linux-kernel - Re: [v3 PATCH] RISC-V: Add a PE/COFF compliant Image header.

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Message-ID: <7hef48ggyd.fsf@baylibre.com>
Date:   Wed, 05 Jun 2019 09:00:42 -0700
From:   Kevin Hilman <khilman@...libre.com>
To:     Atish Patra <atish.patra@....com>, linux-kernel@...r.kernel.org
Cc:     Atish Patra <atish.patra@....com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <Anup.Patel@....com>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        linux-riscv@...ts.infradead.org,
        Nick Kossifidis <mick@....forth.gr>,
        Palmer Dabbelt <palmer@...ive.com>,
        Zong Li <zong@...estech.com>,
        linux-arm-kernel@...ts.infradead.org, mark.rutland@....com,
        marek.vasut@...il.com, catalin.marinas@....com,
        will.deacon@....com, trini@...sulko.com, paul.walmsley@...ive.com
Subject: Re: [v3 PATCH] RISC-V: Add a PE/COFF compliant Image header.

Atish Patra <atish.patra@....com> writes:

> Currently, last stage boot loaders such as U-Boot can accept only
> uImage which is an unnecessary additional step in automating boot flows.
>
> Add a PE/COFF compliant image header that boot loaders can parse and
> directly load kernel flat Image. The existing booting methods will continue
> to work as it is.
>
> Another goal of this header is to support EFI stub for RISC-V in future.
> EFI specification needs PE/COFF image header in the beginning of the kernel
> image in order to load it as an EFI application. In order to support
> EFI stub, code0 should be replaced with "MZ" magic string and res5(at
> offset 0x3c) should point to the rest of the PE/COFF header (which will
> be added during EFI support).
>
> This patch is based on ARM64 boot image header and provides an opprtunity
> to combine both ARM64 & RISC-V image headers.
>
> Tested on both QEMU and HiFive Unleashed using OpenSBI + U-Boot + Linux.
>
> Signed-off-by: Atish Patra <atish.patra@....com>

Tested booti support on HiFive Unleashed using OpenSBI + U-Boot (master
branch) + Linux.

Tested-by: Kevin Hilman <khilman@...libre.com>