Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 14 Mar 2002 12:09:07 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 14 Mar 2002 12:08:58 -0500 Received: from naxos.pdb.sbs.de ([192.109.3.5]:46559 "EHLO naxos.pdb.sbs.de") by vger.kernel.org with ESMTP id ; Thu, 14 Mar 2002 12:08:46 -0500 Date: Thu, 14 Mar 2002 18:11:42 +0100 (CET) From: Martin Wilck To: Linux Kernel mailing list Subject: IO delay, port 0x80, and BIOS POST codes Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hello, the BIOS on our machines (Phoenix) uses IO-port 0x80 for storing POST codes, not only during sytem startup, but also for messages generated during SMM (system management mode) operation. I have been told other BIOSs do the same. Unfortunately we can't read this information because Linux uses port 80 as "dummy" port for delay operations. (outb_p and friends, actually there seem to be a more hard-coded references to port 0x80 in the code). It seems this problem was always there, just nobody took notice of it yet (at least in our company). Sometimes people wondered about the weird POST codes displayed in the LCD panel, but who cares once the machine is up... Would it be too outrageous to ask that this port number be changed, or made configurable? Martin -- Martin Wilck Phone: +49 5251 8 15113 Fujitsu Siemens Computers Fax: +49 5251 8 20409 Heinz-Nixdorf-Ring 1 mailto:Martin.Wilck@Fujitsu-Siemens.com D-33106 Paderborn http://www.fujitsu-siemens.com/primergy - 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/