set the upa-noprobe-list to 0
at the OK prompt....
OK setenv upa-noprobe-list 0
OK reset-all
That's it, all 4 cpu's should now show up with psrinfo or prtdiag.
NOTE:
Depending on the version of OBP on an e450, the upa-noprobe-mask
variable may be named differently. It may be seen in one of the
following forms.
upa-noprobe-list
upa-noprobe-mask
and on the latest versions of OBP it is a hidden variable
.upa-noprobe-mask
You will need to use printenv -a at the OK prompt to see this
variable with the most current version of OBP. Although the
name of the variable has changed a couple of times, it's function
remains the same.