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From:   Ard Biesheuvel <ardb@kernel.org>
Date:   Wed, 16 Jun 2021 16:21:55 +0200
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Subject: Re: x86 UEFI stub builtin cpio rootfs.
To:     Christian Melki <christian.melki@t2data.com>,
        Arvind Sankar <nivedita@alum.mit.edu>
Cc:     linux-efi <linux-efi@vger.kernel.org>
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(+ Arvind)

On Tue, 15 Jun 2021 at 12:45, Christian Melki
<christian.melki@t2data.com> wrote:
>
> Trying to incorporate a cpio archive but I'm having trouble getting the
> kernel to recognize the builtin archive. No printouts regarding initrd
> at all.
> Does the x86/UEFI stub/arch support builtin cpios? I can't find any
> documentation suggesting otherwise.
> Skimming through the code makes me skeptical however.
>
> What's the state of builin cpio for x86? More spec. for a UEFI stubbed
> kernel?
>

The CPIO rootfs should be independent from the bootloader, UEFI stub,
etc. From the bootloader pov, it is just a part of the image.