From: Gautam Borad <gautam@eisodus•com>
To: linuxppc-embedded@ozlabs•org
Subject: Re: frequent sig 11 with malloc() on mpc8xx
Date: Fri, 05 May 2006 14:13:05 +0530 [thread overview]
Message-ID: <445B1019.9010103@eisodus.com> (raw)
In-Reply-To: <20060504144605.B18B3353BE7@atlas.denx.de>
Wolfgang Denk wrote:
>In message <4459B1CF.60909@eisodus•com> you wrote:
>
>
>>We are having a frequent sig 11 problem on our custom mpc852t board
>>with linux kernel 2.6.14 and U-boot version 1.1.3
>>
>>
>That's a FAQ.
>
>
>
>>I had the same problem with 2.4 kernel and after posting the problem
>>
>>
>This confirms that the FAQ matches your problem. See
>http://www.denx.de/wiki/view/DULG/LinuxCrashesRandomly
>
>
>
Thanks for the reply. We have checked the cpu sdram settings and would
re-check the sdram initialization sequence.
However the problem faced is following:
The sig. 11 is generated at a specific instance of accessing memory
areas in
range of 0x00000024 - 0x000000C8 (i.e low address range).
AFAIK this is assigned to kernel area.
We have a ptrintk in arch/ppc/mm/fault.c which shows the frequent page
fault
and its recovery from the fault, however as soon as the DAR loads
0x00000024
or such low address we get a sig. 11.
Bad emulation malloctest/657
NIP: 30000c10 instruction: 00000000 opcode: 0 A: 0 B: 0 C: 0 code: 0 rc: 0
pte @ 0x30000c10: (0xc1d3b300)->(0xc020f000)->0x01c2b889
RPN: 01c2b PP: 2 SPS: 1 SH: 0 CI: 0 v: 1
Kernel VA for NIP c1c2bc10 pte @ 0xc1c2bc10: no pmd
Oops: kernel access of bad area, sig: 11 [#1]
NIP: C00286C8 LR: C0186684 SP: C02CDCA0 REGS: c02cdbf0 TRAP: 0300 Not
tainted
MSR: 00001032 EE: 0 PR: 0 FP: 0 ME: 1 IR/DR: 11
DAR: 00000000, DSISR: C2000000
<======== here the DAR is 0x00000000
TASK = c1d0e070[657] 'malloctest' THREAD: c02cc000
We have tested the SDRAM in both U-boot (mtest) and linux, and the tests
doesnt show anything
wrong with the SDRAM.
thanks in advance.
next prev parent reply other threads:[~2006-05-05 8:38 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-04 7:48 frequent sig 11 with malloc() on mpc8xx Gautam Borad
2006-05-04 14:46 ` Wolfgang Denk
2006-05-04 15:46 ` David Jander
2006-05-05 8:43 ` Gautam Borad [this message]
2006-05-05 9:40 ` Wolfgang Denk
2006-05-05 14:00 ` Gautam Borad
2006-05-05 14:17 ` Mark Chambers
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