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Date: Wed, 12 Oct 2022 09:44:39 +0200
From: "Arnd Bergmann" <arnd@arndb.de>
To: "Thomas Zimmermann" <tzimmermann@suse.de>,
 "Javier Martinez Canillas" <javierm@redhat.com>,
 "David Airlie" <airlied@linux.ie>, "Daniel Vetter" <daniel@ffwll.ch>,
 "Helge Deller" <deller@gmx.de>, maxime@cerno.tech, sam@ravnborg.org,
 "Michal Suchanek" <msuchanek@suse.de>,
 "Michael Ellerman" <mpe@ellerman.id.au>, benh@kernel.crashing.org,
 "Paul Mackerras" <paulus@samba.org>,
 "Geert Uytterhoeven" <geert@linux-m68k.org>, mark.cave-ayland@ilande.co.uk
Subject: Re: [PATCH v4 5/5] drm/ofdrm: Support big-endian scanout buffers
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On Wed, Oct 12, 2022, at 9:40 AM, Thomas Zimmermann wrote:
> Am 12.10.22 um 09:17 schrieb Arnd Bergmann:
>> On Wed, Oct 12, 2022, at 8:46 AM, Thomas Zimmermann wrote:
>
>> Does qemu mark the device has having a particular endianess then, or
>> does it switch the layout of the framebuffer to match what the CPU
>> does?
>
> The latter. On neither architecture does qemu expose this flag. The 
> default endianess corresponds to the host.

"host" as in the machine that qemu runs on, or the machine that is
being emulated? I suppose it would be broken either way, but in the
latter case, we could get away with detecting that the machine is
running under qemu.

    Arnd