ESP32 Forum

Hello ESP32 community,

I am currently working on a project where I need to perform firmware updates over the air (OTA) using a cellular network. The chipset I'm using is ESP32S3. However, I am encountering a Guru Meditation Error during the OTA process, specifically within the esp_ota_end() function. The error seems to be related to cache issues during flash write operations.

Logs:
I (301670) esp_image: segment 0: paddr=00250020 vaddr=3c0c0020 size=35b7ch (220028) map
Guru Meditation Error: Core / panic'ed (Cache disabled but cached memory region accessed).
Write back error occurred while dcache tries to write back to flash


Core 0 register dump:
PC : 0x42091700 PS : 0x00060e34 A0 : 0x82070128 A1 : 0x3fcab2b0
0x42091700: sha_ll_fill_text_block at C:\Users\Adapt\esp\esp-idf\workspace-z\anchor-go\build/../../../components/hal/esp32s3/include/hal/sha_ll.h:115
(inlined by) sha_hal_hash_block at C:/Users/Adapt/esp/esp-idf/components/hal/sha_hal.c:83

A2 : 0x00000002 A3 : 0x3c104d40 A4 : 0x00000010 A5 : 0x00000000
A6 : 0x08000000 A7 : 0x3fcab2a0 A8 : 0x7261705f A9 : 0x00000008
A10 : 0x6003b09c A11 : 0x00000000 A12 : 0x00060020 A13 : 0x3fcf7584
A14 : 0x0000000a A15 : 0x3fcab250 SAR : 0x00000008 EXCCAUSE: 0x00000007
EXCVADDR: 0x00000000 LBEG : 0x40056f5c LEND : 0x40056f72 LCOUNT : 0x00000000


Backtrace:0x420916fd:0x3fcab2b00x42070125:0x3fcab2d0 0x4207045e:0x3fcab2f0 0x4206e065:0x3fcab330 0x42030e37:0x3fcab350 0x420309e5:0x3fcab370 0x42030b23:0x3fcab3b0 0x42030b73:0x3fcab410 0x42030cd2:0x3fcab450 0x42030d69:0x3fcab480 0x4202ff71:0x3fcab4a0 0x42014dd4:0x3fcab5d0 0x42014fac:0x3fcadae0 0x42015082:0x3fcadb50 0x42012b3a:0x3fcadc80 0x42012bcf:0x3fcadcb0 0x420aebf2:0x3fcadcd0 0x4037dfb5:0x3fcadcf0
0x420916fd: sha_ll_fill_text_block at C:\Users\Adapt\esp\esp-idf\workspace-z\anchor-go\build/../../../components/hal/esp32s3/include/hal/sha_ll.h:116
(inlined by) sha_hal_hash_block at C:/Users/Adapt/esp/esp-idf/components/hal/sha_hal.c:83

0x42070125: esp_sha_block_mode at C:/Users/Adapt/esp/esp-idf/components/mbedtls/port/sha/dma/sha.c:200 (discriminator 3)

0x4207045e: esp_sha_dma at C:/Users/Adapt/esp/esp-idf/components/mbedtls/port/sha/dma/sha.c:227

0x4206e065: mbedtls_sha256_update_ret at C:/Users/Adapt/esp/esp-idf/components/mbedtls/port/sha/dma/esp_sha256.c:193

0x42030e37: bootloader_sha256_data at C:/Users/Adapt/esp/esp-idf/components/bootloader_support/src/idf/bootloader_sha.c:32

0x420309e5: process_segment_data at C:/Users/Adapt/esp/esp-idf/components/bootloader_support/src/esp_image_format.c:634

0x42030b23: process_segment at C:/Users/Adapt/esp/esp-idf/components/bootloader_support/src/esp_image_format.c:565

0x42030b73: process_segments at C:/Users/Adapt/esp/esp-idf/components/bootloader_support/src/esp_image_format.c:486

0x42030cd2: image_load at C:/Users/Adapt/esp/esp-idf/components/bootloader_support/src/esp_image_format.c:152 (discriminator 6)

0x42030d69: esp_image_verify at C:/Users/Adapt/esp/esp-idf/components/bootloader_support/src/esp_image_format.c:274

0x4202ff71: esp_ota_end at C:/Users/Adapt/esp/esp-idf/components/app_update/esp_ota_ops.c:347

0x42014dd4: ota_example_task_cell at C:\Users\Adapt\esp\esp-idf\workspace-z\anchor-go\build/../components/FOTA/ota_native_app.h:671

0x42014fac: app_fota at C:\Users\Adapt\esp\esp-idf\workspace-z\anchor-go\build/../components/FOTA/ota_native_app.h:843

0x42015082: zn_fota_check_after_transmit at C:\Users\Adapt\esp\esp-idf\workspace-z\anchor-go\build/../components/FOTA/zn_fota.c:90

0x42012b3a: app_integration at C:\Users\Adapt\esp\esp-idf\workspace-z\anchor-go\build/../main/Inc/app.h:15631

0x42012bcf: app_main at C:\Users\Adapt\esp\esp-idf\workspace-z\anchor-go\build/../main/main.c:19

0x420aebf2: main_task at C:/Users/Adapt/esp/esp-idf/components/freertos/port/port_common.c:129 (discriminator 2)

0x4037dfb5: vPortTaskWrapper at C:/Users/Adapt/esp/esp-idf/components/freertos/port/xtensa/port.c:131


ELF file SHA256: f1bcc1f2ef583e21

Rebooting...



Context:

The error occurs when attempting to update the firmware over a cellular network. It appears that the issue is related to cache and flash memory operations during the esp_ota_end() function. I'm seeking assistance in resolving this. Any help is greatly appreciated.

Have you checked here?
https://github.com/espressif/arduino-esp32/issues/3634

Hi,

I have checked the given link and tried the different INTR_IN_IRAM settings but still getting the same issue.

The error message specifically mentions "Cache disabled but cached memory region accessed," and it seems to be happening during the execution of the esp_ota_end() function.Carefully review the code related to flash write operations, especially in the esp_ota_end() function.