linux-kernel - Re: [PATCH V9 20/24] LoongArch: Add efistub booting support

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Date:   Sat, 14 May 2022 10:27:21 +0800
From:   Huacai Chen <chenhuacai@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     WANG Xuerui <kernel@...0n.name>, Ard Biesheuvel <ardb@...nel.org>,
        Huacai Chen <chenhuacai@...ngson.cn>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Yanteng Si <siyanteng@...ngson.cn>,
        Guo Ren <guoren@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH V9 20/24] LoongArch: Add efistub booting support

Hi, Arnd,

On Sat, May 14, 2022 at 3:33 AM Arnd Bergmann <arnd@...db.de> wrote:
>
> On Fri, May 6, 2022 at 3:20 PM Huacai Chen <chenhuacai@...il.com> wrote:
> > On Fri, May 6, 2022 at 7:41 PM Arnd Bergmann <arnd@...db.de> wrote:
> > >
> > > Agreed. I think there can be limited compatibility support for old
> > > firmware though, at least to help with the migration: As long as
> > > the interface between grub and linux has a proper definition following
> > > the normal UEFI standard, there can be both a modern grub
> > > that is booted using the same protocol and a backwards-compatible
> > > grub that can be booted from existing firmware and that is able
> > > to boot the kernel.
> > >
> > > The compatibility version of grub can be retired after the firmware
> > > itself is able to speak the normal boot protocol.
> > After an internal discussion, we decide to use the generic stub, and
> > we have a draft version of generic stub now[1]. I hope V10 can solve
> > all problems. :)
> > [1] https://github.com/loongson/linux/tree/loongarch-next-generic-stub
>
> Can you post v19 to the list? As we have resolved the question on clone()
> now (I hope), and you have a prototype for the boot protocol, it sounds
> like this can make it into v5.19 after all, but we need to be sure that the
> remaining points that Xuerui Wang and Ard Biesheuvel raised are
> all addressed, and there is not much time before the merge window.
>
> I have built a gcc-12.1 based toochain at
> https://mirrors.edge.kernel.org/pub/tools/crosstool/ that now includes
> loongarch64 suport, please point to that in the cover letter for v10
> in case someone wants to start test building.
>
> I will be travelling next week, and won't be able to pull your tree
> into the asm-generic tree during that time, as I had originally planned.
>
OK, thanks, I will send a new version today.

Huacai

> However, you can ask Stephen Rothwell (added to Cc) to add your
> git tree to linux-next once you think that you have addressed all of the
> remaining review comments, and posted the same version to the
> list. This will allow others to more easily test your tree in combination
> with the other work that has been queued for the 5.19 release.
>
> If there are no new show-stoppers, I can help you coordinate
> the pull request during the merge window.
>
>          Arnd