Wolfgang Denk wrote: >In message <4459B1CF.60909 at 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.
