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Hello,

> I've been trying for a while to get XFree86 running on my iMacDV. I 
> keep encountering the following error:
>
> xf86MapVidMem: could not mmap screen [s=20000,a=a0000] (Invalid 
> argument)
>
> I thought a native xsrc recompile would fix this... nope. I was 
> hopeing someone else with an iMac with an ati rage 128 video card 
> would be kind enough to send me their working XF86Config.
>
> Let me know if I should post my dmesg or anything...

That's the 86 in XFree86. Stupid driver tries to mmap the VGA 
framebuffer to do some textmode status savine ( pointless on a mac 
anyway ).
add
options OFB_FAKE_VGA_FB
to your kernel config to get around this.

have fun
Michael
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