Hi,Adam,

The problem has been solved, thank you for your supports! Indeed, that fault is caused by cache. In file "pagetable-arch", the code only flush dcache and do not flush icache which leads to this unstable phenomenon. Now, the system seem to ok after I adding it.

Steven Meng

On 2013年03月01日 19:00, l4-hackers-request@os.inf.tu-dresden.de wrote:

On Thu Feb 28, 2013 at 21:33:53 +0800, meng-qy wrote:

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 Thank you for your suggestion!  Following your guidance, I log the PF info when system dead like this:

test 1: pf: 000a pfa=2016a8f8 ip=2016a8f8 (r-) spc=0xf12e475c 144 pf: 000a pfa=2016a8f8 ip=2016a8f8 (r-) spc=0xf12e475c 143 pf: 000a pfa=2016a8f8 ip=2016a8f8 (r-) spc=0xf12e475c 142 pf: 000a pfa=2016a8f8 ip=2016a8f8 (r-) spc=0xf12e475c 141 pf: 000a pfa=2016a8f8 ip=2016a8f8 (r-) spc=0xf12e475c 140 test 2: pf: 000a pfa=20144128 ip=20144128 (r-) spc=0xf12e475c 105 pf: 000a pfa=20144128 ip=20144128 (r-) spc=0xf12e475c 104 pf: 000a pfa=20144128 ip=20144128 (r-) spc=0xf12e475c 103 pf: 000a pfa=20144128 ip=20144128 (r-) spc=0xf12e475c 102 test 3: pf: 000a pfa=2016a8f8 ip=2016a8f8 (r-) spc=0xf12e475c 116 pf: 000a pfa=2016a8f8 ip=2016a8f8 (r-) spc=0xf12e475c 115 pf: 000a pfa=2016a8f8 ip=2016a8f8 (r-) spc=0xf12e475c 114 pf: 000a pfa=2016a8f8 ip=2016a8f8 (r-) spc=0xf12e475c 113 pf: 000a pfa=2016a8f8 ip=2016a8f8 (r-) spc=0xf12e475c 112

  What is spc? pc or sp ? I objdump the image, and did not found that address.

pc is the program counter, sp is the stack pointer, spc is a kernel internal data structure (Space). So this is a code pagefault, likely in the roottask/moe.

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However, we can't get more info in dump file because the file didn't include any symbol table(Can we dump the symbol table by adding some compile option? ).

Use fiasco.image file for the kernel.

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   At last, different from other chip, we found that address
   e0000000-fb000000 in s5pv210 is some important register, and the
   kernel seem to map that address, it doesn't matter?

What you describe are physical addresses, the kernel uses virtual ones, i.e. the virtual address does not point to the physical address. So yes, it does not matter.

Adam -- Adam adam@os.inf.tu-dresden.de Lackorzynski http://os.inf.tu-dresden.de/~adam/

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