linux-kernel - Re: libsata doesn't like bus without master

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Message-id: <45CF54C7.7050400@shaw.ca>
Date:	Sun, 11 Feb 2007 11:39:19 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Patrick Ale <patrick.ale@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: libsata doesn't like bus without master

Patrick Ale wrote:
> Something unrelated to the tests I am doing.
> 
> I found out that the libsata driver doesn't really cope or likes the
> idea that you might have a controller without a master drive
> configured.
> 
> In this case on ATA2 I have a CDROM drive, connected as slave.
> ATA: abnormal status 0x7F on port 0x177
> ATA: abnormal status 0x7F on port 0x177
> ata2.01: ATAPI, max UDMA/66
> ata2.01: configured for UDMA/66

Having a single drive on the channel configured as slave is not really a 
legal configuration. (I believe the ATA standards say that it's 
something that a host controller/driver/OS is allowed to support, but it 
is not required to.) A single drive should always be set to master (and 
connected to the end of the cable and not the middle, by the way).

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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