From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: Issues with SIS 964 chipset on SATA Date: Thu, 17 Feb 2005 03:26:04 -0500 Message-ID: <4214551C.8030109@pobox.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Received: from parcelfarce.linux.theplanet.co.uk ([195.92.249.252]:52971 "EHLO parcelfarce.linux.theplanet.co.uk") by vger.kernel.org with ESMTP id S262182AbVBQI0Y (ORCPT ); Thu, 17 Feb 2005 03:26:24 -0500 In-Reply-To: Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Gary Poppitz Cc: linux-ide@vger.kernel.org, Jens Axboe Gary Poppitz wrote: > We tracked down a problem with the 964 chipset with a 0x180 ID code that > may save someone on the list some time. > > The chip will only transfer multiples of 4 bytes. Anything else will > cause it to hang. After further research, this is popping up on a number of chips (and worked around in several vendor drivers). It looks like I will need to do a workaround for all SATA ATAPI devices: if the transfer is not a multiple of 4 bytes, pad it with an DMA 1-3 byte DMA segment. Jeff