[uClinux-dev] Segmentation fault while running some applications!

[Zhenxing Luo]

As I know, uclinux is designed for noMMU device, isn't it?

Sent from my MIPHONE

I have tried to compile the kernel by disabling the MMU, but it gives
arch/arm/mm/proc-macros.S:81:2: error: #error PTE shared bit mismatch
arch/arm/mm/proc-macros.S:84:2: error: #error PTE bufferable bit mismatch
arch/arm/mm/proc-macros.S:87:2: error: #error PTE cacheable bit mismatch
I am a bit confused about disabling the MMU because AT91SAM9X has MMU
support...can u make me clear about that?

Thanks for reply Greg!
No, the MMU is enabled in the kernel configuration.
On Tue, Dec 11, 2012 at 6:51 AM, Greg Ungerer

Hi Arshan,

hi,
i m having an issue when i run iptables on AT91SAM9X in uClinux. I get
# iptables -v
pgd = c0474000
[ffff198c] *pgd=203f0031, *pte=00000000, *ppte=00000000
Pid: 372, comm: iptables
CPU: 0 Not tainted (2.6.30.4-uc0 #195)
PC is at 0x401446c4

You need to figure out where this address is.
Are you truly running with MMU disabled?
You will pretty easily be able to tell from your kernel .config.
Regards
Greg

LR is at 0x9ad0
pc : [<401446c4>] lr : [<00009ad0>] psr: 60000010
sp : bef16d50 ip : 401446c0 fp : 00000000
r10: 40025000 r9 : 00000000 r8 : 00000000
r7 : 00000002 r6 : bef16eb4 r5 : bef16f8f r4 : ffff198c
r3 : ffff198c r2 : 00000000 r1 : ffff198c r0 : ffff198c
Flags: nZCv IRQs on FIQs on Mode USER_32 ISA ARM Segment user
Control: 0005317f Table: 20474000 DAC: 00000015
[<c00282c4>] (show_regs+0x0/0x50) from [<c002cd64>]
(__do_user_fault+0x5c/0xa4)
r5:ffff198c r4:c1c5b9c0
[<c002cd08>] (__do_user_fault+0x0/0xa4) from [<c002d020>]
(do_page_fault+0x1f8/0x230)
r7:c182a214 r6:c1c5b9c0 r5:000000o_Dat0026d40>]
(ret_from_exception+0x0/0x10)
Exception sto 0xc12f5ff8)
5fa0: ffff198c ffff198c 00000000 ffff198c
5fc0: ffff198c bef16f8f bef16eb4 00000002 00000000 00000000 40025000
00000000
5fe0: 401446c0 bef16d50 00009ad0 401446c4 60000010 ffffffff
Segmentation fault
Kindly help me solving the issue...
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