Boot from different partitions based on some condition

Hi,

I want to set up for an upgrade of our embedded system, using a special kernel for the upgrade. The standard will be to load the system from mtd3 (kernel), mtd4 (devicetree) and mtd5 (rootfs).

When an update is to take place I want to run the upgrade system from mtd0.

So basically I need to have some sort of telling U-boot that it should launch the upgrade system instead of the standard system.

Any ideas how I set this up? How to tell u-boot? How to get u-boot to boot from another partition based on a condition like that?

Regards Mats mailto:matsmanhav@tele2.se