Sigmatel Vendor SCSI Commands

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Overview

This page documents the vendor specific SCSI commands used by Sigmatel in their SDK. This mostly applies to the STMP37xx/I.MX233 series but some of it can also apply to the STMP36xx series. The following devices are known to implement these commands:

Vendor	Device	Protocol
Creative	Zen X-Fi2	6.0
Creative	Zen X-Fi3	6.0
Sandisk	Sansa Fuze+	6.1

Protocol Overview

The protocol works as follows. All commands are sent as vendor specific SCSI commands. The Command Data Block (CDB) usually consists of 10 bytes. The first byte is always 0xC0 for read commands are 0xC1 for write commands. The second byte is the actually command. The third byte is usually a tag or a type or an ID. The following commands are known to exist:

Command	Type	Value
GET PROTOCOL VERSION	Read	00
GET LOGICAL MEDIA INFO	Read	02
GET LOGICAL TABLE	Read	05
ALLOCATE LOGICAL MEDIA	Write	06
ERASE LOGICAL MEDIA	Write	07
GET LOGICAL DRIVER INFO	Read	12
READ LOGICAL DRIVE SECTOR	Read	13
SET LOGICAL DRIVE INFO	Write	20
WRITE LOGICAL DRIVE SECTOR	Write	23
ERASE LOGICAL DRIVE	Write	2F
GET CHIP MAJOR REV ID	Read	30
CHIP RESET	Write	31
GET CHIP SERIAL NUMBER	Read	32
GET ROM REV ID	Read	37
GET JANUS STATUS	Read	40
INITIALIZE JANUS	Write	41
RESET TO RECOVERY	Write	42
INITIALIZE DATA STORE	Write	43
RESET TO UPDATER	Write	44
GET DEVICE INFO	Read	45

Get Protocol Version

Response
Offset	Length	Value	Comment
0	1	xx	Major version
1	1	yy	Minor version

Note: we don't really know what is minor and the major version and we don't know if it's really useful.

-- AmauryPouly - 11 Dec 2012