linux-kernel - Re: [U-Boot] [v4 PATCH] RISCV: image: Add booti support

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Message-ID: <20190506212709.GD31207@bill-the-cat>
Date:   Mon, 6 May 2019 17:27:09 -0400
From:   Tom Rini <trini@...sulko.com>
To:     Heinrich Schuchardt <xypron.glpk@....de>
Cc:     Karsten Merker <merker@...ian.org>,
        Atish Patra <atish.patra@....com>,
        linux-kernel@...r.kernel.org, Alexander Graf <agraf@...e.de>,
        Anup Patel <anup@...infault.org>,
        Bin Meng <bmeng.cn@...il.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Joe Hershberger <joe.hershberger@...com>,
        Lukas Auer <lukas.auer@...ec.fraunhofer.de>,
        Marek Vasut <marek.vasut@...il.com>,
        Michal Simek <michal.simek@...inx.com>,
        Rick Chen <rick@...estech.com>, Simon Glass <sjg@...omium.org>,
        u-boot@...ts.denx.de
Subject: Re: [U-Boot] [v4 PATCH] RISCV: image: Add booti support

On Mon, May 06, 2019 at 11:10:57PM +0200, Heinrich Schuchardt wrote:
> On 5/6/19 10:39 PM, Karsten Merker wrote:
> >On Mon, May 06, 2019 at 10:06:39PM +0200, Heinrich Schuchardt wrote:
> >>On 5/6/19 8:11 PM, Atish Patra wrote:
> >>>This patch adds booti support for RISC-V Linux kernel. The existing
> >>>bootm method will also continue to work as it is.
> >[...]
> >>>+	"boot arm64/riscv Linux Image image from memory", booti_help_text
> >>
> >>%s/Image image/image/
> >>
> >>"arm64/riscv" is distracting. If I am on RISC-V I cannot boot an ARM64
> >>image here. Remove the reference to the architecture, please.
> >
> >Hello,
> >
> >I'm not sure about the last point - ISTR (please correct me if my
> >memory betrays me here) that an arm64 U-Boot can in principle be
> >used to boot either an arm64 or an armv7 kernel, but the commands
> >are different in those cases (booti for an arm64 "Image" format
> >kernel and bootz for an armv7 "zImage" format kernel), so having
> >the information which kernel format is supported by the
> >respective commands appears useful to me.  If the arm64 kernel
> >image format would have a distinctive name (like "zImage" on
> >armv7 or "bzImage" on x86) that would be less problematic, but
> >with the confusion potential of "boot a Linux Image" (as in the
> >arm64/riscv-specific "Image" format) vs "boot a Linux image" (as
> >in generally some form of kernel image), I think explicitly
> >mentioning the supported architectures makes sense.
> 
> In this case you have to ensure that only the *supported* architectures
> are mentioned. RISC-V is not supported on ARM64.

The help should be re-worded to be both architecture agnostic and clear
that it is for the Linux Kernel 'Image' format images.

-- 
Tom

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