Fix flashinit panic not printing (esp8266#8762)

* fix panic not printing

* improve panic to accept 0 lineno

* always present detailed error message

* Added back lost edit

* For SDK v3.0+, adjust conditional build to remove duplicate call
to flashinit from user_init.

Author: mhightower83

cores/esp8266/core_esp8266_main.cpp

@@ -400,13 +400,9 @@ extern "C" void __disableWiFiAtBootTime (void)
 
 #if FLASH_MAP_SUPPORT
 #include "flash_hal.h"
-extern "C" bool flashinit (void);
-#if (NONOSDK >= (0x30000))
-uint32_t __flashindex __attribute__((section(".noinit")));
-#else
+extern "C" const char *flashinit (void);
 uint32_t __flashindex;
 #endif
-#endif
 
 #if (NONOSDK >= (0x30000))
 #undef ETS_PRINTF
@@ -432,8 +428,8 @@ extern "C" void ICACHE_FLASH_ATTR user_pre_init(void)
 
     do {
         #if FLASH_MAP_SUPPORT
-        if (!flashinit()) {
-            flash_map_str = PSTR("flashinit: flash size missing from FLASH_MAP table\n");
+        flash_map_str = flashinit();
+        if (flash_map_str) {
             continue;
         }
         #endif
@@ -631,6 +627,11 @@ extern "C" void user_init(void) {
 
     uart_div_modify(0, UART_CLK_FREQ / (115200));
 
+#if FLASH_MAP_SUPPORT && (NONOSDK < (0x30000))
+    const char *err_msg = flashinit();
+    if (err_msg) __panic_func(err_msg, 0, NULL);
+#endif
+
     init(); // in core_esp8266_wiring.c, inits hw regs and sdk timer
 
     initVariant();
@@ -653,11 +654,6 @@ extern "C" void user_init(void) {
 
 #if defined(MMU_IRAM_HEAP)
     umm_init_iram();
-#endif
-#if FLASH_MAP_SUPPORT && (NONOSDK < 0x30000)
-    if (!flashinit()) {
-        panic();
-    }
 #endif
     preinit(); // Prior to C++ Dynamic Init (not related to above init() ). Meant to be user redefinable.
     __disableWiFiAtBootTime(); // default weak function disables WiFi

cores/esp8266/core_esp8266_postmortem.cpp

@@ -140,6 +140,9 @@ void __wrap_system_restart_local() {
         }
         ets_putc('\n');
     }
+    else if (s_panic_file) {
+        ets_printf_P(PSTR("\nPanic %S\n"), s_panic_file);
+    }
     else if (s_unhandled_exception) {
         ets_printf_P(PSTR("\nUnhandled C++ exception: %S\n"), s_unhandled_exception);
     }

cores/esp8266/flash_hal.h

@@ -33,21 +33,26 @@ extern "C" {
 #include <FlashMap.h>
 
 extern uint32_t spi_flash_get_id (void); // <user_interface.h>
-extern bool flashinit(void);
+extern const char *flashinit(void);
 extern uint32_t __flashindex;
 extern const flash_map_s __flashdesc[];
 
+#ifndef QUOTE
+#define QUOTE(a) __STRINGIFY(a)
+#endif
+
 #define FLASH_MAP_SETUP_CONFIG(conf) FLASH_MAP_SETUP_CONFIG_ATTR(,conf)
 #define FLASH_MAP_SETUP_CONFIG_ATTR(attr, conf...) \
   const flash_map_s __flashdesc[] PROGMEM = conf; \
-  bool flashinit (void) attr; \
-  bool flashinit (void) \
+  const char *flashinit (void) attr; \
+  const char *flashinit (void) \
   { \
     uint32_t flash_chip_size_kb = 1 << (((spi_flash_get_id() >> 16) & 0xff) - 10); \
     for (__flashindex = 0; __flashindex < sizeof(__flashdesc) / sizeof(__flashdesc[0]); __flashindex++) \
       if (__flashdesc[__flashindex].flash_size_kb == flash_chip_size_kb) \
-        return true; \
-    return false; /* configuration not found */ \
+        return NULL; \
+    static const char fail_msg[] PROGMEM = __FILE__ ":" QUOTE(__LINE__) " flashinit: configuration not found"; \
+    return fail_msg; /* configuration not found */ \
   }
 
 #define EEPROM_start (__flashdesc[__flashindex].eeprom_start)