Emulex QT13 hangs (Was: CMD fixes in 11?)

On Sat, May 02, 2026 at 09:37:10AM -0400, Dave McGuire wrote:
> > Does it still hang on -11?
> > 
> > If so, can you perhaps point me to a bug entry or a mailing list post
> > that describes the problem in more detail?
> 
>   I was finally able to get to this.  It still hangs in -11 RC3.  Again it's
> an Emulex QT13, not a CMD controller.  The machine is a 4000-705A.
> Everything runs fine otherwise.

Can elaborate a bit how the problem with the Emulex QT13 manifests
itself? The QT13 can be configured to do TMSCP or to be compatible with
a TSV05, but I presume your's is configured to do TMSCP. Do you have
tape drive connected to it?

The CMD MSCP problem was caused by /boot setting up QBus mappings for
the controller it was booted from, and the kernel clearing them without
the controller being reset before doing so. This lead to a firmware
lockup in the controller, so it wouldn't respond to the kernel driver
anymore. None of this happened when booting from a different controller
(such as from the net), because then the MSCP controller remained
inactive until first accessed by the kernel driver. The system didn't
hang in either case.


Hans


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