lkml.org 
[lkml]   [2003]   [Aug]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [OT] Documentation for PC Architecture
> > I've done some tests with a simple kernel which I wrote: all that region 
> > (except video memory at 0xb8000) results "read only"...
>
> because it is usually designated as rom area, which naturally
> is read only ...

On some boards I've seen, there is 384K onboard for ROM shadowing
purposes, and when only 128K is actually used, (as it is in a lot of
configurations), the other 256K is available as system memory.

However, this on-board 256K is only remapped when you have 8 MB RAM or
less on the board. So with 8 MB the board reports 8448K of RAM, but
with 16 MB, it only reports 16384K. In that case 256K of real RAM is,
indeed, lost.

John.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:47    [W:0.065 / U:0.160 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site