linux-kernel - Re: how to limit number of sectors each time

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Message-ID: <48F6DF22.6070009@alcatel-lucent.com>
Date:	Thu, 16 Oct 2008 14:28:50 +0800
From:	gshan <gshan@...atel-lucent.com>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	linux-kernel@...r.kernel.org, bzolnier@...il.com
Subject: Re: how to limit number of sectors each time


>> 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

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