[U-Boot] u-boot fall-back application

[Florin Cotofan]

Hi,
Is it possible to have a standalone application started without the user
intervention (auto-started at power-on)?
I need to create a fall-back application which will boot a safe kernel if
booting a user flashed kernel fails. We will store 2 kernel images in
flash and if one of them is corrupted we need u-boot to try booting the
second one.
How can I test if a kernel image is corrupted?

Regards,
Florin