How to do Firmware upgrade(U-boot, kernel, rootfs) for Var-som-solo/dual IMX6 board

[robertferanec]

Maybe this may give you some ideas how uboot update could be done:

https://www.imx6rex.com/software/how-to-uboot-compile-flash-update/#update_uboot

[shripal_k]

Hi,

I want to do a firmware upgrade that includes u-boot, kernel and rootfs using a USB stick. This means on plugging the USB stick should automatically update the firmware. For kernel and rootfs I am copying the images into a temporary location and using the A/B update strategy. But I am not able to find a method to update U-Boot. I can't use a bootable sd-card for this. Is it okay if I directly erase the U-boot partition and copy the new U-boot into that partition will it cause any problem? Is it feasible to do like this? Which other modules will get affected if I erase the U-Boot while system is running.

Sorry for this long question.
Thanks in advance.