vesafb problem with 1GB Ram and possible fix

[Walt H <waltabbyh@comcast.net>]

I've got a Chaintech 7KDD dual processor 760MPX MB with 1 GB RAM. I had 
   problem getting vesafb or rivafb to work. I got ioremap errors during 
nitialization, which appear to be because vesafb tries to ioremap the 
entire 128MB framebuffer of my video card. It's a GeForce 4 Ti4600 with 
128MB Ram. Through correspondence on the general linux-kernel mailing 
list, I learned about changing the vmalloc reserved space from 128 to 
256MB, but that didn't work for me as it evidently blows away high-mem IO.

Well, here's what I've done. I've made a change in video/vesafb.c to
change __init vesafb_init to only allocate the amount of memory required 
  for the requested video mode of the framebuffer (I think). So far, it 
appears to work fine. I haven't tried many modes yet, but it's worked 
with what I've thrown at it. Thanks again,

The trivial change I made was changing this:

video_size	= screen_info.lfb_size * 65536;

to this:

video_size	= screen_info.lfb_width * screen_info.lfb_height * video_bpp;


I'm not a kernel hacker, so if I'm overlooking something please let me 
know. I've tested this a fair amount and it appears to be working on my 
end. Please CC me on any replies. Thanks,

-Walt




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