RE: USB Firmware update

Yaxit — Mon, 26 Aug 2024 12:01:58 GMT

This sounds a smart solution, I'll look into it, thanks!

RE: USB Firmware update

Vidar Berg — Mon, 26 Aug 2024 11:52:13 GMT

Hello,

The reason for using mcuboot as a second-stage bootloader is typically to enable RoT and make mcuboot upgradable, though this comes at the cost of increased memory footprint and complexity. You can read more about the immutable bootloader at https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/app_dev/bootloaders_dfu/mcuboot_nsib/bootloader.html#immutable-bootloader

Have you considered the MCUBoot serial recovery feature? This enables DFU within the MCUBoot bootloader over USB or UART, removing the need to enable any DFU functionality in the app itself (except for maybe a mechanism to reset into serial recovery mode).

https://github.com/hellesvik-nordic/samples_for_nrf_connect_sdk/tree/main/bootloader_samples/serial_recovery

Best regards,

Vidar