From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <5.1.0.14.2.20020510074516.0229ffe8@falcon.si.com> Date: Fri, 10 May 2002 07:53:14 -0400 To: linuxppc-embedded@lists.linuxppc.org From: Jerry Van Baren Subject: Re: Why system panic after sometimes? In-Reply-To: <20020510113725.CF7FB1195C@denx.denx.de> References: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: Sorry to be replying to a reply, but I inadvertently deleted the first one in this thread... A panic due to a FPM emulation trap is almost always a memory read problem. Your processor is erroneously reading the value 0xFFxxxxxx, which is a floating point instruction. This causes a floating point emulation trap to occur because your 8xx processor doesn't have hardware floating point. Your memory subsystem is not stable. Check the usual suspects: burst cache line reading with marginal UPM parameters is #1, #2, and #3. I would guess that a board design problem is #4 and bad memory is #5. Since you run for longer periods of time, burst cache line reading is less likely in your case (this usually shows up right away, during the boot process of linux). Good luck, you are going to need it :-( gvb At 01:37 PM 5/10/2002 +0200, Wolfgang Denk wrote: >Hello, > >in message <20020510095821.44488.qmail@web15005.mail.bjs.yahoo.com> you wrote: > > > > I am sorry i have not described clear. > > We use HardHat CDK1.2's cross compile. > >This is pretty old, but should work for this purpose. > > > We have not use USB driver yet, I have writed a driver > > for a MPEGI coder chip (operate it via data and > > address bus).I think my driver (just handle interrupts > > from chip) is safe and will not affect kernel > >Well, I think the kernel version you are using is very stable, so >maybe it _is_ a problem in your driver? > > > and i don't know how to decode backtrace? > >See Documentation/oops-tracing.txt in youir LInux kernel source >directory; alternatively, look up the addresses / symbols manually in >the Systems.map file in your kernel directory. > >Wolfgang Denk > >-- >Software Engineering: Embedded and Realtime Systems, Embedded Linux >Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de >You got to learn three things. What's real, what's not real, and >what's the difference." - Terry Pratchett, _Witches Abroad_ > ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/