linux-kernel - Re: [PATCH -mm] video: uvesafb: Add X86 dependency.

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Date:	Tue, 11 Sep 2007 13:19:57 +0100
From:	Paulo Marques <pmarques@...popie.com>
To:	Paul Mundt <lethal@...ux-sh.org>,
	Paulo Marques <pmarques@...popie.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Januszewski <spock@...too.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm] video: uvesafb: Add X86 dependency.

Paul Mundt wrote:
> On Tue, Sep 11, 2007 at 12:41:49PM +0100, Paulo Marques wrote:
>>[...]
>> Why do you say that it's x86 specific? Am I missing something?
>>
> The emulator it uses only runs on x86 and x86_64. Thus, it's x86
> specific. The v86d and uvesafb pages seem to be in disagremeent, unless
> by 'non-x86' it's only implying x86_64.
> 
> Additionally, it needs the vga I/O routines, as per vgacon. Most
> platforms don't define these.

I just saw the v86d emulator code, and you're right. It mmaps /dev/mem 
and assumes the video BIOS is mapped there.

We should try to change that to mmap something like 
"/sys/bus/pci/devices/0000:01:00.0/rom" instead so that it can work on 
any system with a video card plugged on a PCI bus.

It should also be possible for the emulator to translate in/out 
instructions to appropriate memory mapped I/O equivalents, no?

Anyway, I think it is up to Michal to decide if we should remove the 
kernel support for other archs, or let it stay a bit more while working 
on solving the v86d side of things. So I'll just step aside now....

-- 
Paulo Marques - www.grupopie.com

"667: The neighbor of the beast."
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