Re: X server through the xsrc sets on PowerBook G4 with NVidia card

[Michael <macallan%netbsd.org@localhost>]

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Hello,

On Mar 30, 2010, at 10:50 PM, Taylor R Campbell wrote:

>   Date: Fri, 26 Mar 2010 17:23:32 -0400
>   From: Michael <macallan%netbsd.org@localhost>
>
>   Please check if your kernel's pci_usrreq.c is version 1.16.6.3, or
>   if it's newer than 9/16/2009.
>
> I have just tried this with a new kernel and sets from HEAD at
> <ftp://nyftp.NetBSD.org/pub/NetBSD-daily/HEAD/201003290000Z/>.  I get
> further this time, but launching X still fails.  Here's the tail end
> of Xorg.0.log in a fresh pkg_comp chroot after I run `X':
>
>   (WW) xf86MapVidMem: could not mmap screen [s=10000,a=a0000]  
> (Invalid argument)
>   Fatal server error:
>   AddScreen/ScreenInit failed for driver 0

That looks like the vgahw module trying to map the legacy VGA  
framebuffer - quite useless on macppc even if it was enabled.
There is a hack in the kernel to allow mmap()ing the first 128kB of  
video memory at 0xa0000 - doesn't do any good but it shuts up that  
particular error, enable it with
options GENFB_FAKE_VGA_FB
in your kernel config or keep Xorg from loading vgahw which may  
involve some hacking in the nv driver - basically, all vgahwWhatever()  
calls need to be #ifdef'ed out. They're for saving and restoring VGA  
text mode state ( things like the actual mode used, custom fonts  
etc. ) - since we never use text mode on macppc these calls are a  
waste of time either way.
I don't have any nvidia hardware myself but it may be worth your time  
to check the driver's options for something to disable VGA access /  
using vgahw.

have fun
Michael


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