Use UMS to Update kernel and resize partition

Enter to UMS (USB Mass Storage) in u-boot on target board

ums 0 mmc 0

The mmc number should correspond to eMMC, it may vary by different platforms.

Check from this command:

mmc list

For PICO-IMX8M:

ums 0 mmc 0

For PICO-IMX8MM/FLEX-IMX8MM

ums 0 mmc 1

Manipulate eMMC as USB mass storage on host PC

lsblk

It's able to replace kernel image and dtb in the 1st FAT partition of eMMC.

Resize partition in eMMC

1. Install partition tool - gparted

sudo apt-get install gparted

2. Execute gparted to resize partition:

sudo gparted /dev/sdX