Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755142AbYJPG33 (ORCPT ); Thu, 16 Oct 2008 02:29:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752465AbYJPG3V (ORCPT ); Thu, 16 Oct 2008 02:29:21 -0400 Received: from cnmailgate04.alcatel-sbell.com.cn ([211.144.215.47]:54830 "EHLO cnshjsmin03.cn.alcatel-lucent.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752397AbYJPG3V (ORCPT ); Thu, 16 Oct 2008 02:29:21 -0400 X-AuditID: ac189297-a8f7dbb000000fe5-2e-48f6df1254ca Message-ID: <48F6DF22.6070009@alcatel-lucent.com> Date: Thu, 16 Oct 2008 14:28:50 +0800 From: gshan User-Agent: Thunderbird 1.5.0.10 (X11/20070221) MIME-Version: 1.0 To: Jens Axboe CC: linux-kernel@vger.kernel.org, bzolnier@gmail.com Subject: Re: how to limit number of sectors each time References: <48F6B51B.2000408@alcatel-lucent.com> <20081016054400.GN19428@kernel.dk> <48F6DA7A.9080003@alcatel-lucent.com> <20081016061808.GS19428@kernel.dk> <48F6DD54.70004@alcatel-lucent.com> <20081016062503.GT19428@kernel.dk> In-Reply-To: <20081016062503.GT19428@kernel.dk> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 16 Oct 2008 06:28:37.0994 (UTC) FILETIME=[6C7404A0:01C92F58] X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1001 Lines: 32 >> I'm using IDE driver instead of HD driver. >> I dumped out IO registers and PRD table. Note that maxinum allowed sector number has been decreased from 256 to 32. hdc: dma_timer_expiry: dma status == 0x21 ========IDE Register DUmp======== DMA start sector: 0x007d5fb5 DMA sectors : 0x0020 Data Reg : 0x00 Error Reg : 0x00 Nsector Reg : 0x19 Sector Reg : 0xbc LCYL Reg : 0x5f HCYL Reg : 0x7d Select Reg : 0xe0 Status Reg : 0x58 Control Reg : 0x58 IRQ Reg : 0x58 ======Physical Region Descriptor======= Base_PRD: 0x0189f000 Current_PRD: 0x0189f008 Entries:3 index=0 base=0x00204d1c lengh=0x00100000 index=1 base=0x00604c1c lengh=0x00200000 index=2 base=0x00304d1c lengh=0x00100080 -- 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/