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

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Hello.

Robert Hancock 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?

TTBOM, depending on what's driven by device on -IOCS16, this will translate into 2, 3, or 4 cycles at the successive addresses. In case of the IDE data register, this should translate into one 16-bit cycle at 0x1x0, one 8-bit cycle at 0x1x1, and one 8-bit cycle at 0x1x2 which is of course not what anybody would want...

WBR, Sergei


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