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List: linuxppc-embedded
Subject: Re: PPC exception 0x320
From: Becky Bruce <Becky.Bruce () freescale ! com>
Date: 2006-05-30 17:01:46
Message-ID: D5C7D869-D248-4712-A900-1FBA620DAECC () freescale ! com
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Jeanwelly,
I'd really like to help you here, but you still haven't explained what you mean by \
"PPC alarmed exception 0x320". Since there is no such exception that I'm aware of \
on the 750, I'm trying very hard to figure out what you mean, and it's impossible \
for me to do that without more information from you. I need to know exactly what \
it is that you're seeing in order to help you. If the kernel is printing out a \
message, please include the *entire message* in your email. Are you getting a \
message that says "Bad trap at PC: ....."? A quick mini-tutorial on PPC exceptions: \
Whenever hardware detects an exception condition, the hardware starts executing at a \
vector location for that particular exception. On the PPC 750, these exception \
vectors are, for the most part, aligned at multiples of 0x100. There is a list of \
exception vectors and their associated causes in Table 4.2 of the User's manual (see \
below for a URL). Some exceptions are caused by software, and others, like the \
Decrementer Interrupt, are generated by the hardware itself. There is often more \
than one way to cause a particular exception. For example, a DSI exception can be \
caused by a miss in the hardware page table, or by a load to a direct-store segment, \
among other things. *All* of these events will result in running the exception \
vector starting at 0x300 because all of these conditions cause a DSI. Although \
there are multiple causes for DSI, they all go to the same vector address. The \
system software at that address must use methods described in the user's manual to \
determine what kind of DSI exception has occurred so it can handle the fault. While \
the hardware detects the exception, it is the job of the system software to handle \
it. The User's manual for a processor will list the events that hardware will \
detect and cause an exception. You have to look at your system software source code \
to figure out if your operating system supports a given exception. In Linux, this \
code is mostly in arch/ppc/head.S and arch/ppc/traps.c. You can get a copy of the 750 \
User's Manual at: http://www.freescale.com/files/32bit/doc/ref_manual/MPC750UM.pdf
The exception information is in Chapter 4.
Cheers,Becky
On May 29, 2006, at 9:22 AM, jeanwelly wrote:
> Hi Becky Bruce,> Sorry for late response. I got mail traffic...>> I encountered the \
> exception 0x320 which caused the PPC card crash. > Based on my understanding, I \
> think exception is a HW behaviour, so > I guess there maybe exist some reference \
> on all the supported > exceptions of some version of PPC. Do you know this?>> My \
> system take that exception as an "unknown exception" and crash > the card. So, I \
> think the exception is from the PPC CPU, but don't > the concrete meanings.>> \
> Appreciate your suggestions.> ---> Jeanwelly>> \
> ---------------------------------------->>> Is there some error message you can \
> show me?>>>> -B>>>> On Apr 25, 2006, at 10:03 AM, jeanwelly wrote:>>>>> Hi Becky \
> Bruce,>>> I'm using PPC 750... Just as you said, 0x300 is for DSI, and I>>> guess \
> they are a set of exceptions, not just one. And 0x320 is one>>> of them.>>> I got a \
> board crash, and PPC alarmed exception 0x320. Could you>>> show me the mechanism of \
> handling of a special exception not one >>> set.>>> >>>>>> ======= 2006-04-25 \
> 02:53:35 您在来信中写道：=======>>>>>>> Could you try to be more specific? \
> What processor do you have, >>>> what>>>> linux version are you running, and what \
> do you mean exactly when >>>> you>>>> say you "encountered PPC exception 0x320"? \
> As far as I know, the>>>> powerpc architecture does not define an exception 0x320. \
> 0x300 is>>>> usually DSI on classic powerpc parts. BookE parts handle things>>>> \
> differently.>>>>>>>> Thanks,>>>> -Becky>>>>>>>> On Apr 24, 2006, at 8:51 AM, \
> jeanwelly wrote:>>>>>>>>> Hi,>>>>> I encountered PPC exception 0x320, but don't \
> know what it for. Any>>>>> one could help me on this?>>>>> Thanks!>>>>> \
> >>>>>>>>>> jeanwelly>>>>> \
> > > > > > > > > > > jeanwelly@126.com>>>>> \
> > > > > > > > > > > 2006-04-24>>>>> \
> > > > > > > > > > > _______________________________________________>>>>> \
> > > > > > > > > > > Linuxppc-embedded mailing list>>>>> \
> > > > > > > > > > > Linuxppc-embedded@ozlabs.org>>>>> \
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