I applied SLES 10SP2 to a Dell PowerEdge 2650 server that had
successfully been running SLES 10 SP1. The system now fails to boot,
beginning with an error message "AC AAC received an unrecognized command
[601]". This occurs with normal or "failsafe" boot.

I have seen what appears to be an identical problem with openSUSE 10.3
on a similar system (PE2650 with PERC3/Di). The system fails to boot
subsequent to installation.

Looks the same as http://bugs.centos.org/view.php?id=2729.

I have _not_ yet updated the PERC BIOS.

Has anyone else encountered the same problem?