>From: "Julio M. Merino Vidal" <jmmv84@gmail.com>
>Date: 2007/08/29 Wed AM 09:15:24 CDT
>To: Michael Lorenz <macallan@netbsd.org>
>Cc: mrz5149@acm.org, port-mac68k@NetBSD.org
>Subject: Re: Documentation for graphics cards

>On Aug 29, 2007, at 3:13 PM, Michael Lorenz wrote:
>
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>>
>> Hello,
>>
>> On Aug 29, 2007, at 08:23, Michael R. Zucca wrote:
>>
>>> You're in luck if you want to work on the Valkyrie since there  
>>> used to be
>>> some code to support it on the PowerPC based 6300 in mklinux. I  
>>> don't think
>>> there were any HW accelerated ops supported but there was code  
>>> that enabled
>>> use of the CLUT/DAC, get the attached monitor type, and, I think,  
>>> change the
>>> color depth mode.
>>
>> There's a valkyrie driver in the current linux kernel, no need to  
>> go digging:
>> http://fxr.watson.org/fxr/source/drivers/video/valkyriefb.c? 
>> v=linux-2.6
>
>Yeah, I know.  I looked at how to set palette registers there.  But  
>I'd rather keep away from reading GPL code, if possible...

I think the mklinux sources were BSD or MIT licensed. So you're probably OK. It looks like the current linux sources were based off that driver. But, I'm not a lawyer :)