changes in Bootloader- saving image in external flash and transferring in internal via Bootloader

Question

Hi , I am using ZEPHYR rtos , and using the internal bootloader and its working fine and there are two images but now my code size has increased and i can not store 2 images in internal flash so have to do implementation of saving the image to external flash and after validation move to internal flash ,what changes i require to make in zephyr bootloader to add external flash code(SPI) and using only 1 image in bootloader

Hung Bui · Accepted Answer

Hi, Please find my example of using external flash with MCUBoot and smpsvr. I have tested here and it worked for both nRF5340DK and nRF52840DK , it should be the same for the nRF52833 DK. Please test them on the DK first and then try to port it to your board with SPI instead of QSPI. Note that your flash driver should support:

Single-byte read and write.

Writing data from the internal flash memory to the external flash memory.

The example only support DFU via UART (using mcumgr)

changes in Bootloader- saving image in external flash and transferring in internal via Bootloader

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