Hi,
I am booting my linux kernel via NFS.
Here is my environment:
CPU:Motorola ppc8245
Linux version 2.6.14
gcc version 3.3.3 (DENX ELDK 3.1.1 3.3.3-9)
The root file system is mounted via NFS, than it start to call
"run_init_process("/sbin/init")".
After do this, the following error message will dump.
Oops: kernel access of bad area, sig: 11 [#2]
NIP: 00153884 LR: 0003AC7C SP: 00581390 REGS: 005812e0 TRAP: 0300 Not tainted
MSR: 00009032 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11
DAR: 11000F5A, DSISR: 08000000
TASK = 0057f730[1] 'init' THREAD: 00580000
Last syscall: 11
GPR00: 11000F5A 00581390 0057F730 00000003 00586000 00581420 00581460 0000000A
GPR08: 00274000 11000F00 00000000 00290000 0057F900 50482121 10016DB4 10016DB4
GPR16: 00000000 0A3421AD 00000000 00000801 00000074 00000000 0000007C 005D2AA0
GPR24: 00581420 00581420 00000003 00000003 00274060 00000000 00586000 005D2AA0
NIP [00153884] ipg_interrupt_handler+0x1c/0x114
LR [0003ac7c] __do_IRQ+0x164/0x214
Call trace:
[0003ac7c] __do_IRQ+0x164/0x214
[00006280] do_IRQ+0x3c/0x9c
[00005050] ret_from_except+0x0/0x14
[00005328] die+0x94/0x98
[0000e6cc] bad_page_fault+0x48/0x5c
[00004e30] handle_page_fault+0x7c/0x80
[001797e8] __alloc_skb+0x64/0x12c
[0018f9d0] qdisc_restart+0x100/0x1fc
[00180a04] dev_queue_xmit+0x10c/0x258
[0019eda4] ip_output+0x238/0x2a0
[0019e82c] ip_push_pending_frames+0x334/0x438
[001be790] udp_push_pending_frames+0x1dc/0x200
[001bd78c] udp_sendmsg+0x528/0x600
[001c6168] inet_sendmsg+0xb4/0xc8
[00173510] sock_sendmsg+0xac/0xcc
Kernel panic - not syncing: Aiee, killing interrupt handler!
<0>Rebooting in 180 seconds..
>From dump messages I ckeck the source code in function
>"ipg_interrupt_handler+0x1c/0x114", the exception
is cause by access PCI memory space of my NIC device, but this access is fine
before run_init_process("/sbin/init")
is called.
Here is my NIC device logical and physical mappping.
The physical base address of this NIC is assign to 0xbffcff00
The virtual memory is map to 0x11000F00
I also trace call stack for run_init_process("/sbin/init").
run_init_process("/sbin/init")
|
v
...wait until the file got from NFS .....
|
v
load_elf_binary()
|
v
flush_old_exec()
|
v
exec_mmap()
|
v
activate_mm() ---> After this function is called, to access PCI memory space
of my NIC device the excepton will occur.
I have also check "Segment Regiser" of mpc8245.
Before the activate_mm() called the "Segment Regiser" is list as follow:
SR0 : 20000000
SR1 : 20000111
SR2 : 20000222
SR3 : 20000333
SR4 : 20000444
SR5 : 20000555
SR6 : 20000666
SR7 : 20000777
SR8 : 20000888
SR9 : 20000999
SR10 : 20000AAA
SR11 : 20000BBB
SR12 : 20000CCC
SR13 : 20000DDD
SR14 : 20000EEE
SR15 : 20000FFF
After the activate_mm() called the "Segment Regiser" is list as follow:
SR0 : 60003810
SR1 : 60003921
SR2 : 60003A32
SR3 : 60003B43
SR4 : 60003C45
SR5 : 60003D65
SR6 : 60003E76
SR7 : 60003F87
SR8 : 20000888
SR9 : 20000999
SR10 : 20000AAA
SR11 : 20000BBB
SR12 : 20000CCC
SR13 : 20000DDD
SR14 : 20000EEE
SR15 : 20000FFF
I think the memory translate have problem after call "activate_mm()".
Is my MMU setting have problems, or someone would tell me which setting or
configure I need to check?
/Wen
