esp-bootloader-plus's Introduction

esp bootloader plus

Description

This version runs fine on my ESP32S3 board. If it does not work for you, check out the next section.

My Steps of Adding Support for ESP32S3

Follow the instructions from README to add the custom bootloader to your project.
Build the project directly
- It's supposed to fail since your project is based on ESP32S3. Keep a record of the error message for later use.
Make a copy of ./esp-xz/ld/esp32c3 and name it as ./esp-xz/ld/esp32s3
Modify ./esp-xz/CMakeLists.txt so it will use the corresponding linker.lf when the project target is ESP32S3

if(BOOTLOADER_BUILD)
        if (CONFIG_IDF_TARGET_ESP32C2 OR CONFIG_IDF_TARGET_ESP32C3 OR CONFIG_IDF_TARGET_ESP32S3)
                target_linker_script(${COMPONENT_LIB} INTERFACE "ld/${CONFIG_IDF_TARGET}/linker.lf")
        endif()
endif()

Modify ./esp-xz/ld/esp32s3/linker.lf according to the error message showed in step 2
- Adjust the org for iram_loader1_seg
- e.g. My error message contains something like section .iram_loader.text LMA [00000000403cc700,00000000403cf8b6] overlaps section.iram.text LMA [00000000403c9700,00000000403ccc0b]
  - So I adjusted the org value from 0x403DA000 to 0x403ccc0d to avoid overlapping
  - Build the project again and keep adjusting until there's no more error
Now the custom bootloader should be good to go on your ESP32S3 board

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