Thinkpad CD-ROM hotplug with ATA_CAM

[Benjamin Kaduk]

On Fri, 16 Sep 2011, Kevin Oberman wrote:

>
> I fear that BIOS may have some issue. I have a T43 and found that, if
> I booted with the DVD
> installed, atacontrol (this was prior to ATA-CAM) would allow me to
> detach, but if I then
> inserted a hard drive and tried to attach it, the system would lock up.
>
> If I booted with a hard drive in the bay, I could detach, change
> drives, and attach with no
> problems. I don't recall if I could replace the hard drive with a DVD,
> though and I don't have
> physical access to that system ATM. Still, this sounds rather similar
> to what I saw and it
> was unique to the T43. I have had several other ThinkPads, all of
> which allow me to swap
> out the DVD for a different drive including the T520 I am using to
> enter this reply.

It's not entirely clear that this is relevant, but my T400 has very odd 
behavior with the CD drive either disappearing or taking a very long time 
to probe on warm boots.  Linux (or grub?  I don't remember.) also has some 
trouble finding the root device (hard disk) on warm boots, but FreeBSD 
does fine.

-Ben Kaduk