From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 1 Dec 2000 07:07:50 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 1 Dec 2000 07:07:41 -0500 Received: from mx1.port.ru ([194.67.23.32]:42250 "EHLO mx1.port.ru") by vger.kernel.org with ESMTP id ; Fri, 1 Dec 2000 07:07:31 -0500 From: "Guennadi Liakhovetski" To: linux-kernel@vger.kernel.org Subject: Re[3]: DMA for triton again... Mime-Version: 1.0 X-Mailer: mPOP Web-Mail 2.19 X-Originating-IP: 143.167.4.62 via proxy [143.167.1.16] Reply-To: "Guennadi Liakhovetski" Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Message-Id: Date: Fri, 01 Dec 2000 14:36:57 +0300 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi > will try tonight... and will let you know tomorrow... ... Nop, it didn't work. Mike and everybody having experience / knowledge of Western Digital Caviar AC21600H... If you compare WD's documents at: http://www.westerndigital.com/service/FAQ/dtr.html and http://www.westerndigital.com/products/non-current/drives/ac21600.html they, respectively ,say: UDMA if CCC is A8-AG (AH is not UDMA), D5-D7, Bx, or Cx All others -- PIO Mode 4 and 16.6 MB/s (burst Mode 4 PIO) * 16.6 MB/s (burst Mode 2 DMA) ** 33.3 MB/s (Mode 2 Ultra DMA) *** *Max PIO burst rate is specified at 16.6 MB/s using the IORDY signal. **Max DMA and multi-word DMA burst rate is specified using the DMARQ and DMACK signals. ***Mode 2 Ultra DMA is supported in the following firmware revisions (CCC Codes: A8, AA, AC, AD, AG, D5, D6, D7, Bx, Cx). Which one is true? Do non-UDMA AC21600H (I've got CCC F6) support DMA? Is it possible to find out where hdparm -d1 is stopped? Maybe by compiling it with -g and debugging... As far as I understand, BIOS is not an issue, since ide.txt says, that Linux doesn't use BIOS when working with hard drives... Thanks Guennadi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/