From: gshan <gshan@alcatel-lucent.com>
To: Jens Axboe <jens.axboe@oracle.com>
Cc: linux-kernel@vger.kernel.org, bzolnier@gmail.com
Subject: Re: how to limit number of sectors each time
Date: Thu, 16 Oct 2008 14:28:50 +0800 [thread overview]
Message-ID: <48F6DF22.6070009@alcatel-lucent.com> (raw)
In-Reply-To: <20081016062503.GT19428@kernel.dk>
>> 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
next prev parent reply other threads:[~2008-10-16 6:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-16 3:29 how to limit number of sectors each time gshan
2008-10-16 5:44 ` Jens Axboe
[not found] ` <48F6DA7A.9080003@alcatel-lucent.com>
[not found] ` <20081016061808.GS19428@kernel.dk>
2008-10-16 6:21 ` gshan
2008-10-16 6:25 ` Jens Axboe
2008-10-16 6:28 ` gshan [this message]
2008-10-17 16:47 ` Bartlomiej Zolnierkiewicz
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