Kontron AM4530 - Manual (Page 40)

27 AM453x
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4.5.2 Upgrading from Linux
Before upgrading, make sure nobody is accessing the root file system during the upgrade. To upgrade all
components(uboot + kernel + rootfs) from Linux, follow the procedure below :
Download a single image to the /tmp folder (using TFTP, SCP, or NFS). For example (all.img is the upgrade
image and 192.168.100.1 is the address where is located the upgrade file):
# cd /tmp
# tftp -g -r all.img 192.168.100.1
Execute the 'all_update' script :
# all_update /tmp/all.img
Reset the board and boot from the second SPI flash :
# update
Note:
The current SPI flash is not modified. The new file image is programmed on the other flash and after
the reset, the CPU will boot on the other flash.