Pack of CAM improvements

[Gary Jennejohn]

On Sat, 23 Jan 2010 15:07:47 +0100 (CET)
Juergen Lock <nox at jelal.kn-bremen.de> wrote:

> But what
> this still doesn't fix is the broken `test unit ready' command on ada
> devices, which also makes things like `cdrecord -scanbus' hang the bus. :(
> (A few days ago I also got a hang after wanting to try out xfburn,
> I suspect for the same reason...)
> 
>  Here is my earlier report:
> 	http://docs.freebsd.org/cgi/mid.cgi?20090817163144.GA2991
> 

I started seeing a problem a few days ago with one of my DVD drives (a
burner at cd0) under 9-current, which makes it impossible to use it even
to simply read a DVD.

Here the (rather strange IMO) output in dmesg:

cd0: <HL-DT-ST DVD-RAM GSA-H54N 1.00> Removable CD-ROM SCSI-0 device
cd0: 66.700MB/s transfers (UDMA4, PIO size 65534bytes)
cd0: Attempt to query device size failed: UNIT ATTENTION, Power on, reset,
or bus device reset occurred
cd1 at ata0 bus 0 scbus6 target 1 lun 0
cd1: <TSSTcorp DVD-ROM SH-D162D SB01> Removable CD-ROM SCSI-0 device
cd1: 33.300MB/s transfers (UDMA2, PIO size 65534bytes)
cd1: Attempt to query device size failed: NOT READY, Medium not present -
tray closed

I haven't the foggiest why cd0 behaves diffrently from cd1, which is a
vanilla DVD drive and just works.

---
Gary Jennejohn