how to verify after writing to external FLASH memory during full modem update (FOTA).

RE: how to verify after writing to external FLASH memory during full modem update (FOTA).

dejans — Thu, 23 Mar 2023 10:40:57 GMT

Hi,

There is a function boot_read_bank_header() which reads MCUboot image header information.

Best regards,
Dejan

RE: how to verify after writing to external FLASH memory during full modem update (FOTA).

Praveen Deshmane — Thu, 23 Mar 2023 00:35:26 GMT

Hi Dejans,

thank you for your reply.

I would like to know how to check the downloaded file app_update.bin is in mucboot secondary (in my case it is in external flash memory which is of 8MB).

Best Regards

Praveen Deshmane

RE: how to verify after writing to external FLASH memory during full modem update (FOTA).

dejans — Wed, 22 Mar 2023 12:23:28 GMT

Hi,

Inside fmfu_fdev.c, there is a function fmfu_fdev_load() which reads cbor header, gets the hash from the manifest, checks the hash and proceeds with install using load_segments().

Best regards,
Dejan

RE: how to verify after writing to external FLASH memory during full modem update (FOTA).

Praveen Deshmane — Tue, 21 Mar 2023 12:00:26 GMT

Hello dejans,

thank you for replying.

I think, there is a miss communication.

my question is

how to check that the downloaded full modem update file (.cbor file) is in external flash memory?

best regards

praveen

RE: how to verify after writing to external FLASH memory during full modem update (FOTA).

dejans — Mon, 20 Mar 2023 14:12:31 GMT

Hi,

There is configuration option CONFIG_FMFU_FDEV_SKIP_PREVALIDATION which skips the prevalidation of the modem firmware. You can find it in the code available online. The verification of the modem firmware signature is done using nrf_modem_bootloader_verify() which is described in API documentation.

Best regards,
Dejan