Zephyr/mcuboot QSPI driver buffer alignment

RE: Zephyr/mcuboot QSPI driver buffer alignment

Stephan Walter — Wed, 01 Sep 2021 06:42:19 GMT

Looks like the alignment issue was fixed in this commit: https://github.com/nrfconnect/sdk-mcuboot/commit/a448efb07f139d076abeb2a2ba645421edbabd25

boot_validated_swap_type still can't handle a secondary slot being in external flash.

RE: Zephyr/mcuboot QSPI driver buffer alignment

Simon — Thu, 25 Mar 2021 15:29:19 GMT

I got in contact with someone internally that will look into this. I'll keep you updated.

Best regards,

Simon

RE: Zephyr/mcuboot QSPI driver buffer alignment

jm_laird — Wed, 24 Mar 2021 08:40:41 GMT

Hi Simon,

Has this issue been fixed now?

Thanks,
Jamie

RE: Zephyr/mcuboot QSPI driver buffer alignment

Simon — Wed, 10 Feb 2021 14:28:21 GMT

I created an internal ticket. I'll keep you updated.

Best regards,

Simon

RE: Zephyr/mcuboot QSPI driver buffer alignment

Stephan Walter — Wed, 10 Feb 2021 07:07:03 GMT

Hi Simon,
I don't know what the proper fix for the alignment would be, the CMakeLists addition is just a hack in my view. I also have not looked into mcuboot thourougly to be able to fix the issue with reading the secondary slot.

Best regards,

--Stephan Walter

RE: Zephyr/mcuboot QSPI driver buffer alignment

Simon — Tue, 09 Feb 2021 16:59:54 GMT

Would you be able to make a pull request: https://devzone.nordicsemi.com/f/nordic-q-a/57409/process-for-contributing-to-nrf-connect-sdk?

If not, please tell me and I'll do it/make an internal ticket.

Best regards,

Simon

RE: Zephyr/mcuboot QSPI driver buffer alignment

Stephan Walter — Wed, 03 Feb 2021 12:46:01 GMT

There seems to be another problem with mcuboot when used with an external flash on nRF53:

An upgrade of the network core fails, because the image will overwrite the application core flash.

It seems that the determination of reset_addr in the function boot_validated_swap_type fails, but I'm still investigating this.

Edit: looks like the code introduced in https://github.com/nrfconnect/sdk-mcuboot/commit/84cc24d4795540331fe62a435e4cf9365fbb736a assumes that the secondary slot is in internal flash and does not contain an encrypted image.

RE: Zephyr/mcuboot QSPI driver buffer alignment

Stephan Walter — Wed, 03 Feb 2021 11:42:20 GMT

As a workaround, the following can be added to the main CMakeLists.txt:

file(APPEND "${CMAKE_CURRENT_BINARY_DIR}/mcuboot/zephyr/include/generated/snippets-sections.ld" "bss : SUBALIGN(4) {}")

This will force 4-byte alignment for all uninitialized variables in the mcuboot image.