Loading M4 Firmware from root file system

Technical Support
, ,
1

We are trying to load the M4 firmware (.elf-File) from the linux root file system. To achive that, we modified the u-boot environement variable ‘m4Boot’:

setenv m4boot ‘ubi part ubi; ubifsmount ubi0:rootfs1; ubifsload ${loadaddr} /opt/Firmware_M4/FirmwareM4.elf; bootaux ${loadaddr}; ubifsumount’

This is generally working, but every few boot-ups, u-Boot can not mount the rootfs (returning error -19 or error -30).Sometimes the bootfails completely and the OS has to be reinstalled.

What is the correct way to load and start the M4 firmware from the rootfs?

Best regards,
Simon

2

It’s not recommended to mount UBI_FS based RootFS by U_boot.
Better to keep existing boot scenario (load it from dedicated UBI partition without any FS).
If you need to modify an M4 firmware from Linux you ca use a ubiupdatevol command as described here - FreeRTOS on the Cortex-M4 of a Colibri iMX7 | Toradex Developer Center