ok I think I found the problem I have with exception. It would appear that for some reason the vector 0x500 gets assigned the UnkownException handler instead of external_interrupt when I look at the end label in memory. The last two values are the same and will be the offset to UnknownException

488: 03fc3bc8 48c: 03fc319c

588: 03fc3bc8 58c: 03fc319c

Any idea what may be broken here.?

-----Original Message----- From: u-boot-users-admin@lists.sourceforge.net [mailto:u-boot-users-admin@lists.sourceforge.net]On Behalf Of Barbier, Renaud (GE Infrastructure) Sent: Friday, September 03, 2004 2:49 PM To: Ralph Siemsen Cc: u-boot-users@lists.sourceforge.net Subject: RE: [U-Boot-Users] ppc440gx

that is what I am looking for but TSR and TCR are always cleared. the interrupt should not come unless...

-----Original Message----- From: u-boot-users-admin@lists.sourceforge.net [mailto:u-boot-users-admin@lists.sourceforge.net]On Behalf Of Ralph Siemsen Sent: Friday, September 03, 2004 2:26 PM To: Barbier, Renaud (GE Infrastructure) Cc: u-boot-users@lists.sourceforge.net Subject: Re: [U-Boot-Users] ppc440gx

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

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