Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751800AbXBRR7v (ORCPT ); Sun, 18 Feb 2007 12:59:51 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751797AbXBRR7v (ORCPT ); Sun, 18 Feb 2007 12:59:51 -0500 Received: from agminet01.oracle.com ([141.146.126.228]:52678 "EHLO agminet01.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751801AbXBRR7u (ORCPT ); Sun, 18 Feb 2007 12:59:50 -0500 Date: Sun, 18 Feb 2007 09:54:27 -0800 From: Randy Dunlap To: Jean Delvare Cc: "H. Peter Anvin" , Linus Torvalds , Dax Kelson , linux-kernel Subject: Re: Linus' laptop and Num lock status Message-Id: <20070218095427.b533b0c8.randy.dunlap@oracle.com> In-Reply-To: <20070218170401.286e0fc6.khali@linux-fr.org> References: <1171479361.3706.48.camel@mentorng.gurulabs.com> <20070214202144.1ddb930f.khali@linux-fr.org> <45D46F7B.3060105@zytor.com> <20070218170401.286e0fc6.khali@linux-fr.org> Organization: Oracle Linux Eng. X-Mailer: Sylpheed 2.3.1 (GTK+ 2.8.10; x86_64-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Whitelist: TRUE X-Whitelist: TRUE X-Brightmail-Tracker: AAAAAQAAAAI= Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1356 Lines: 36 On Sun, 18 Feb 2007 17:04:01 +0100 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? Hilo, 0x40:0x17 is called "keyboard control" and 0x40:0x97 is called "keyboard LED flags" in the IBM Personal System/2 and Personal Computer BIOS Interface Technical Reference, Section 3: Data Areas and ROM Tables. /bios data areas tables/ :: http://heim.ifi.uio.no/~stanisls/helppc/bios_data_area.html http://heim.ifi.uio.no/~stanisls/helppc/kb_flags.html --- ~Randy *** Remember to use Documentation/SubmitChecklist when testing your code *** - 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/