Re: [RFC] mode pages for ATA/ATAPI devices via libata

[Douglas Gilbert <dougg@torque.net>]

Doug Maxey wrote:
> ahem, the neural pathways are not just worn, they have become ruts. =) 
> 
> s/mode/vpd/.
> 
> On Wed, 11 May 2005 13:01:25 CDT, Doug Maxey wrote:
> 
>>Howdy,
>>
>>When a ATA/ATAPI device is attached via libata, what should the handling 
>>be for mode pages that do not exist in the device?
>>
>>Assuming the page being asked for is 0x83, should libata fake up the
>>page from the IDENTIFY (PACKET) DEVICE data?  Or should it just respond
>>there is no page 0x83 as it does now in INQUIRY?  Likewise for 0x80?

Doug,
For ATAPI, the packet interface is almost always
carrying a SCSI command set (exceptions anybody??),
typically MMC (for CD/DVD drives). Recent SPC-3 drafts
(to which MMC-4,5 should comply) have made the device
identification VPD page (0x83) mandatory. I haven't
seen any compliance yet (or for that matter a drive that
implements feature 0x108: LU serial number).

For ATA, work is being done on a SCSI-ATA Translation
draft standard see:
http://www.t10.org/ftp/t10/drafts/sat/sat-r03.pdf
section 8.1.3.3 .

Doug Gilbert