Reset via NVIC_SystemReset() not working with MCUBoot enabled on nRF5340 custom board

RE: Reset via NVIC_SystemReset() not working with MCUBoot enabled on nRF5340 custom board

Vidar Berg — Thu, 13 Jun 2024 09:33:50 GMT

The SPI NOR driver is only used for interfacing with external SPI NOR Flash ICs, and should not be enabled unless external flash partitions are enabled in the bootloader: Using external flash memory partitions

RE: Reset via NVIC_SystemReset() not working with MCUBoot enabled on nRF5340 custom board

responsible_duck — Wed, 12 Jun 2024 19:30:23 GMT

Good to know thanks. MCUboot is placed in internal flash so it seems with CONFIG_SPI_NOR=y enabled it expects to communicate with internal flash via SPI NOR?

RE: Reset via NVIC_SystemReset() not working with MCUBoot enabled on nRF5340 custom board

Vidar Berg — Wed, 12 Jun 2024 15:06:27 GMT

The SPI_NOR symbol will be selected if you have defined the flash device on one of your SPI buses in the Devicetree. However, I'm not sure why enabling the SPI_NOR driver prevented the bootloader from booting the application. Is the secondary mcuboot placed in internal or external flash? You can run the "memory report" action in VS Code to see the memory layout.

RE: Reset via NVIC_SystemReset() not working with MCUBoot enabled on nRF5340 custom board

responsible_duck — Wed, 12 Jun 2024 14:21:27 GMT

It looks like it is in flash driver Kconfig:

RE: Reset via NVIC_SystemReset() not working with MCUBoot enabled on nRF5340 custom board

Vidar Berg — Tue, 04 Jun 2024 06:16:35 GMT

Thanks for the update. Maybe CONFIG_SPI_NOR is enabled by default for your custom board. MCUBoot should not enable the SPI NOR driver by default.

RE: Reset via NVIC_SystemReset() not working with MCUBoot enabled on nRF5340 custom board

responsible_duck — Mon, 03 Jun 2024 23:26:32 GMT

It turns out that it was getting stuck on reading some CONFIG_SPI_NOR flag so we set it to `n` in `mcuboot.conf`. But not sure why this was blocking bootloading... To be clear we didn't explicitly set `CONFIG_SPI_NOR=y` before.

RE: Reset via NVIC_SystemReset() not working with MCUBoot enabled on nRF5340 custom board

Vidar Berg — Fri, 31 May 2024 08:20:46 GMT

Hello,

Does your board have external regulators or other components that need to be enabled on startup by the nRF? I'm wondering if there may be something that the bootloader is not enabling, but the application does.

Both NVIC_SystemReset() and pinreset will trigger a system reset. The difference between these reset sources and a full power on reset can be seen from the table in the PS here: Application core reset behavior

Best regards,

Vidar

RE: Reset via NVIC_SystemReset() not working with MCUBoot enabled on nRF5340 custom board

responsible_duck — Fri, 31 May 2024 05:05:42 GMT

Hardware reset line low doesn't work either and only a power cycle works :/