linux-kernel - Re: [PATCH] x86/Documentation: explain LINUX_EFI_INITRD_MEDIA

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Message-ID: <CAMj1kXFtdqN+cDVVWK1KTbfyfe0kazHt1t1XmPz58uf+axknOg@mail.gmail.com>
Date: Thu, 11 Sep 2025 14:49:49 +0200
From: Ard Biesheuvel <ardb@...nel.org>
To: Hugo Osvaldo Barrera <hugo@...nothugo.nl>
Cc: Bagas Sanjaya <bagasdotme@...il.com>, 
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, 
	Linux Documentation <linux-doc@...r.kernel.org>, Linux EFI <linux-efi@...r.kernel.org>, 
	Jonathan Corbet <corbet@....net>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86/Documentation: explain LINUX_EFI_INITRD_MEDIA_GUID

On Thu, 11 Sept 2025 at 13:23, Hugo Osvaldo Barrera <hugo@...nothugo.nl> wrote:
>
>
>
> On Thu, 11 Sep 2025, at 08:46, Ard Biesheuvel wrote:
> > On Wed, 10 Sept 2025 at 03:58, Bagas Sanjaya <bagasdotme@...il.com> wrote:
> >>
> >> From: Hugo Osvaldo Barrera <hugo@...nothugo.nl>
> >>
...
> >> +For sample implementations, refer to `the original u-boot implementation`_ or
> >> +`the implementation in candyboot`_.
> >> +
> >> +.. _the original u-boot implementation: https://github.com/u-boot/u-boot/commit/ec80b4735a593961fe701cc3a5d717d4739b0fd0
> >> +.. _the implementation in candyboot: https://git.sr.ht/~whynothugo/candyboot/tree/4097b2538d7f1cf85f03922bf42409490b666202/item/src/main.rs#L225
> >>
> >
> > What is candyboot, and why are we adding this plug for it into the
> > Linux documentation?
>
> It's a UEFI stub loader which can load the Linux kernel and provide it with an
> initramfs using the above described protocol.
>
> The original version of this patch was based on my notes researching _how_
> to implement this stub loader. The implementation is quite minimal, so I think
> it serves as a useful reference example.
>

I think one example reference is sufficient, and I think piggybacking
a plug of your own project onto a documentation refactoring patch is
slightly dodgy, to be completely honest.

Where is candyboot used, and what does it add to the existing u-boot
reference, which is the most widely used EFI implementation after EDK2
for non-x86 systems? If anything, we should be referring to the OVMF
implementation here.