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In trying to track down potential ram issues, I was messing
around with different devices. I have a ram chip, 32meg on the bus of a
at91rm9200. Is there a way to view the ram memory? When I try cat
/dev/mem, I get a bad virtual address and segmentation fault. When I try a cat /dev/ram0 , the cursor will blink like it
is working and I can see that the kernel hasn’t crashed. Eventually,
it fails as well, but on a null virtual address. I have the output below
and have cut it short so as to not include too much. Can someone tell me
if this is normal and if it isn’t, what could be the cause of it (setup
issue with kernel etc). I am running 2.6.20, with the AT91 patches. # cat /dev/ram0 <1>Unable to handle kernel NULL pointer dereference at
virtual address 00000000 [ 459.880000] pgd = c1f5c000 [ 459.880000] [00000000] *pgd=21f44031, *pte=00000000,
*ppte=00000000 [ 459.880000] Internal error: Oops: 17 [#2] [ 459.880000] Modules linked in: [ 459.880000] CPU: 0 [ 459.880000] PC is at __wake_up_common+0x30/0xbc [ 459.880000] LR is at __wake_up+0x40/0x6c [ 459.880000] pc :
[<c003f460>] lr : [<c00404e4>]
Not tainted [ 459.880000] sp : c1f5bcf0 ip : c1f5bd20
fp : c1f5bd1c [ 459.880000] r10: 00000003 r9 : c1f5bd40
r8 : 00000000 [ 459.880000] r7 : 00000001 r6 : c0000070
r5 : a0000013 r4 : c1f5a000 [ 459.880000] r3 : 00000000 r2 : 00000001
r1 : fffffff4 r0 : 00000000 [ 459.880000] Flags: nzcv IRQs off FIQs
on Mode SVC_32 Segment user [ 459.880000] Control: C000717F [ 459.880000] Table: 21F5C000 DAC: 00000015 [ 459.880000] Process cat (pid: 256, stack limit =
0xc1f5a258) [ 459.880000] Stack: (0xc1f5bcf0 to 0xc1f5c000) [ 459.880000]
bce0:
0000002c c1f5a000 a0000 013 c0335144 |
