NCS 2.1 + MCUboot + nRF5340 overwriting .noinit areas

RE: NCS 2.1 + MCUboot + nRF5340 overwriting .noinit areas

amo-inv — Mon, 10 Oct 2022 13:24:12 GMT

As far as I understand (but I didn't dig into it), it is used by mcuboot for net core upgrade.

RE: NCS 2.1 + MCUboot + nRF5340 overwriting .noinit areas

amo-inv — Mon, 10 Oct 2022 13:24:10 GMT

As far as I understand (but I didn't dig into it), it is used by mcuboot for net core upgrade.

RE: NCS 2.1 + MCUboot + nRF5340 overwriting .noinit areas

dstude — Mon, 10 Oct 2022 13:21:58 GMT

Thank you. As you noted, can you please let me know what the functionality of the flash simulator is - or what is lost by disabling it?

Also my comment still stands - if this has some critical function and needs to be allocated, I'd like to request it is done with .noinit - outside the .bss - also to avoid such a huge RAM initialization.

RE: NCS 2.1 + MCUboot + nRF5340 overwriting .noinit areas

amo-inv — Mon, 10 Oct 2022 13:20:10 GMT

Hello.

The 256KB buffer is used by Flash simulator driver, automatically enabled by board dts file when a 'flash_sim' is defined. The flash simulator seem to have no use except for mcuboot (to be confirmed), so you can disable it in your project configuration with

CONFIG_FLASH_SIMULATOR=n

You will save 256KB of RAM...

Arnaud.