Cannot add the EFI Loader to a 64-bit EFI stubbed U-Boot

[Heinrich Schuchardt]

On 4/4/22 18:41, Nicklas Larsson wrote:
> Dear U-Boot community,
>
> I have a default configuration based on 'efi-x86_payload64_defconfig'
> (64-bit EFI stub), to which I want to add the EFI_LOADER.
> In order to do so I also have to enable X86-64 to fulfill the "depends on"
> criterias in EFI_LOADER Kconfig. I'm doing this by setting
> X86_RUN_64BIT via the configuration editor.
>
> This dramatically changes the default generated .config file and executing
> 'make' on top of this leaves me with a number of errors starting with:
>
> [image: image.png]
>
> Trying to resolve it just leads me to another error, and eventually I don't
> understand what to do.
>
> Can someone guide me how to add the EFI Loader to my 64-bit EFI stubbed
> U-Boot? Is it possible?
>
> Tried it on U-Boot master 2022.04-rc4 and the latest from next without
> success.
>
> Thanks,
> Nicklas
>


Dear Simon,

As detailed in
https://u-boot.readthedocs.io/en/latest/develop/uefi/u-boot_on_efi.html?highlight=payload#bit
both the x86 payload currently always runs U-Boot in 32 bit mode. If we
ever wanted the payload started by a 64bit UEFI to boot 64bit software,
we would need the payload itself to run in 64bit mode.

Do you have any plans for this?


@Nicklas:

Could you, please, describe what you need the payload for.

Best regards

Heinrich