linux-kernel - Re: [Qemu-devel] Running linux on qemu omap

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Message-ID: <20190523183623.GB5234@darkstar.musicnaut.iki.fi>
Date:   Thu, 23 May 2019 21:36:23 +0300
From:   Aaro Koskinen <aaro.koskinen@....fi>
To:     Philippe Mathieu-Daudé <philmd@...hat.com>
Cc:     Thomas Huth <thuth@...hat.com>,
        Corentin Labbe <clabbe.montjoie@...il.com>,
        Tony Lindgren <tony@...mide.com>, linux-omap@...r.kernel.org,
        qemu-devel@...gnu.org, linux-kernel@...r.kernel.org,
        Peter Maydell <peter.maydell@...aro.org>
Subject: Re: [Qemu-devel] Running linux on qemu omap

Hi,

On Thu, May 23, 2019 at 02:00:41PM +0200, Philippe Mathieu-Daudé wrote:
> On 5/23/19 1:27 PM, Thomas Huth wrote:
> > On 22/05/2019 20.19, Aaro Koskinen wrote:
> >> On Wed, May 22, 2019 at 11:33:41AM +0200, Corentin Labbe wrote:
> >>> qemu-system-arm -M help |grep OMAP
> >>> cheetah              Palm Tungsten|E aka. Cheetah PDA (OMAP310)
> >>> n800                 Nokia N800 tablet aka. RX-34 (OMAP2420)
> >>> n810                 Nokia N810 tablet aka. RX-44 (OMAP2420)
> >>> sx1                  Siemens SX1 (OMAP310) V2
> >>> sx1-v1               Siemens SX1 (OMAP310) V1
> >>>
> >>>>> The maximum I can get with omap1_defconfig is
> >>>>> qemu-system-arm -kernel zImage -nographic -machine cheetah -append 'root=/dev/ram0 console=ttyO0'
> >>>>> Uncompressing Linux... done, booting the kernel.
> >>>>> then nothing more.
> >>
> >> With N800/N810 omap2plus_defconfig should be used instead. However,
> >> I don't think that works either (but haven't tried recently). Also with
> >> N800/N810 you need to append the DTB file to the kernel image.
> > 
> > FWIW, Philippe recently posted a mail how to run older kernels on n810:
> > 
> > https://www.mail-archive.com/qemu-devel@nongnu.org/msg610653.html

So it seems the issue with N8x0 is that serial console does not work.
And we are missing the display support in the mainline kernel.

> However I can see than none of the board listed by Corentin are tested
> ... That reminder me I never succeed at using the Cheetah PDA. So the
> OMAP310 is probably bitroting in QEMU...

Cheetah works with serial console. I tried with console on display,
and it seems to boot up, and the frame buffer window gets correctly
sized but for some reason it just stays blank.

A.