On Fri, 2009-09-18 at 09:31 +0000, Sumesh Kaana wrote: > > > Hi, > > > I am trying to boot linux kernel (2.6.30) on PPC440x5 processor in a > custom built board. I am using simple ppc platform. > > > I have a small bootloader which will only copy the > simpleImage.myboard.bin to 0x400000 location of my SRAM from the > flash. > > > SRAM is only 16MB and bootloader creates one and only TLB of 16MB >
The 440 kernel is meant to be run from memory physical address 0 in main memory. It's not capable of relocating itself there, so I wouldn't be surprised that this is the source of your problem. Ben. > I am getting "Kernel access of bad area, sig: 11 [#1]" while kernel is > booting. > > > kernel crashes in different places, for different compilation > > > Bellow given are 2 dumps of kernel crash > > > In DUMP1, in back trace, execution flow is shown like, > > > Start_kernel() --> sort_main_extable() --> sort_extable(). and sort > extable calls some functions whose name is not mentioned. > > > Why is it not able to get the name of the function.? > > > i went through the 'objdump' of the kernel, I don't know whether it > can help me somehow, it looked like this > > > -- > c018c730: 48 00 71 9d bl c01938cc <sort_main_extable> > c018c734: 48 00 3e 3d bl c0190570 <trap_init> > -- > c01938e8: 4b f7 10 f1 bl c01049d8 <sort_extable> > c01938ec: 80 01 00 14 lwz r0,20(r1) > -- > c01049fc: 48 00 8d 99 bl c010d794 <sort> > c0104a00: 80 01 00 14 lwz r0,20(r1) > -- > c016b99c: 42 6f 6f 74 bc+ 18,4*cr3+so,c0172910 > <kallsyms_token_index+0x7400> > -- > > > Could this be problem with "kallsyms"..? Because sort_extable() calls > sort() which is an exported function defined in linux-2.6.30\lib > \sort.c > > > when i checked 'objdump' of the kernel, i could see the usage of a > preserved opcode of ppc440x5 (code: eciwx). > > > I tried compiling the kernel with "kallsyms" disabled, that also did > not work. > > > In DUMP2, backtrace is not able to identify the name of 'caller' of > unflatten_device_tree(). The caller is mentioned as "[00000000] > (null)" > > > Could this be a stack problem, like stack pointer getting corrupted.? > > > At last, could this be a hardware problem(expecting to be memory > problem)..? > > > Can you tell me if i am missing something.? > > > thanks, > Shyju. N > > > > > -------------------------DUMP 1------------------------------------ > id mach(): done > MMU:enter > MMU:hw init > MMU:mapin > MMU:setio > MMU:exit > bootmemarch: exit > <7>Top of RAM: 0x1000000, Total RAM: 0x1000000 > Zone PFN ranges: > DMA 0x00000000 -> 0x00001000 > Normal 0x00001000 -> 0x00001000 > Movable zone start PFN for each node > early_node_map[1] active PFN ranges > 0: 0x00000000 -> 0x00001000 > MMU: Allocated 1088 bytes of context maps for 255 contexts > Built 1 zonelists in Zone order, mobility grouping off. Total pages: > 4064 > Kernel command line: console=ttyS0 root=/dev/ram > Unable to handle kernel paging request for data at address 0x00021000 > Faulting instruction address: 0xc010a7c4 > Oops: Kernel access of bad area, sig: 11 [#1] > PREEMPT PowerPC 44x Platform > Modules linked in: > NIP: c010a7c4 LR: c010dc50 CTR: 00000000 > REGS: c01bfeb0 TRAP: 0300 Not tainted (2.6.30) > MSR: 00021000 <ME,CE> CR: 24000044 XER: 00000000 > DEAR: 00021000, ESR: 00000000 > TASK = c01a94b8[0] 'swapper' THREAD: c01be000 > GPR00: 00001180 c01bff60 c01a94b8 00021000 00000025 00000008 c0104968 > 00000000 > GPR08: 2f72616d c0110000 c0155938 c01a0000 22000024 00000000 fffff104 > 00000000 > GPR16: 00000000 00000000 00000000 00000000 fffffff8 000008b8 c010d758 > c0104968 > GPR24: 00001198 00001190 c018a001 c01c5498 000008c0 00001188 00021000 > c01c42f0 > NIP [c010a7c4] strchr+0x0/0x3c > LR [c010dc50] match_token+0x138/0x228 > Call Trace: > [c01bff60] [c016b99c] 0xc016b99c (unreliable) > [c01bffa0] [c0104a00] sort_extable+0x28/0x38 > [c01bffb0] [c01938ec] sort_main_extable+0x20/0x30 > [c01bffc0] [c018c734] start_kernel+0x140/0x288 > [c01bfff0] [c0000200] skpinv+0x190/0x1cc > Instruction dump: > 7ca903a6 88040000 38a5ffff 38840001 2f800000 98090000 39290001 > 419e0010 > 4200ffe4 98a90000 4e800020 4e800020 <88030000> 5484063e 7f802000 > 4d9e0020 > ---[ end trace 31fd0ba7d8756001 ]--- > Kernel panic - not syncing: Attempted to kill the idle task! > Call Trace: > [c01bfd90] [c0005d5c] show_stack+0x4c/0x16c (unreliable) > [c01bfdd0] [c002f17c] panic+0xa0/0x168 > [c01bfe20] [c0032eb8] do_exit+0x61c/0x638 > [c01bfe60] [c000b60c] kernel_bad_stack+0x0/0x4c > [c01bfe90] [c000f310] bad_page_fault+0x90/0xd8 > [c01bfea0] [c000e184] handle_page_fault+0x7c/0x80 > [c01bff60] [c016b99c] 0xc016b99c > [c01bffa0] [c0104a00] sort_extable+0x28/0x38 > [c01bffb0] [c01938ec] sort_main_extable+0x20/0x30 > [c01bffc0] [c018c734] start_kernel+0x140/0x288 > [c01bfff0] [c0000200] skpinv+0x190/0x1cc > Rebooting in 180 seconds.. > ------------------------------------------------------------------- > > > -------------------------DUMP 2------------------------------------ > id mach(): done > MMU:enter > MMU:hw init > MMU:mapin > MMU:setio > MMU:exit > <1>Unable to handle kernel paging request for data at address > 0x40ee8053 > Faulting instruction address: 0xc018ff44 > Oops: Kernel access of bad area, sig: 11 [#1] > PREEMPT PowerPC 44x Platform > Modules linked in: > NIP: c018ff44 LR: c018ff20 CTR: 00000000 > REGS: c01bfe10 TRAP: 0300 Not tainted (2.6.30) > MSR: 00021000 <ME,CE> CR: 44088024 XER: 00000000 > DEAR: 40ee8053, ESR: 00800000 > TASK = c01a94b8[0] 'swapper' THREAD: c01be000 > GPR00: c0ffea58 c01bfec0 c01a94b8 c0ffea6e c04eb3aa 00000003 c0ffea74 > 00000000 > GPR08: 00000000 40ee802f c04eb3a0 c01bfec8 24082022 00000000 fffff104 > 00000000 > GPR16: 00000000 c016cfe8 c016cfd8 c0170cbc c01bfec8 c0ffea24 c04eb3a4 > c04eb3a0 > GPR24: 00000008 c01bff8c c04eb33c c0ffea2c 00000007 c01bff88 c0ffe984 > c0ffea6d > NIP [c018ff44] unflatten_dt_node+0x158/0x520 > LR [c018ff20] unflatten_dt_node+0x134/0x520 > Call Trace: > [c01bff20] [c019023c] unflatten_dt_node+0x450/0x520 > [c01bff80] [c01903b4] unflatten_device_tree+0xa8/0x13c > [c01bffb0] [00000000] (null) > Instruction dump: > 7f85e378 7ec4b378 4be81b55 81390000 381b002c 93690000 90190000 > 4192001c > 813e0028 93db001c 2f890000 419e03b4 <93690024> 937e0028 387b0034 > 3abb0014 > ---[ end trace 31fd0ba7d8756001 ]--- > Kernel panic - not syncing: Attempted to kill the idle task! > Call Trace: > [c01bfcf0] [c0005d5c] show_stack+0x4c/0x16c (unreliable) > [c01bfd30] [c002f17c] panic+0xa0/0x168 > [c01bfd80] [c0032eb8] do_exit+0x61c/0x638 > [c01bfdc0] [c000b60c] kernel_bad_stack+0x0/0x4c > [c01bfdf0] [c000f310] bad_page_fault+0x90/0xd8 > [c01bfe00] [c000e184] handle_page_fault+0x7c/0x80 > [c01bfec0] [00000000] (null) > [c01bff20] [c019023c] unflatten_dt_node+0x450/0x520 > [c01bff80] [c01903b4] unflatten_device_tree+0xa8/0x13c > [c01bffb0] [00000000] (null) > ------------------------------------------------------------------- > > > > > > > > > ______________________________________________________________________ > Let us find your next place for you! 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