lkml.org 
[lkml]   [2000]   [Oct]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: K7 on SD11 and 2.2.17: memory not detected
On Wed, Oct 11, 2000 at 12:01:23PM -0500, Sudhindra Herle wrote:
> > The BIOS E801 memory reporting is buggy on a lot of these
> > boards. Since the
> > vendors dont appear to care you probably want to pass
> > mem=383M or mem=384M
> > depending if the BIOS uses top of memory for stuff on boot
>
> How would one know if the BIOS uses the upper MB of memory? I poked around
> in the BIOS and most of the "shadow" and "cacheable" things are disabled.

If the BIOS has ACPI support, it uses some blocks in the upper MB of
memory.

> Also, is there someone maintaining a list of such known bugs for
> CPU+motherboard combo? If there is no-one, I'll be happy to maintain the
> list.

If you do, put the IBM ThinkPad 600X on it: BIOS e820 memory reporting
is broken, and the machine puts its ACPI tables at the top of memory,
so you have to use "mem=(installed - 1)M" to use it or otherwise the
first ACPI event crashes the system.


Erik

--
J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department
of Electrical Engineering, Faculty of Information Technology and Systems,
Delft University of Technology, PO BOX 5031, 2600 GA Delft, The Netherlands
Phone: +31-15-2783635 Fax: +31-15-2781843 Email: J.A.K.Mouw@its.tudelft.nl
WWW: http://www-ict.its.tudelft.nl/~erik/
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:39    [W:0.035 / U:3.852 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site