From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 1 Aug 2001 16:45:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 1 Aug 2001 16:44:53 -0400 Received: from quark.didntduck.org ([216.43.55.190]:52494 "EHLO quark.didntduck.org") by vger.kernel.org with ESMTP id ; Wed, 1 Aug 2001 16:44:32 -0400 Message-ID: <3B686A1F.B2409245@didntduck.org> Date: Wed, 01 Aug 2001 16:44:15 -0400 From: Brian Gerst X-Mailer: Mozilla 4.76 [en] (WinNT; U) X-Accept-Language: en MIME-Version: 1.0 To: Svein Erling Seldal CC: linux-kernel@vger.kernel.org Subject: Re: readw() access In-Reply-To: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Svein Erling Seldal wrote: > > Hello, > > I'm trying to port a driver from 2.2.x to 2.4.x where I previously has used > readw() to read the contents of the memory-adresses 0x408-0x40c (Where the > BIOS gives you the adr. for the par-ports.) But on 2.4.x readw(0x408) Oops: > > "Unable to handle kernel NULL pointer dereference at virtual address > 00000408" > > How do you read a memory-address like this? > > Svein Erling Seldal Use isa_readw() or ioremap(). -- Brian Gerst