Re: [PATCH] RESEND: SCSI, libata: add support for ATA_16 commands to libata ATAPI devices

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Douglas Gilbert wrote:
It is the ATAPI _transport_ that has the 12 byte cdb
limit *** (at least according to MMC-5 rev Annex A;
is S-ATAPI any better?).

Then the spec is wrong.

1) The transport does not limit the CDB size.

2) The ATAPI device limits the CDB size, and it exports this limit via IDENTIFY PACKET DEVICE. It can be either 12 or 16 bytes.

3) In some rare cases, the host controller silicon may limit CDB size.

	Jeff


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