Re: ICH9 2 port SATA controller port map?

[Tejun Heo <htejun@gmail.com>]

Gaston, Jason D wrote:
>> -----Original Message-----
>> From: Tejun Heo [mailto:htejun@gmail.com]
>> Sent: Wednesday, September 26, 2007 6:08 PM
>> To: Gaston, Jason D
>> Cc: linux-ide@vger.kernel.org
>> Subject: Re: ICH9 2 port SATA controller port map?
>>
>> Gaston, Jason D wrote:
>>> Hello,
>>>
>>> ICH9 has DeviceID's for 2 port, IDE mode, SATA controllers.  The
> current
>>> port map in ata_piix is setup for the 4 port controllers.  This seems
> to
>>> work ok, but I wonder if a new port map should be defined for the 2
> port
>>> controllers, where the two ports are PM, SM?  You can refer to the
> ICH9
>>> Datasheet on intel.com for detail.
>> Yes, please go ahead and define new entry for the controllers.  Thanks.
>>
>> --
>> Tejun
> 
> What is the difference between NA and RV?  If the controller only has
> access to 2 ports, does it matter which I set the nonexistent port
> values to in the map?

NA is used for unimplemented ports of a valid configuration while RV is
used to mark invalid MAP value.  So, NA should be mixed with P[0-3]
while RV can't be mixed with any other values.

-- 
tejun