lkml.org 
[lkml]   [2007]   [Feb]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Linus' laptop and Num lock status
Jean Delvare wrote:
> On Thu, 15 Feb 2007 06:34:35 -0800, H. Peter Anvin wrote:
>> Jean Delvare wrote:
>>> On x86, the BIOS led state can be read from byte 0x97 the BIOS RAM. The
>>> BIOS RAM is mapped at 0x400 so all we need to do is to one byte from
>>> RAM (offset 0x497). This is how Suse's hwinfo does.
>> Perhaps that's what Suse does, but the proper address is 0x417.
>>
>> 0x497 is the rarely-used LPT2 timeout counter.
>
> Still, the information printed by hwinfo is correct, I've tested it
> myself. Is there some publicly available documentation about the x86
> BIOS RAM mapping?
>

Google for Ralf Brown's Interrupt List.

-hpa
-
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: 2007-02-18 18:35    [W:0.072 / U:0.384 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site