RED STATE

I have many Sun Ultra-5 units in production. Another unit has recently failed and the symptoms are always the same.

(a) No output on the display.

(b) A RED State Exception loop (see example below) output to serial Port-A.

RED State Exception TT=0000.0000.0000

TL=0000.0000.0000.0005 TT=0000.0000.0000.0010

TPC=0000.0000.f000.4200 TnPC=0000.0000.f000.4204 TSTATE=0000.0044.5600.1500

TL=0000.0000.0000.0004 TT=0000.0000.0000.0010

TPC=0000.0000.f000.4200 TnPC=0000.0000.f000.4204 TSTATE=0000.0044.5600.1500

TL=0000.0000.0000.0003 TT=0000.0000.0000.0010

TPC=0000.0000.f000.4200 TnPC=0000.0000.f000.4204 TSTATE=0000.0044.5600.1500

TL=0000.0000.0000.0002 TT=0000.0000.0000.0010

TPC=0000.0000.f000.0200 TnPC=0000.0000.f000.0204 TSTATE=0000.0044.5600.1500

TL=0000.0000.0000.0001 TT=0000.0000.0000.0010

TPC=0000.0000.f000.3a00 TnPC=0000.0000.f000.3a04 TSTATE=0000.0044.5600.0400]

Does anyone have any ideas on this?

[998 byte] By [DerekatADI] at [2007-11-26 9:33:08]

# 1

If you have confidence in your hardware replacement/repair skills,

and if you have two Ultra-5's that have identical speed cpu's in them,

(a healthy one and this failing one)

then take the cpu out of the problem system

and replace it with the known good cpu.

Put the questionable cpu into the known good chassis.

See if the errors follow the hardware.

Recent forum threads have mentioned that Red State Exception errors

are due to failing RAM, but I actually suspect the MMU in the cpu module.

Those computers are getting old and they've served you for many years.

It may just be their "time to go".

This experiment that I've suggested will take all of 30 minutes

from shutdown to reboot, to the return of the cpu's to their original locations.

Let us know how you make out.

rukbat at 2007-7-7 0:20:33 >

Sun Hardware New Topic