linux-kernel - Re: [PATCH] ide: Fix ata_id_has_dword_io to return DWORD I/O support properly

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Message-ID:  <494C512B.6090304@shaw.ca>
Date:	Fri, 19 Dec 2008 19:58:03 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	linux-kernel@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject:  Re: [PATCH] ide: Fix ata_id_has_dword_io to return DWORD I/O   support
 properly

Alan Cox wrote:
>> This seems like a risky assumption...
> 
> Its wrong on various counts
> 
> - ata_id_major_version can't tell early ATA versions apart
> - on anything later than the early ISA IDE paddles (the ones that
> basically were just bus decoders) its invisible to the drive
> 
> Except for legacy ISA bus controllers (and even there it is questionable)
> I would favour simply ignoring it.

32-bit IO wouldn't work on any ISA controller, would it? What happens if 
you do 32-bit IO port access on something on the ISA bus?

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