imx6q fec 驱动异常导致重启，重启后就正常了，不知什么原因？
kernel BUG at include/linux/netdevice.h:520!
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = d0614000
[00000000] *pgd=00000000
Internal error: Oops: 805 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 Tainted: G B W (3.0.35 #10)
PC is at __bug+0x1c/0x28
LR is at __bug+0x18/0x28
pc : [<c004efec>] lr : [<c004efe8>] psr: 600b0013
sp : d04f1df8 ip : 00000000 fp : 00000001
r10: d04f0000 r9 : d418d380 r8 : 00000000
r7 : d46f4044 r6 : 00000000 r5 : c06a0a8c r4 : d46f4000
r3 : 00000000 r2 : c0909ebc r1 : 600b0093 r0 : 00000033
Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
Control: 10c53c7d Table: 2061404a DAC: 00000015
PC: 0xc004ef6c:
ef6c e1a04000 e24dd010 e590003c eb01ca10 e3500000 0594003c 0a00000d e2841034
ef8c e594002c e891000e e88d000f ea000003 e59d000c eb01ca06 e3500000 0a000006
U-Boot 2009.08-dirty (Oct 10 2015 - 13:55:35)
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