[lkml]   [2004]   [Aug]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Help with mapping memory into kernel space?
On Tue, 2004-08-17 at 22:39 -0700, Brian McGrew wrote:
> Good day All:


> The overall problem is that the more system memory we install,
> the fewer IBB's we can use. For instance, 256MB lets us use
> four IBB's; 512MB lets us use three IBB's and so on. Basicly,
> the kernel blows up trying to map memory. Each IBB has two
> banks of 64MB of RAM on them which we try and memmap to system
> memory for speed of addressing. So essentaily, we're sending
> out four camera systems with only 256MB of memory which is only
> about one quarter of what we need.

On x86, the kernel has 1 GiB of address space. Try the 2G/2G split
patches, or the 4G/4G patches, either one of which should increase your
kernel address space enough to map both memory and your buffers.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 14:05    [W:0.041 / U:5.632 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site