ESP32 Forum

Hello guys,

I would like to know if its possible to write to flash from 2nd stage Bootloader.
I tried using the spi_write_flash methods, but this module is compiled differently when used in bootloader-module, so all writes go into some kind of emulator instead of physical memory.

Is there another way Im not aware of?

I'll appreciate any help,
Thanks for the support

Hi,

You can call the functions declared in bootloader_flash.h from inside the bootloader:
https://github.com/espressif/esp-idf/bl ... lash.h#L78

Note that there are restrictions of length & alignment on these functions which are not present in the normal SPI flash API. See the comments in the header for full details.

Angus