On Wed, Sep 28, 2022 at 10:34 AM Johnnie Peters <
[email protected]> wrote:
> I am trying to figure out how to build a Unified kernel image to boot on
> aarch64 based systems. After much googling as Yocto build errors occur,
> I have found some information. After much searching and trying I think I
> am close. I now have this WKS file:
>
> part /boot --source bootimg-efi
> --sourceparams="loader=grub-efi,create-unified-kernel-image=true,initrd=${INITRAMFS_IMAGE}-${MACHINE}.${INITRAMFS_FSTYPES}"
>
> --active --align 4096 --use-uuid
> part / --source rootfs --fstype=ext4 --align 4096 --use-uuid
>
> bootloader --timeout=0 --append="console=ttyAMA0,115200n8"
>
>
> However, I am still missing a piece. I get the error message:
>
> ERROR: Unified Kernel Image EFI stub not found, exiting
>
> This is coming from the scrips/lib/wic/plugins/source/bootimg-efi.py
> file. I added a couple of additional prints to get more info:
>
>
> deploy_dir = get_bitbake_var("DEPLOY_DIR_IMAGE")
> print("2 kernel_dir ", kernel_dir)
> efi_stub = glob("%s/%s" % (deploy_dir, "linux*.efi.stub"))
> print("2 efi_stub ", efi_stub)
> if len(efi_stub) == 0:
> raise WicError("Unified Kernel Image EFI stub not
> found, exiting")
>
> The additionial debug shows the glob() function did not find a file
> matching "linux*.efi.stub" in tmp/deploy/images/xxx. Which actually
> does not exist.
>
> After much googling and then grepping in the Yocto meta directories I
> have not found any reference so far on how to generate the .efi.stub
> file. I thought there may be an intermediary file somewhere in the
> build/tmp directory but no luck.
>
> Does anybody have pointers on this file? If not is there a suggestion
> for a more appropriate list to ask on?
>
As far as I know, it is only generated by 'systemd-boot' :
https://git.yoctoproject.org/poky/tree/meta/recipes-core/systemd/systemd-boot_251.4.bb#n56
And is consumed by, for instance, the 'uefi-comboapp.bbclass' in meta-intel:
https://git.yoctoproject.org/meta-intel/tree/classes/uefi-comboapp.bbclass#n28
UEFI is still fairly new to arm platforms, so many of us are still getting
used to how it works. The meta-arm folks might be able to say more.
> Thanks for any info,
>
> Johnnie Peters
>
>
>
>
>
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