From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: David Daney <ddaney@caviumnetworks.com>,
IDE/ATA development list <linux-ide@vger.kernel.org>
Subject: Re: ata_pio_need_iordy vs. CF spec. V4.1
Date: Mon, 24 Nov 2008 22:02:46 +0300 [thread overview]
Message-ID: <492AFA56.9010508@ru.mvista.com> (raw)
In-Reply-To: <20081124174521.491e727b@lxorguk.ukuu.org.uk>
Alan Cox wrote:
>>Table 22 on page 51 of CF Specification Rev. 4.1 indicates that iordy is
>>not supported in PIO5 and PIO6. This seems to be in conflict with the
>>code in ata_pio_need_iordy, which asserts that it is mandatory in any
>>mode greater than PIO2.
>>Which is correct? Or am I misreading something?
> The ATA spec says that modes > PIO2 requires IORDY
> The CFI spec does indeed say PIO5/6 do not use IORDY so probably you
> should tweak that function at least for CFA devices.
Only for them because there probably used to be PIO5 hard disks in the
wild and they hardly ignored IORDY...
> Alan
MBR, Sergei
prev parent reply other threads:[~2008-11-24 19:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-24 17:40 ata_pio_need_iordy vs. CF spec. V4.1 David Daney
2008-11-24 17:45 ` Alan Cox
2008-11-24 19:02 ` Sergei Shtylyov [this message]
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