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From:   Kevin Hilman <khilman@baylibre.com>
To:     Atish Patra <atish.patra@wdc.com>, linux-kernel@vger.kernel.org
Cc:     Atish Patra <atish.patra@wdc.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Anup Patel <Anup.Patel@wdc.com>,
        Jonathan Corbet <corbet@lwn.net>, linux-doc@vger.kernel.org,
        linux-riscv@lists.infradead.org,
        Nick Kossifidis <mick@ics.forth.gr>,
        Palmer Dabbelt <palmer@sifive.com>,
        Zong Li <zong@andestech.com>,
        linux-arm-kernel@lists.infradead.org, mark.rutland@arm.com,
        marek.vasut@gmail.com, catalin.marinas@arm.com,
        will.deacon@arm.com, trini@konsulko.com, paul.walmsley@sifive.com
Subject: Re: [v3 PATCH] RISC-V: Add a PE/COFF compliant Image header.
In-Reply-To: <20190523183516.583-1-atish.patra@wdc.com>
References: <20190523183516.583-1-atish.patra@wdc.com>
Date:   Wed, 05 Jun 2019 09:00:42 -0700
Message-ID: <7hef48ggyd.fsf@baylibre.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Atish Patra <atish.patra@wdc.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@wdc.com>

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

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