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Message-ID: <46BB2A49.5090503@oracle.com>
Date: Thu, 09 Aug 2007 10:52:57 -0400
From: Chuck Lever <chuck.lever@...cle.com>
To: Alan Cox <alan@...rguk.ukuu.org.uk>
CC: linux-kernel@...r.kernel.org
Subject: Re: DMA CRC errors with SiS chipset and notebook drive
Alan Cox wrote:
>> Aug 9 07:41:29 monet kernel: ata1.00: limiting speed to UDMA/66:PIO4
>> Aug 9 07:41:29 monet kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr
>> 0x0 action 0x2
>> Aug 9 07:41:29 monet kernel: ata1.00: (BMDMA stat 0x64)
>> Aug 9 07:41:29 monet kernel: ata1.00: cmd
>> c8/00:08:fb:7c:a1/00:00:00:00:00/e0 tag 0 cdb 0x12 data 4096 in
>> Aug 9 07:41:29 monet kernel: res
>> 51/84:00:00:00:00/00:00:00:00:00/e0 Emask 0x10 (ATA bus error)
>> Aug 9 07:41:29 monet kernel: ata1: soft resetting port
>> Aug 9 07:41:29 monet kernel: ata1.00: configured for UDMA/66
>> Aug 9 07:41:29 monet kernel: ata1.01: configured for UDMA/33
>> Aug 9 07:41:29 monet kernel: ata1: EH complete
>
> Drops to UDMA33 for 40 wire cable.
It drops from UDMA/100 to UDMA/66 for the disk, but stays at UDMA/33 for
the optical drive. If I have only the disk on that controller, the disk
still drops to UDMA/66.
> Looks to me like your cabling is out of spec or you have electrical noise
> problems.
I've tried different cabling solutions, including round and flat IDE
cables. What might cause "electrical noise"? Are 44-40 pin adapters
reliable?
View attachment "chuck.lever.vcf" of type "text/x-vcard" (291 bytes)
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