Understanding the CPU number scheme in an E450
and finding the  bad CPU if the system fails reboot.
A bad cpu may cause a RED STATE EXCEPTION panic.      

The order of CPU installation is not the same as the way the O/S numbers the CPUs.
O/S probes the UPA slots from top to bottom (UPA slot 1=TOP 4=BOTTOM)

UPA slot 1 = CPU 0  J0101
UPA slot 2 = CPU 1  J0201
UPA slot 3 = CPU 2  J0301
UPA slot 4 = CPU 3  J0401

If the system panics on bootup or keeps rebooting with RED STATE EXCEPTION 
and a CPU is a suspect disable one CPU at a time.

At the ok prompt:
ok setenv upa-port-skip-list <CPU#>
ok boot

Once the Failing CPU is found the system should boot up with the CPU
disabled. When the  CPU is replaced set the NVRAM variable back to original setting.
ok setenv upa-port-skip-list none