linux-kernel - Re: Linus' laptop and Num lock status

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Message-ID: <45D88D9F.7090705@zytor.com>
Date:	Sun, 18 Feb 2007 09:32:15 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jean Delvare <khali@...ux-fr.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dax Kelson <dax@...ulabs.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: 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
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