diff --git a/.travis.yml b/.travis.yml
index 31df1f8f..1a182dee 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -28,11 +28,12 @@ install:
     - pip2 install ecdsa mnemonic protobuf requests
 
 script:
-  - test "$GOAL" != "stm32" || test "$CC" != "gcc" || make vendorheader
-  - test "$GOAL" != "stm32" || test "$CC" != "gcc" || make build_cross
-  - test "$GOAL" != "stm32" || test "$CC" != "gcc" || make build_boardloader
-  - test "$GOAL" != "stm32" || test "$CC" != "gcc" || make build_bootloader
-  - test "$GOAL" != "stm32" || test "$CC" != "gcc" || make build_firmware
+  - test "$GOAL" != "stm32" || make vendorheader
+  - test "$GOAL" != "stm32" || make build_cross
+  - test "$GOAL" != "stm32" || make build_boardloader
+  - test "$GOAL" != "stm32" || make build_bootloader
+  - test "$GOAL" != "stm32" || make build_firmware
+  - test "$GOAL" != "stm32" || make sizecheck
 
   - test "$GOAL" != "unix" || make build_unix TREZOR_NOUI=1
   - test "$GOAL" != "unix" || make test
diff --git a/Makefile b/Makefile
index 819464fb..8c4b43bd 100644
--- a/Makefile
+++ b/Makefile
@@ -56,11 +56,11 @@ build_boardloader: ## build boardloader
 
 build_bootloader: ## build bootloader
 	$(MAKE) -f Makefile.bootloader $(TREZORHAL_PORT_OPTS)
-	./tools/binctl micropython/bootloader/build/bootloader.bin -s 1 4141414141414141414141414141414141414141414141414141414141414141
+	./tools/binctl $(BOOTLOADER_BUILD_DIR)/bootloader.bin -s 1 4141414141414141414141414141414141414141414141414141414141414141
 
 build_firmware: res build_cross ## build firmware with frozen modules
 	$(MAKE) -f Makefile.firmware $(TREZORHAL_PORT_OPTS)
-	./tools/binctl micropython/firmware/build/firmware.bin -s 1 4141414141414141414141414141414141414141414141414141414141414141
+	./tools/binctl $(FIRMWARE_BUILD_DIR)/firmware.bin -s 1 4141414141414141414141414141414141414141414141414141414141414141
 
 build_unix: ## build unix port
 	$(MAKE) -f ../../../micropython/unix/Makefile -C vendor/micropython/unix $(UNIX_PORT_OPTS)
@@ -117,10 +117,15 @@ vendorheader: ## construct default vendor header
 	./tools/binctl micropython/firmware/vendorheader.bin -s 1 4141414141414141414141414141414141414141414141414141414141414141
 
 binctl: ## print info about binary files
-	./tools/binctl micropython/bootloader/build/bootloader.bin
+	./tools/binctl $(BOOTLOADER_BUILD_DIR)/bootloader.bin
 	./tools/binctl micropython/firmware/vendorheader.bin
-	./tools/binctl micropython/firmware/build/firmware.bin
+	./tools/binctl $(FIRMWARE_BUILD_DIR)/firmware.bin
 
 bloaty: ## run bloaty size profiler
-	bloaty -d symbols -n 0 -s file micropython/firmware/build/firmware.elf | less
-	bloaty -d compileunits -n 0 -s file micropython/firmware/build/firmware.elf | less
+	bloaty -d symbols -n 0 -s file $(FIRMWARE_BUILD_DIR)/firmware.elf | less
+	bloaty -d compileunits -n 0 -s file $(FIRMWARE_BUILD_DIR)/firmware.elf | less
+
+sizecheck: ## check sizes of binary files
+	test 32768 -ge $(shell stat -c%s $(BOARDLOADER_BUILD_DIR)/boardloader.bin)
+	test 65536 -ge $(shell stat -c%s $(BOOTLOADER_BUILD_DIR)/bootloader.bin)
+	test 917504 -ge $(shell stat -c%s $(FIRMWARE_BUILD_DIR)/firmware.bin)
diff --git a/micropython/boardloader/main.c b/micropython/boardloader/main.c
index 13863a86..c0d290c8 100644
--- a/micropython/boardloader/main.c
+++ b/micropython/boardloader/main.c
@@ -13,7 +13,7 @@
 #define IMAGE_MAXSIZE (1 * 64 * 1024 + 7 * 128 * 1024)
 
 void pendsv_isr_handler(void) {
-    __fatal_error("pendsv");
+    __fatal_error("pendsv", __FILE__, __LINE__, __FUNCTION__);
 }
 
 bool check_sdcard(void)
@@ -146,15 +146,15 @@ int main(void)
     periph_init();
 
     if (0 != display_init()) {
-        __fatal_error("display_init failed");
+        __fatal_error("display_init", __FILE__, __LINE__, __FUNCTION__);
     }
 
     if (0 != flash_init()) {
-        __fatal_error("flash_init failed");
+        __fatal_error("flash_init", __FILE__, __LINE__, __FUNCTION__);
     }
 
     if (0 != sdcard_init()) {
-        __fatal_error("sdcard_init failed");
+        __fatal_error("sdcard_init", __FILE__, __LINE__, __FUNCTION__);
     }
 
     display_clear();
@@ -166,13 +166,13 @@ int main(void)
 
     if (check_sdcard()) {
         if (!copy_sdcard()) {
-            __fatal_error("halt");
+            __fatal_error("HALT", __FILE__, __LINE__, __FUNCTION__);
         }
     }
 
     check_and_jump();
 
-    __fatal_error("halt");
+    __fatal_error("HALT", __FILE__, __LINE__, __FUNCTION__);
 
     return 0;
 }
diff --git a/micropython/bootloader/main.c b/micropython/bootloader/main.c
index 0dc94ed7..4f415058 100644
--- a/micropython/bootloader/main.c
+++ b/micropython/bootloader/main.c
@@ -19,7 +19,7 @@
 #define IMAGE_MAXSIZE (7 * 128 * 1024)
 
 void pendsv_isr_handler(void) {
-    __fatal_error("pendsv");
+    __fatal_error("pendsv", __FILE__, __LINE__, __FUNCTION__);
 }
 
 void display_vendor(const uint8_t *vimg, const char *vstr, uint32_t vstr_len, uint32_t fw_version)
@@ -132,13 +132,13 @@ int usb_init_all(void) {
     };
 
     if (0 != usb_init(&dev_info)) {
-        __fatal_error("usb_init failed");
+        __fatal_error("usb_init", __FILE__, __LINE__, __FUNCTION__);
     }
     if (0 != usb_hid_add(&hid_info)) {
-        __fatal_error("usb_hid_add failed");
+        __fatal_error("usb_hid_add", __FILE__, __LINE__, __FUNCTION__);
     }
     if (0 != usb_start()) {
-        __fatal_error("usb_start failed");
+        __fatal_error("usb_start", __FILE__, __LINE__, __FUNCTION__);
     }
 
     return 0;
@@ -182,11 +182,11 @@ uint32_t process_upload_message(uint32_t msg_size, const uint8_t *initbuf, uint3
 void mainloop(void)
 {
     if (0 != flash_init()) {
-        __fatal_error("flash_init failed");
+        __fatal_error("flash_init", __FILE__, __LINE__, __FUNCTION__);
     }
 
     if (0 != usb_init_all()) {
-        __fatal_error("usb_init_all failed");
+        __fatal_error("usb_init_all", __FILE__, __LINE__, __FUNCTION__);
     }
 
     uint8_t buf[USB_PACKET_SIZE];
@@ -238,11 +238,11 @@ int main(void)
     periph_init();
 
     if (0 != display_init()) {
-        __fatal_error("display_init failed");
+        __fatal_error("display_init", __FILE__, __LINE__, __FUNCTION__);
     }
 
     if (0 != touch_init()) {
-        __fatal_error("touch_init failed");
+        __fatal_error("touch_init", __FILE__, __LINE__, __FUNCTION__);
     }
 
     display_clear();
@@ -258,14 +258,7 @@ int main(void)
         check_and_jump();
     }
 
-    __fatal_error("halt");
+    __fatal_error("HALT", __FILE__, __LINE__, __FUNCTION__);
 
     return 0;
 }
-
-#ifndef NDEBUG
-void __assert_func(const char *file, int line, const char *func, const char *expr) {
-    // printf("Assertion '%s' failed, at file %s:%d\n", expr, file, line);
-    __fatal_error("Assertion failed");
-}
-#endif
diff --git a/micropython/extmod/modtrezorutils/modtrezorutils.c b/micropython/extmod/modtrezorutils/modtrezorutils.c
index b27f52a0..c70df605 100644
--- a/micropython/extmod/modtrezorutils/modtrezorutils.c
+++ b/micropython/extmod/modtrezorutils/modtrezorutils.c
@@ -60,12 +60,10 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_TrezorUtils_memcpy_obj, 5, 5, mod
 STATIC mp_obj_t mod_TrezorUtils_halt(size_t n_args, const mp_obj_t *args) {
     mp_buffer_info_t msg;
     if (n_args > 0 && mp_get_buffer(args[0], &msg, MP_BUFFER_READ)) {
-        printf("HALT! %s\n", (const char *)msg.buf);
+        __fatal_error(msg.buf, __FILE__, __LINE__, __FUNCTION__);
     } else {
-        printf("HALT!\n");
+        __fatal_error("HALT", __FILE__, __LINE__, __FUNCTION__);
     }
-    // TODO: is this the best we can do?
-    __fatal_error("HALT");
     return mp_const_none;
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_TrezorUtils_halt_obj, 0, 1, mod_TrezorUtils_halt);
diff --git a/micropython/firmware/main.c b/micropython/firmware/main.c
index 8b1e3efe..3590e77d 100644
--- a/micropython/firmware/main.c
+++ b/micropython/firmware/main.c
@@ -28,23 +28,23 @@ int main(void) {
     pendsv_init();
 
     if (0 != display_init()) {
-        __fatal_error("display_init failed");
+        __fatal_error("display_init", __FILE__, __LINE__, __FUNCTION__);
     }
 
     if (0 != flash_init()) {
-        __fatal_error("flash_init failed");
+        __fatal_error("flash_init", __FILE__, __LINE__, __FUNCTION__);
     }
 
     if (0 != rng_init()) {
-        __fatal_error("rng_init failed");
+        __fatal_error("rng_init", __FILE__, __LINE__, __FUNCTION__);
     }
 
     if (0 != sdcard_init()) {
-        __fatal_error("sdcard_init failed");
+        __fatal_error("sdcard_init", __FILE__, __LINE__, __FUNCTION__);
     }
 
     if (0 != touch_init()) {
-        __fatal_error("touch_init failed");
+        __fatal_error("touch_init", __FILE__, __LINE__, __FUNCTION__);
     }
 
     for (;;) {
@@ -72,13 +72,6 @@ int main(void) {
     return 0;
 }
 
-#ifndef NDEBUG
-void __assert_func(const char *file, int line, const char *func, const char *expr) {
-    printf("Assertion '%s' failed, at file %s:%d\n", expr, file, line);
-    __fatal_error("Assertion failed");
-}
-#endif
-
 // Micropython file I/O stubs
 
 mp_lexer_t *mp_lexer_new_from_file(const char *filename) {
diff --git a/micropython/trezorhal/common.c b/micropython/trezorhal/common.c
index 15056857..cbabcc90 100644
--- a/micropython/trezorhal/common.c
+++ b/micropython/trezorhal/common.c
@@ -6,12 +6,18 @@
 #define FATAL_FGCOLOR 0xFFFF
 #define FATAL_BGCOLOR 0x7800
 
-void __attribute__((noreturn)) __fatal_error(const char *msg) {
+void __attribute__((noreturn)) __fatal_error(const char *msg, const char *file, int line, const char *func) {
     for (volatile uint32_t delay = 0; delay < 10000000; delay++) {
     }
-    display_print("FATAL ERROR:\n", -1);
+    display_print("\nFATAL ERROR:\n", -1);
     display_print(msg, -1);
-    display_print("\n", -1);
+    if (file) {
+        display_print("\nFile: ", -1); display_print(file, -1); (void)line;
+    }
+    if (func) {
+        display_print("\nFunc: ", -1); display_print(func, -1);
+    }
+    display_print("\n", 1);
     display_print_out(FATAL_FGCOLOR, FATAL_BGCOLOR);
     for (;;) {
         display_backlight(255);
@@ -21,8 +27,17 @@ void __attribute__((noreturn)) __fatal_error(const char *msg) {
     }
 }
 
+#ifndef NDEBUG
+void __assert_func(const char *file, int line, const char *func, const char *expr) {
+    display_print("\nassert(", -1);
+    display_print(expr, -1);
+    display_print(")\n", 2);
+    __fatal_error("Assertion failed", file, line, func);
+}
+#endif
+
 void __attribute__((noreturn)) nlr_jump_fail(void *val) {
-    __fatal_error("uncaught exception");
+    __fatal_error("uncaught exception", __FILE__, __LINE__, __FUNCTION__);
 }
 
 extern void SystemClock_Config(void);
diff --git a/micropython/trezorhal/common.h b/micropython/trezorhal/common.h
index 5fedace7..c052ec61 100644
--- a/micropython/trezorhal/common.h
+++ b/micropython/trezorhal/common.h
@@ -10,9 +10,9 @@
 
 void periph_init(void);
 
-void __attribute__((noreturn)) nlr_jump_fail(void *val);
+void __attribute__((noreturn)) __fatal_error(const char *msg, const char *file, int line, const char *func);
 
-void __attribute__((noreturn)) __fatal_error(const char *msg);
+void __attribute__((noreturn)) nlr_jump_fail(void *val);
 
 void jump_to(uint32_t address);
 
diff --git a/micropython/trezorhal/stm32_it.c b/micropython/trezorhal/stm32_it.c
index 8727ebbb..4984bc88 100644
--- a/micropython/trezorhal/stm32_it.c
+++ b/micropython/trezorhal/stm32_it.c
@@ -71,12 +71,11 @@
 #include "gccollect.h"
 
 #include "display.h"
+#include "common.h"
 
 #define IRQ_ENTER(irq)
 #define IRQ_EXIT(irq)
 
-extern void __fatal_error(const char*);
-
 /******************************************************************************/
 /*            Cortex-M4 Processor Exceptions Handlers                         */
 /******************************************************************************/
@@ -174,7 +173,7 @@ void HardFault_C_Handler(ExceptionRegisters_t *regs) {
 
     /* Go to infinite loop when Hard Fault exception occurs */
     while (1) {
-        __fatal_error("HardFault");
+        __fatal_error("HardFault", __FILE__, __LINE__, __FUNCTION__);
     }
 }
 
@@ -216,7 +215,7 @@ void NMI_Handler(void) {
 void MemManage_Handler(void) {
     /* Go to infinite loop when Memory Manage exception occurs */
     while (1) {
-        __fatal_error("MemManage");
+        __fatal_error("MemManage", __FILE__, __LINE__, __FUNCTION__);
     }
 }
 
@@ -228,7 +227,7 @@ void MemManage_Handler(void) {
 void BusFault_Handler(void) {
     /* Go to infinite loop when Bus Fault exception occurs */
     while (1) {
-        __fatal_error("BusFault");
+        __fatal_error("BusFault", __FILE__, __LINE__, __FUNCTION__);
     }
 }
 
@@ -240,7 +239,7 @@ void BusFault_Handler(void) {
 void UsageFault_Handler(void) {
     /* Go to infinite loop when Usage Fault exception occurs */
     while (1) {
-        __fatal_error("UsageFault");
+        __fatal_error("UsageFault", __FILE__, __LINE__, __FUNCTION__);
     }
 }
 
diff --git a/micropython/trezorhal/stm32_system.c b/micropython/trezorhal/stm32_system.c
index ce21091a..3f1aa59e 100644
--- a/micropython/trezorhal/stm32_system.c
+++ b/micropython/trezorhal/stm32_system.c
@@ -95,7 +95,7 @@
 #define MICROPY_HW_CLK_PLLQ (7)
 #define MICROPY_HW_CLK_LAST_FREQ (1)
 
-void __fatal_error(const char *msg);
+#include "common.h"
 
 /**
   * @}
@@ -324,7 +324,7 @@ void SystemClock_Config(void)
     RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
     RCC_OscInitStruct.LSEState = RCC_LSE_ON;
     if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
-        __fatal_error("HAL_RCC_OscConfig");
+        __fatal_error("HAL_RCC_OscConfig", __FILE__, __LINE__, __FUNCTION__);
     }
     #endif
 
@@ -409,14 +409,14 @@ void SystemClock_Config(void)
 #endif
   if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
   {
-    __fatal_error("HAL_RCC_OscConfig");
+    __fatal_error("HAL_RCC_OscConfig", __FILE__, __LINE__, __FUNCTION__);
   }
 
 #if defined(MCU_SERIES_F7)
   /* Activate the OverDrive to reach the 200 MHz Frequency */
   if (HAL_PWREx_EnableOverDrive() != HAL_OK)
   {
-    __fatal_error("HAL_PWREx_EnableOverDrive");
+    __fatal_error("HAL_PWREx_EnableOverDrive", __FILE__, __LINE__, __FUNCTION__);
   }
 #endif
 
@@ -426,7 +426,7 @@ void SystemClock_Config(void)
 
   if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, MICROPY_HW_FLASH_LATENCY) != HAL_OK)
   {
-    __fatal_error("HAL_RCC_ClockConfig");
+    __fatal_error("HAL_RCC_ClockConfig", __FILE__, __LINE__, __FUNCTION__);
   }
 
 #if defined(MCU_SERIES_F7)
diff --git a/micropython/unix/common.c b/micropython/unix/common.c
index 418a7715..c5c5a94c 100644
--- a/micropython/unix/common.c
+++ b/micropython/unix/common.c
@@ -3,8 +3,13 @@
 
 #include "common.h"
 
-void __attribute__((noreturn)) __fatal_error(const char *msg) {
-    printf("FATAL ERROR:\n");
-    printf("%s\n", msg);
+void __attribute__((noreturn)) __fatal_error(const char *msg, const char *file, int line, const char *func) {
+    printf("\nFATAL ERROR:\n%s\n", msg);
+    if (file) {
+        printf("File: %s:%d\n", file, line);
+    }
+    if (func) {
+        printf("Func: %s\n", func);
+    }
     exit(1);
 }
diff --git a/micropython/unix/common.h b/micropython/unix/common.h
index 24cc6b52..7b2586ec 100644
--- a/micropython/unix/common.h
+++ b/micropython/unix/common.h
@@ -1,6 +1,6 @@
 #ifndef __TREZORUNIX_COMMON_H__
 #define __TREZORUNIX_COMMON_H__
 
-void __attribute__((noreturn)) __fatal_error(const char *msg);
+void __attribute__((noreturn)) __fatal_error(const char *msg, const char *file, int line, const char *func);
 
 #endif