Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 8 Nov 2001 12:20:34 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 8 Nov 2001 12:20:24 -0500 Received: from www.transvirtual.com ([206.14.214.140]:35600 "EHLO www.transvirtual.com") by vger.kernel.org with ESMTP id ; Thu, 8 Nov 2001 12:20:18 -0500 Date: Thu, 8 Nov 2001 09:19:30 -0800 (PST) From: James Simmons To: Bakonyi Ferenc cc: linux-kernel@vger.kernel.org Subject: Re: isa_* problems (hgafb is broken since 2.4.13) In-Reply-To: <3BEA64AF.18141.2926868D@localhost> 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 > I have two questions about asm-i386/io.h: > 1. Why #define __ISA_IO_base ((char *)(PAGE_OFFSET)) ? > 2. Why not #define __ISA_IO_base ((char *)0) ? For ix86 the ISA IO space start is at the very begining of memory. On other platforms like the PPC the ISA IO space is seperate from the regular memory space. It starts after the regular memory space thus the __ISA_IO_base will not be 0x0. - 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/