_TSR_RLE_Msk |
+              GMAC_TSR_COL_Msk | GMAC_TSR_UBR_Msk)) != 0) {
+    // MG_INFO((" --> %#x %#x", s_txdesc[s_txno][1], tsr));
+    if (!(s_txdesc[s_txno][1] & BIT(31))) s_txdesc[s_txno][1] |= BIT(31);
+  }
+
+  GMAC_REGS->GMAC_RSR = rsr;
+  GMAC_REGS->GMAC_TSR = tsr;
+}
+
+struct mg_tcpip_driver mg_tcpip_driver_same54 = {
+    mg_tcpip_driver_same54_init, mg_tcpip_driver_same54_tx, NULL,
+    mg_tcpip_driver_same54_up};
+#endif
diff --git a/src/tcpip/driver_same54.h b/src/tcpip/driver_same54.h
new file mode 100644
index 00000000..4e92adb6
--- /dev/null
+++ b/src/tcpip/driver_same54.h
@@ -0,0 +1,9 @@
+#pragma once
+
+#if MG_ENABLE_TCPIP && defined(MG_ENABLE_DRIVER_SAME54) && MG_ENABLE_DRIVER_SAME54
+
+struct mg_tcpip_driver_same54_data {
+    int mdc_cr;
+};
+
+#endif
diff --git a/src/tcpip/tcpip.c b/src/tcpip/tcpip.c
index 52a8c139..a0078f87 100644
--- a/src/tcpip/tcpip.c
+++ b/src/tcpip/tcpip.c
@@ -762,6 +762,7 @@ static void mg_tcpip_rx(struct mg_tcpip_if *ifp, void *buf, size_t len) {
   pkt.raw.ptr = (char *) buf;
   pkt.raw.len = len;
   pkt.eth = (struct eth *) buf;
+  //mg_hexdump(buf, len > 16 ? 16: len);
   if (pkt.raw.len < sizeof(*pkt.eth)) return;  // Truncated - runt?
   if (ifp->enable_mac_check &&
       memcmp(pkt.eth->dst, ifp->mac, sizeof(pkt.eth->dst)) != 0 &&
@@ -794,8 +795,8 @@ static void mg_tcpip_rx(struct mg_tcpip_if *ifp, void *buf, size_t len) {
     mkpay(&pkt, pkt.ip + 1);
     rx_ip(ifp, &pkt);
   } else {
-    MG_DEBUG(("  Unknown eth type %x", mg_htons(pkt.eth->type)));
-    mg_hexdump(buf, len >= 16 ? 16 : len);
+    MG_DEBUG(("Unknown eth type %x", mg_htons(pkt.eth->type)));
+    mg_hexdump(buf, len >= 32 ? 32 : len);
   }
 }
 
diff --git a/src/tcpip/tcpip.h b/src/tcpip/tcpip.h
index c7aed964..ec60a288 100644
--- a/src/tcpip/tcpip.h
+++ b/src/tcpip/tcpip.h
@@ -54,6 +54,7 @@ extern struct mg_tcpip_driver mg_tcpip_driver_w5500;
 extern struct mg_tcpip_driver mg_tcpip_driver_tm4c;
 extern struct mg_tcpip_driver mg_tcpip_driver_stm32h;
 extern struct mg_tcpip_driver mg_tcpip_driver_imxrt;
+extern struct mg_tcpip_driver mg_tcpip_driver_same54;
 
 // Drivers that require SPI, can use this SPI abstraction
 struct mg_tcpip_spi {
diff --git a/src/tls_builtin.c b/src/tls_builtin.c
new file mode 100644
index 00000000..eebe5a48
--- /dev/null
+++ b/src/tls_builtin.c
@@ -0,0 +1,165 @@
+#include "tls.h"
+
+#if MG_TLS == MG_TLS_BUILTIN
+struct tls_data {
+  struct mg_iobuf send;
+  struct mg_iobuf recv;
+};
+
+#define MG_LOAD_BE16(p) ((uint16_t) ((MG_U8P(p)[0] << 8U) | MG_U8P(p)[1]))
+#define TLS_HDR_SIZE 5  // 1 byte type, 2 bytes version, 2 bytes len
+
+static inline bool mg_is_big_endian(void) {
+  int v = 1;
+  return *(unsigned char *) &v == 1;
+}
+static inline uint16_t mg_swap16(uint16_t v) {
+  return (uint16_t) ((v << 8U) | (v >> 8U));
+}
+static inline uint32_t mg_swap32(uint32_t v) {
+  return (v >> 24) | (v >> 8 & 0xff00) | (v << 8 & 0xff0000) | (v << 24);
+}
+static inline uint64_t mg_swap64(uint64_t v) {
+  return (((uint64_t) mg_swap32((uint32_t) v)) << 32) |
+         mg_swap32((uint32_t) (v >> 32));
+}
+static inline uint16_t mg_be16(uint16_t v) {
+  return mg_is_big_endian() ? mg_swap16(v) : v;
+}
+static inline uint32_t mg_be32(uint32_t v) {
+  return mg_is_big_endian() ? mg_swap32(v) : v;
+}
+
+static inline void add8(struct mg_iobuf *io, uint8_t data) {
+  mg_iobuf_add(io, io->len, &data, sizeof(data));
+}
+static inline void add16(struct mg_iobuf *io, uint16_t data) {
+  data = mg_htons(data);
+  mg_iobuf_add(io, io->len, &data, sizeof(data));
+}
+static inline void add32(struct mg_iobuf *io, uint32_t data) {
+  data = mg_htonl(data);
+  mg_iobuf_add(io, io->len, &data, sizeof(data));
+}
+
+void mg_tls_init(struct mg_connection *c, struct mg_str hostname) {
+  struct tls_data *tls = (struct tls_data *) calloc(1, sizeof(struct tls_data));
+  if (tls != NULL) {
+    tls->send.align = tls->recv.align = MG_IO_SIZE;
+    c->tls = tls;
+    c->is_tls = c->is_tls_hs = 1;
+  } else {
+    mg_error(c, "tls oom");
+  }
+  (void) hostname;
+}
+void mg_tls_free(struct mg_connection *c) {
+  struct tls_data *tls = c->tls;
+  if (tls != NULL) {
+    mg_iobuf_free(&tls->send);
+    mg_iobuf_free(&tls->recv);
+  }
+  free(c->tls);
+  c->tls = NULL;
+}
+long mg_tls_send(struct mg_connection *c, const void *buf, size_t len) {
+  (void) c, (void) buf, (void) len;
+  // MG_INFO(("BBBBBBBB"));
+  return -1;
+}
+long mg_tls_recv(struct mg_connection *c, void *buf, size_t len) {
+  (void) c, (void) buf, (void) len;
+  char tmp[8192];
+  long n = mg_io_recv(c, tmp, sizeof(tmp));
+  if (n > 0) mg_hexdump(tmp, (size_t) n);
+  MG_INFO(("AAAAAAAA"));
+  return -1;
+  // struct mg_tls *tls = (struct mg_tls *) c->tls;
+  // long n = mbedtls_ssl_read(&tls->ssl, (unsigned char *) buf, len);
+  // if (n == MBEDTLS_ERR_SSL_WANT_READ || n == MBEDTLS_ERR_SSL_WANT_WRITE)
+  //   return MG_IO_WAIT;
+  // if (n <= 0) return MG_IO_ERR;
+  // return n;
+}
+size_t mg_tls_pending(struct mg_connection *c) {
+  (void) c;
+  return 0;
+}
+void mg_tls_handshake(struct mg_connection *c) {
+  struct tls_data *tls = c->tls;
+  struct mg_iobuf *rio = &tls->recv;
+  struct mg_iobuf *wio = &tls->send;
+  // Pull data from TCP
+  for (;;) {
+    mg_iobuf_resize(rio, rio->len + 1);
+    long n = mg_io_recv(c, &rio->buf[rio->len], rio->size - rio->len);
+    if (n > 0) {
+      rio->len += (size_t) n;
+    } else if (n == MG_IO_WAIT) {
+      break;
+    } else {
+      mg_error(c, "IO err");
+      return;
+    }
+  }
+  // Look if we've pulled everything
+  if (rio->len < TLS_HDR_SIZE) return;
+  uint8_t record_type = rio->buf[0];
+  uint16_t record_len = MG_LOAD_BE16(rio->buf + 3);
+  uint16_t record_version = MG_LOAD_BE16(rio->buf + 1);
+  if (record_type != 22) {
+    mg_error(c, "no 22");
+    return;
+  }
+  if (rio->len < (size_t) TLS_HDR_SIZE + record_len) return;
+  // Got full hello
+  // struct tls_hello *hello = (struct tls_hello *) (hdr + 1);
+  MG_INFO(("CT=%d V=%hx L=%hu", record_type, record_version, record_len));
+  mg_hexdump(rio->buf, rio->len);
+
+  // Send response. Server Hello
+  size_t ofs = wio->len;
+  add8(wio, 22), add16(wio, 0x303), add16(wio, 0);  // Layer: type, ver, len
+  add8(wio, 2), add8(wio, 0), add16(wio, 0), add16(wio, 0x304);  // Hello
+  mg_iobuf_add(wio, wio->len, NULL, 32);                         // 32 random
+  mg_random(wio->buf + wio->len - 32, 32);                       // bytes
+  add8(wio, 0);                                                  // Session ID
+  add16(wio, 0x1301);  // Cipher: TLS_AES_128_GCM_SHA256
+  add8(wio, 0);        // Compression method: 0
+  add16(wio, 46);      // Extensions length
+  add16(wio, 43), add16(wio, 2), add16(wio, 0x304);  // extension: TLS 1.3
+  add16(wio, 51), add16(wio, 36), add16(wio, 29), add16(wio, 32);  // keyshare
+  mg_iobuf_add(wio, wio->len, NULL, 32);                           // 32 random
+  mg_random(wio->buf + wio->len - 32, 32);                         // bytes
+  *(uint16_t *) &wio->buf[ofs + 3] = mg_be16((uint16_t) (wio->len - ofs - 5));
+  *(uint16_t *) &wio->buf[ofs + 7] = mg_be16((uint16_t) (wio->len - ofs - 9));
+
+  // Change cipher. Cipher's payload is an encypted app data
+  // ofs = wio->len;
+  add8(wio, 20), add16(wio, 0x303);  // Layer: type, version
+  add16(wio, 1), add8(wio, 1);
+
+  ofs = wio->len;                                   // Application data
+  add8(wio, 23), add16(wio, 0x303), add16(wio, 5);  // Layer: type, version
+  // mg_iobuf_add(wio, wio->len, "\x01\x02\x03\x04\x05", 5);
+  add8(wio, 22);                                       // handshake message
+  add8(wio, 8);                                        // encrypted extensions
+  add8(wio, 0), add16(wio, 2), add16(wio, 0);          // empty 2 bytes
+  add8(wio, 11);                                       // certificate message
+  add8(wio, 0), add16(wio, 4), add32(wio, 0x1020304);  // len
+  *(uint16_t *) &wio->buf[ofs + 3] = mg_be16((uint16_t)(wio->len - ofs - 5));
+
+  mg_io_send(c, wio->buf, wio->len);
+  wio->len = 0;
+
+  rio->len = 0;
+  c->is_tls_hs = 0;
+  mg_error(c, "doh");
+}
+void mg_tls_ctx_free(struct mg_mgr *mgr) {
+  mgr->tls_ctx = NULL;
+}
+void mg_tls_ctx_init(struct mg_mgr *mgr, const struct mg_tls_opts *opts) {
+  (void) opts, (void) mgr;
+}
+#endif