Merge branch 'fix/fetch_image_hdr_v5.4' into 'release/v5.4'

fix(esp_system): Correct address used to fetch application image header (v5.4)

See merge request espressif/esp-idf!34627

Author: mahavirj

components/esp_system/port/cpu_start.c

@@ -13,6 +13,7 @@
 
 #include "esp_log.h"
 #include "esp_chip_info.h"
+#include "esp_app_format.h"
 
 #include "esp_private/cache_err_int.h"
 #include "esp_clk_internal.h"
@@ -787,9 +788,13 @@ void IRAM_ATTR call_start_cpu0(void)
     // Read the application binary image header. This will also decrypt the header if the image is encrypted.
     __attribute__((unused)) esp_image_header_t fhdr = {0};
 
-    // This assumes that DROM is the first segment in the application binary, i.e. that we can read
-    // the binary header through cache by accessing SOC_DROM_LOW address.
-    hal_memcpy(&fhdr, (void *) SOC_DROM_LOW, sizeof(fhdr));
+    // We can access the image header through the cache by reading from the memory-mapped virtual DROM start offset
+    uint32_t fhdr_src_addr = (uint32_t)(&_rodata_reserved_start) - sizeof(esp_image_header_t) - sizeof(esp_image_segment_header_t);
+    hal_memcpy(&fhdr, (void *) fhdr_src_addr, sizeof(fhdr));
+    if (fhdr.magic != ESP_IMAGE_HEADER_MAGIC) {
+        ESP_EARLY_LOGE(TAG, "Invalid app image header");
+        abort();
+    }
 
 #if CONFIG_IDF_TARGET_ESP32
 #if !CONFIG_SPIRAM_BOOT_INIT