ARM A53 and initial MMU mapping for EL0/1/2/3 ?

Michael Walle michael at
Wed Feb 9 14:05:57 CET 2022

>> The problem I have is that I boot a custom SOC into u-boot and when u-boot tries
>> to boot linux I get an error exception when u-boot calls armv8_switch_to_el2 to enter linux.
> So that means that U-Boot runs in EL3, is that the first and only firmware
> that you run? I think the EL3 part of U-Boot is not widely used and tested
> beyond the very few platforms that use it.

FWIW, the u-boot on the kontron_sl28 (which is a A72 core) is running
in EL3. But it's a layerscape so it might be worth looking in
arch/arm/cpu/armv8/fsl-layerscale/ if there is anything special.


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