[1720] in linux-scsi channel archive
wierd philips scsi cdrom drive
daemon@ATHENA.MIT.EDU (Paul Mackerras)
Fri Apr 18 02:24:26 1997
Date: Fri, 18 Apr 1997 16:15:25 +1000
From: Paul Mackerras <paulus@cs.anu.edu.au>
To: linux-scsi@vger.rutgers.edu
Reply-to: Paul.Mackerras@cs.anu.edu.au
I've got Linux running on a Power Computing Powerbase 180 (not mine,
it belongs to a friend), and I'm having an unusual problem with the
SCSI CDROM during the scsi probing at startup. It's a Philips drive,
but I don't have the model number at present. We are running
linux-2.1.24.
What happens is this: we send a test-unit-ready command (00) which
works fine; we get back a command-complete message and a "good" status
(0). Then we send an inquiry command (0x12). The cdrom accepts the
command, doesn't transfer any data, but immediately returns a
command-complete message and a status byte of 0x12, which is not a
value defined in the scsi-2 standard. The scsi mid-level driver gets
confused by this, of course, and prints messages like "Internal error
scsi.c line 1672" and "status byte = 9". This happens whether or not
there is a CD in the drive. I tried changing the code to make it
retry, but the same behaviour just kept occurring, so it's not a
matter of the drive needing time to get its act together.
Has anyone seen this sort of behaviour before, or does anyone know
what the 0x12 status value means?
Paul.
