From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ralph Siemsen <rsiemsen@rossvideo.com>
Date: Fri, 03 Sep 2004 09:25:36 -0400
Subject: [U-Boot-Users] ppc440gx
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Barbier, Renaud (GE Infrastructure) wrote:

> kgdb: handle_exception; trap [0xb00]
> 
> I am not sure what is the source of this exception. (decrementer should be 0x900)
> 
> Before that I was getting exception 0x500(external interrupt) and trace it to the UIC registers(polarity, trigger,...) being cleared (where?).
> So I restore their value in interrrupt_init_cpu.  

My numbers don't quite agree with yours... but I think you might be 
seeing "Fixed Interval Timer" as the source of the exception.  Sounds 
like you are enabling interrupts before the handlers have been registered.

Just a guess, probably others know better...
-Ralph