linux-kernel - Re: [PATCH V11 09/22] LoongArch: Add boot and setup routines

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Date:   Tue, 24 May 2022 18:59:50 +0800
From:   Huacai Chen <chenhuacai@...il.com>
To:     Xi Ruoyao <xry111@...111.site>, lichao@...ngson.cn
Cc:     Huacai Chen <chenhuacai@...ngson.cn>,
        Arnd Bergmann <arnd@...db.de>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Airlie <airlied@...ux.ie>,
        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>,
        LKML <linux-kernel@...r.kernel.org>,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Yanteng Si <siyanteng@...ngson.cn>,
        Guo Ren <guoren@...nel.org>, Xuerui Wang <kernel@...0n.name>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        linux-efi <linux-efi@...r.kernel.org>,
        Ard Biesheuvel <ardb@...nel.org>
Subject: Re: [PATCH V11 09/22] LoongArch: Add boot and setup routines

Hi, Ruoyao,

On Tue, May 24, 2022 at 4:27 PM Xi Ruoyao <xry111@...111.site> wrote:
>
> On Wed, 2022-05-18 at 17:26 +0800, Huacai Chen wrote:
> > Currently an existing interface between the kernel and the bootloader
> > is  implemented. Kernel gets 2 values from the bootloader, passed in
> > registers a0 and a1; a0 is an "EFI boot flag" distinguishing UEFI and
> > non-UEFI firmware, while a1 is a pointer to an FDT with systable,
> > memmap, cmdline and initrd information.
>
> If I understand this correctly, we can:
>
> - set a0 to 0
> - set a1 a pointer (virtual address or physical address?) to the FDT
> with these information
>
> in the bootloader before invoking the kernel, then it will be possible
> to boot this kernel w/o firmware update?
Unfortunately, there is no released firmware for you since we recently
changed the interface again and again. :(
You can contact with Li Chao (lichao@...ngson.cn), I think he can
provide help as much as possible (at least provide temporary firmwares
for developers).
We will also provide qemu-system and virtual machine's firmware as
soon as possible.

Huacai

>
> I'd prefer to receive a firmware update anyway, but we need an
> alternative if some vendor just say "no way, our customized distro works
> fine and you should use it".  (I'm not accusing LoongArch: such annoying
> behavior is common among vendors of all architectures, and even worse
> with x86 because they often say "just use Windoge".)
> --
> Xi Ruoyao <xry111@...111.site>
> School of Aerospace Science and Technology, Xidian University