From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161509AbXDXWBw (ORCPT ); Tue, 24 Apr 2007 18:01:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161172AbXDXWBw (ORCPT ); Tue, 24 Apr 2007 18:01:52 -0400 Received: from gherkin.frus.com ([192.158.254.49]:45682 "EHLO gherkin.frus.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161023AbXDXWBv (ORCPT ); Tue, 24 Apr 2007 18:01:51 -0400 Subject: old ISA DMA bug in 2.6.12? To: linux-kernel@vger.kernel.org Date: Tue, 24 Apr 2007 17:01:46 -0500 (CDT) CC: linux-scsi@vger.kernel.org X-Mailer: ELM [version 2.4ME+ PL82 (25)] MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII Message-Id: <20070424220146.2EA64DBA1@gherkin.frus.com> From: rct@gherkin.frus.com (Bob Tracy) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org I was enjoying yet another session of beating my head against the wall trying to do useful things with old hardware :-), and managed to cause a kernel panic by simply trying to mount a cdrom in the context of a DSL-N installation. The SCSI host adapter is an Adaptec AHA-1542B, and when I try to mount a cdrom, I manage to run afoul of the BAD_DMA() check in aha1542.c: the buffer returned is not in the lower 16 MB of memory. The same 2.6.12 kernel + hardware combination works fine as long as I confine my I/O to the hard disk that's also attached to the AHA-1542B. -- ----------------------------------------------------------------------- Bob Tracy WTO + WIPO = DMCA? http://www.anti-dmca.org rct@frus.com -----------------------------------------------------------------------