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Message-ID: <494CF231.4020000@ru.mvista.com> Date: Sat, 20 Dec 2008 16:25:05 +0300 From: Sergei Shtylyov <sshtylyov@...mvista.com> To: Robert Hancock <hancockr@...w.ca> Cc: linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] ide: Fix ata_id_has_dword_io to return DWORD I/O support properly 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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