关闭uboot的MMU 会导致S5pv210 android 不稳定？！

在uboot里面屏蔽了MMU 使能

//#define CONFIG_ENABLE_MMU

就导致android 2.3 在S5pv210 上不稳定了，如果没屏蔽就稳定很多，why？！

坑爹的人啊，问了一些做了几年linux和android的人说没影响的，啥玩意啊，怎么会这么挫呢！

尤其是S5pv210 的GPU 驱动，出问题最频繁，如果是我内存参数传递有误，系统是不会启动的，怎么搞成这样呢？

有经验的过来说说吧。

下面是这几天的实验现象

重复启动会遇到这种问题,系统死机了：
[    2.896160] android_usb gadget: high speed config #1: Android Composite
[    4.510793] request_suspend_state: wakeup (3->0) at 3981410419 (2010-01-01 12:00:04.019802543 UTC)
[    4.521102] init: untracked pid 51 exited
[    4.523756] init: untracked pid 55 exited
[   13.611361] Internal error: Oops - undefined instruction: 0 [#1] PREEMPT
[   13.616584] last sysfs file: /sys/power/state
[   13.620944] Unable to handle kernel paging request at virtual address 0a0000de
[   13.628110] pgd = c0004000
[   13.630795] [0a0000de] *pgd=00000000
[   21.121137] BUG: spinlock lockup on CPU#0, /0, c0510374
[   21.124869] Backtrace: 
[   21.127324] [<c0031fb8>] (dump_backtrace+0x0/0x110) from [<c0392880>] (dump_stack+0x18/0x1c)
[   21.135703]  r6:00000000 r5:c0088000 r4:c0510374 r3:e1a00005
[   21.141343] [<c0392868>] (dump_stack+0x0/0x1c) from [<c01976c4>] (do_raw_spin_lock+0x128/0x168)
[   21.150008] [<c019759c>] (do_raw_spin_lock+0x0/0x168) from [<c0395804>] (_raw_spin_lock_irq+0x2c/0x30)
[   21.159272]  r8:00000005 r7:c049cd52 r6:c0088038 r5:c008a0d0 r4:c008a0d0
[   21.165951] [<c03957d8>] (_raw_spin_lock_irq+0x0/0x30) from [<c0032330>] (die+0x30/0x1cc)
[   21.174098] [<c0032300>] (die+0x0/0x1cc) from [<c00348cc>] (__do_kernel_fault+0x6c/0x8c)
[   21.182149]  r8:00000000 r7:00000005 r6:00000000 r5:c008a0d0 r4:0a0000de
[   21.188827] [<c0034860>] (__do_kernel_fault+0x0/0x8c) from [<c0034acc>] (do_page_fault+0x1e0/0x1fc)
[   21.197834]  r8:00000000 r7:0a0000de r6:00000001 r5:c008a0d0 r4:c0571fd0
[   21.204333] r3:c008a0d0
[   21.206939] [<c00348ec>] (do_page_fault+0x0/0x1fc) from [<c0034b98>] (do_translation_fault+0x24/0xa0)
[   21.216125] [<c0034b74>] (do_translation_fault+0x0/0xa0) from [<c002d2f4>] (do_DataAbort+0x3c/0xa0)
[   21.225131]  r6:0a0000de r5:c051044c r4:00000005 r3:c05103fc
[   21.230769] [<c002d2b8>] (do_DataAbort+0x0/0xa0) from [<c002da6c>] (__dabt_svc+0x4c/0x60)




又遇到这种问题了
ext4format 按复位10次不到又死机了。
[   11.329304] Modules linked in:
[   11.332340] CPU: 0    Not tainted  (2.6.35.7 #1)
[   11.336932] PC is at 0xe41ab000
[   11.340059] LR is at do_PrefetchAbort+0x3c/0xa0
[   11.344558] pc : [<e41ab000>]    lr : [<c002d254>]    psr: 60000193
[   11.344564] sp : ee9d3c28  ip : 00000004  fp : 3162c3ef
[   11.355994] r10: c051e8d8  r9 : 20000193  r8 : 3b1235a2
[   11.361194] r7 : ee9d3cb0  r6 : e52d1004  r5 : c051063c  r4 : c002d2f4
[   11.367693] r3 : c05105fc  r2 : ee9d3cb0  r1 : c002d2f4  r0 : e52d1004
[   11.374194] Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment user
[   11.381385] Control: 10c5387d  Table: 4e9d4019  DAC: 00000015
[   11.387103] 
[   11.387106] PC: 0xe41aaf80:
[   11.391348] af80  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   11.399494] afa0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   11.407639] afc0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   11.415785] afe0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   11.423931] b000  ff000000 ff000000 ff000000 ff000000 ff000000 ff000000 ff000000 ff000000
[   11.432076] b020  ff000000 ff000000 ff000000 ff000000 ff000000 ff000000 ff000000 ff000000
[   11.440222] b040  ff000000 ff000000 ff000000 ff000000 ff000000 ff000000 ff000000 ff000000
[   11.448368] b060  ff000000 ff000000 ff000000 ff000000 ff000000 ff000000 ff000000 ff000000
[   11.456514] 
[   11.456516] LR: 0xc002d1d4:
[   11.460760] d1d4  e50be09c e3a0e004 e50b5098 e50be0a4 e28ee002 e50bc0a0 e58de000 eb0014ce
[   11.468905] d1f4  e24bd020 e89da9f0 c051035c c051036c c054b344 c049c790 c049c7ba 00030001
[   11.477051] d214  c049c7be e1a0c00d e92dd8f0 e24cb004 e24dd088 e201cb01 e1a04001 e201100f
[   11.485196] d234  e59f3070 e181c32c e3841102 e1a06000 e1a07002 e083520c e1a0e00f e793f20c
[   11.493342] d254  e3500000 0a000011 e595100c e1a02004 e1a03006 e59f0040 eb0d95c2 e595c008
[   11.501488] d274  e595e004 e1a01007 e1a03004 e59f002c e24b209c e50bc094 e50be09c e3a0c000
[   11.509633] d294  e50b6090 e58dc000 e50bc098 eb0014a2 e24bd01c e89da8f0 c05105fc c049cc57
[   11.517779] d2b4  c04b5b5c e1a0c00d e92dd8f0 e24cb004 e24dd088 e201cb01 e1a04001 e201100f
[   11.525925] 
[   11.525928] SP: 0xee9d3ba8:


还是wince稳定啊。
晕ext3format 之后又来了一次不启动
[    2.712437] warning: `rild' uses 32-bit capabilities (legacy support in use)
[    3.021029] android_usb gadget: high speed config #1: Android Composite
[   10.009783] request_suspend_state: wakeup (3->0) at 9480398418 (2010-01-01 12:00:09.518617168 UTC)
[   12.192678] Unable to handle kernel paging request at virtual address 76453320
[   12.198419] Unable to handle kernel paging request at virtual address 300af87d
[   12.205610] Unable to handle kernel paging request at virtual address 300af87d
[   12.212802] Unable to handle kernel paging request at virtual address 300af87d
[   12.219995] Unable to handle kernel paging request at virtual address 300af87d
[   12.227187] Unable to handle kernel paging request at virtual address 300af87d
[   12.234380] Unable to handle kernel paging request at virtual address 300af87d
[   12.241572] Unable to handle kernel paging request at virtual address 300af87d
[   12.248765] Unable to handle kernel paging request at virtual address 300af87d
[   12.255957] Unable to handle kernel paging request at virtual address 300af87d
[   12.263149] Unable to handle kernel paging request at virtual address 300af87d
[   12.270342] Unable to handle kernel paging request at virtual address 300af87d

换一个内核也这样

[  122.100605] PVR_K:   (MKT-1F1) 005AC61F 00000808 0103091E AD000281
[  122.106655] PVR_K:   (MKT-1F2) 005AC753 00000808 0103091E AD001302
[  122.119954] PVR_K:   (MKT-1F3) 005AC785 00000808 0103091E AD001303
[  122.124595] PVR_K:   (MKT-1F4) 005AC7FD 00000808 0103091E AD001300
[  122.130650] PVR_K:   (MKT-1F5) 005AC8BE 00000808 0103091E AD001301
[  122.136716] PVR_K:   (MKT-1F6) 005AC97C 00000808 0103091E AD000802
[  122.142781] PVR_K:   (MKT-1F7) 005ACA75 00000808 0103091E AD000803
[  122.148858] PVR_K:   (MKT-1F8) 005ACAAC 00184AD8 0103091E AD000282
[  122.154914] PVR_K:   (MKT-1F9) 005AF403 00000808 01030B1F AD000200
[  122.160978] PVR_K:   (MKT-1FA) 005AF518 00000808 01030B1F AD001703
[  122.167073] PVR_K:   (MKT-1FB) 005AF628 00000808 00030B1F AD000202
[  122.173114] PVR_K:   (MKT-1FC) 005AF681 00000808 01030C1E AD000183
[  122.179178] PVR_K:   (MKT-1FD) 005AF775 00000808 01030C1E AD000302
[  122.185242] PVR_K:   (MKT-1FE) 005AF92B 00000808 01030C1E AD000402
[  122.191322] PVR_K:   (MKT-1FF) 005AF95E 001008AF 01030C1E AD000184
[  122.197374] PVR_K: SGX Kernel CCB WO:0x8E RO:0x8B
[  122.799576] request_suspend_state: sleep (0->3) at 122254653481 (1970-01-02 00:01:57.976566041 UTC)
[  122.807888] ==ft5x0x_ts_suspend=
[  122.815866] request_suspend_state: wakeup (3->0) at 122270939149 (1970-01-02 00:01:57.992852334 UTC)
[  122.823593] s3cfb_late_resume is called
[  122.841446] FIMD src sclk = 166750000
[  122.853288] request_suspend_state: sleep (0->3) at 122308366690 (1970-01-02 00:01:58.030279042 UTC)
[  122.867604] request_suspend_state: wakeup (3->0) at 122322673982 (1970-01-02 00:01:58.044586666 UTC)
[  123.060861] s3cfb_late_resume is complete
[  123.063531] ==ft5x0x_ts_resume=
[  124.549989] request_suspend_state: sleep (0->3) at 124005067392 (1970-01-02 00:01:59.726979618 UTC)
[  124.565399] ==ft5x0x_ts_suspend=
[  124.874518] request_suspend_state: wakeup (3->0) at 124329589056 (1970-01-02 00:02:00.051502116 UTC)
[  124.882209] s3cfb_late_resume is called
[  124.886235] FIMD src sclk = 166750000
[  125.061828] s3cfb_late_resume is complete
[  125.064630] ==ft5x0x_ts_resume=
[  128.972794] usb 2-1: USB disconnect, address 3
[  130.584162] Unhandled fault: external abort on non-linefetch (0x008) at 0xf4a00134
[  130.590250] Internal error: : 8 [#1] PREEMPT
[  130.594492] last sysfs file: /sys/power/wait_for_fb_sleep
[  130.599865] Modules linked in:
[  130.602900] CPU: 0    Not tainted  (2.6.35.7 #20)
[  130.607589] PC is at s3cfb_clear_interrupt+0x14/0x64
[  130.612518] LR is at s3cfb_irq_frame+0x18/0x28
[  130.616939] pc : [<c01ac7d8>]    lr : [<c01ab944>]    psr: 60000193
[  130.616945] sp : c05c5e60  ip : c05c5e78  fp : c05c5e74
[  130.628375] r10: c06422bc  r9 : c05c4000  r8 : 00000001
[  130.633575] r7 : 00000061  r6 : 00000000  r5 : 00000000  r4 : f3ca6b00
[  130.640074] r3 : f4a00000  r2 : 00010002  r1 : f3ca6b00  r0 : f3ca6b00
[  130.646575] Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
[  130.653940] Control: 10c5387d  Table: 536d4019  DAC: 00000017
[  130.659657] 
[  130.659660] PC: 0xc01ac758:
[  130.663902] c758  e89da818 e5903000 e2810008 e7933100 f57ff05f e592c06c e3c33042 e35c0001
[  130.672048] c778  03833042 03a02000 0a000004 e592c070 e5922074 e35c0000 13833002 01a02602
[  130.680193] c798  f57ff04f e594c000 e78c3100 f57ff04f e5943000 e1a01201 e2811048 e3a00000
[  130.688339] c7b8  e7812003 e89da818 c0565321 e1a0c00d e92dd830 e24cb004 e5903000 e1a04000
[  130.696485] c7d8  e5935134 f57ff05f e3150001 0a000008 e590002c eb00e44c e594302c e593202c
[  130.704630] c7f8  e3520000 05932008 e1a01000 e59f0018 eb097fff e3855027 f57ff04f e5943000
[  130.712776] c818  e3a00000 e5835134 e89da830 c0565353 e1a0c00d e92dd818 e24cb004 e5903000
[  130.720922] c838  e1a04000 e5933000 f57ff05f e5902068 e3c33307 e3520000 0a000011 e3520001
[  130.729068] 
[  130.729071] LR: 0xc01ab8c4:
[  130.733314] b8c4  3a000002 e5940264 ebfa2f90 ea000003 e1a00007 e594110c e5942264 ebfa29db
[  130.741459] b8e4  e3a03000 e5843264 e3a03000 e584310c e5843108 e595002c eb00e808 e595302c
[  130.749605] b904  e593202c e3520000 05932008 e5963000 e1a01000 e59f0008 eb0983ba e3a00000
[  130.757751] b924  e89da8f0 c0564fda e1a0c00d e92dd818 e24cb004 e1a00001 e1a04001 eb00039f
[  130.765896] b944  e2840040 ebfa7d13 e3a00001 e89da818 e1a0c00d e92ddff0 e24cb004 e24dd034
[  130.774042] b964  e1a06000 e5900258 e1a0a001 e1a04002 eb00f540 e59f334c e3a09000 e15a0003
[  130.782188] b984  e5908070 e1a07000 e50b9030 e5965278 0a000044 8a000009 e59f332c e15a0003
[  130.790333] b9a4  0a000080 e59f3324 e15a0003 0a000013 e59f331c e15a0003 1a0000be ea000009
[  130.798480] 
[  130.798482] SP: 0xc05c5de0:
[  130.802725] 5de0  c05d6f20 00000081 c05c5e3c c05c5df8 c0072030 c00403d8 ffffffff c05c5e4c
[  130.810871] 5e00  00000000 00000061 c05c5e74 c05c5e18 c002fa6c c002f2c4 f3ca6b00 f3ca6b00
[  130.819016] 5e20  00010002 f4a00000 f3ca6b00 00000000 00000000 00000061 00000001 c05c4000
[  130.827162] 5e40  c06422bc c05c5e74 c05c5e78 c05c5e60 c01ab944 c01ac7d8 60000193 ffffffff
[  130.835308] 5e60  f3ca6b00 00000000 c05c5e8c c05c5e78 c01ab944 c01ac7d0 00000000 f3f71ac0
[  130.843454] 5e80  c05c5eac c05c5e90 c008a438 c01ab938 c05daf40 00000061 c05daf7c f3f71ac0
[  130.851599] 5ea0  c05c5ecc c05c5eb0 c008c220 c008a418 00000061 00000000 0000001e 00000002
[  130.859745] 5ec0  c05c5ee4 c05c5ed0 c002f074 c008c16c ffffffff fd000000 c05c5f6c c05c5ee8
[  130.867891] 
[  130.867894] IP: 0xc05c5df8:
[  130.872137] 5df8  ffffffff c05c5e4c 00000000 00000061 c05c5e74 c05c5e18 c002fa6c c002f2c4
[  130.880282] 5e18  f3ca6b00 f3ca6b00 00010002 f4a00000 f3ca6b00 00000000 00000000 00000061
[  130.888428] 5e38  00000001 c05c4000 c06422bc c05c5e74 c05c5e78 c05c5e60 c01ab944 c01ac7d8
[  130.896574] 5e58  60000193 ffffffff f3ca6b00 00000000 c05c5e8c c05c5e78 c01ab944 c01ac7d0
[  130.904719] 5e78  00000000 f3f71ac0 c05c5eac c05c5e90 c008a438 c01ab938 c05daf40 00000061
[  130.912865] 5e98  c05daf7c f3f71ac0 c05c5ecc c05c5eb0 c008c220 c008a418 00000061 00000000
[  130.921011] 5eb8  0000001e 00000002 c05c5ee4 c05c5ed0 c002f074 c008c16c ffffffff fd000000
[  130.929156] 5ed8  c05c5f6c c05c5ee8 c002fac8 c002f00c 000b9d40 000003e8 00000000 00000052
[  130.937303] 
[  130.937305] FP: 0xc05c5df4:
[  130.941548] 5df4  c00403d8 ffffffff c05c5e4c 00000000 00000061 c05c5e74 c05c5e18 c002fa6c
[  130.949694] 5e14  c002f2c4 f3ca6b00 f3ca6b00 00010002 f4a00000 f3ca6b00 00000000 00000000
[  130.957840] 5e34  00000061 00000001 c05c4000 c06422bc c05c5e74 c05c5e78 c05c5e60 c01ab944
[  130.965985] 5e54  c01ac7d8 60000193 ffffffff f3ca6b00 00000000 c05c5e8c c05c5e78 c01ab944
[  130.974131] 5e74  c01ac7d0 00000000 f3f71ac0 c05c5eac c05c5e90 c008a438 c01ab938 c05daf40
[  130.982277] 5e94  00000061 c05daf7c f3f71ac0 c05c5ecc c05c5eb0 c008c220 c008a418 00000061
[  130.990422] 5eb4  00000000 0000001e 00000002 c05c5ee4 c05c5ed0 c002f074 c008c16c ffffffff
[  130.998568] 5ed4  fd000000 c05c5f6c c05c5ee8 c002fac8 c002f00c 000b9d40 000003e8 00000000
[  131.006714] 
[  131.006717] R0: 0xf3ca6a80:
[  131.010960] 6a80  00000001 dead4ead ffffffff ffffffff f3ca6a90 f3ca6a90 00000000 00000000
[  131.019106] 6aa0  00000000 00000000 00000000 f3ca6aac f3ca6aac 00000000 0fd00000 00000001
[  131.027251] 6ac0  dead4ead ffffffff ffffffff f3ca6acc f3ca6acc f3ca6940 f3ca6950 f3ca6950
[  131.035397] 6ae0  00000001 f3fbc5c0 00000000 c01e5c48 00000000 00000000 00000000 00000000
[  131.043543] 6b00  f4a00000 00000001 00000001 dead4ead ffffffff ffffffff f3ca6b18 f3ca6b18
[  131.051688] 6b20  00000000 00000000 f3ca6b04 c05d07a8 c05c8df8 f3fbcd80 00000061 f3fbcf40
[  131.059834] 6b40  ffffff0e 00000001 dead4ead ffffffff ffffffff f3ca6b54 f3ca6b54 00000000
[  131.067980] 6b60  00000000 00000000 00000000 00000000 c05cdda4 c05d797c c05fb170 00000096
[  131.076126] 
[  131.076129] R1: 0xf3ca6a80:
[  131.080371] 6a80  00000001 dead4ead ffffffff ffffffff f3ca6a90 f3ca6a90 00000000 00000000
[  131.088517] 6aa0  00000000 00000000 00000000 f3ca6aac f3ca6aac 00000000 0fd00000 00000001
[  131.096663] 6ac0  dead4ead ffffffff ffffffff f3ca6acc f3ca6acc f3ca6940 f3ca6950 f3ca6950
[  131.104809] 6ae0  00000001 f3fbc5c0 00000000 c01e5c48 00000000 00000000 00000000 00000000
[  131.112954] 6b00  f4a00000 00000001 00000001 dead4ead ffffffff ffffffff f3ca6b18 f3ca6b18
[  131.121100] 6b20  00000000 00000000 f3ca6b04 c05d07a8 c05c8df8 f3fbcd80 00000061 f3fbcf40
[  131.129246] 6b40  ffffff0e 00000001 dead4ead ffffffff ffffffff f3ca6b54 f3ca6b54 00000000
[  131.137391] 6b60  00000000 00000000 00000000 00000000 c05cdda4 c05d797c c05fb170 00000096
[  131.145538] 
[  131.145540] R3: 0xf49fff80:
[  131.149783] ff80  ******** ******** ******** ******** ******** ******** ******** ********
[  131.157929] ffa0  ******** ******** ******** ******** ******** ******** ******** ********
[  131.166075] ffc0  ******** ******** ******** ******** ******** ******** ******** ********
[  131.174220] ffe0  ******** ******** ******** ******** ******** ******** ******** ********
[  131.182366] 0000 
[  131.184102] Unhandled fault: external abort on non-linefetch (0x008) at 0xf4a00000
[  138.678605] BUG: spinlock lockup on CPU#0, swapper/0, c05c8374
[  138.682951] Backtrace: 
[  138.685392] [<c0033fb8>] (dump_backtrace+0x0/0x110) from [<c040c710>] (dump_stack+0x18/0x1c)
[  138.693784]  r6:00000000 r5:c05c4000 r4:c05c8374 r3:00000000
[  138.699425] [<c040c6f8>] (dump_stack+0x0/0x1c) from [<c0199624>] (do_raw_spin_lock+0x128/0x168)
[  138.708091] [<c01994fc>] (do_raw_spin_lock+0x0/0x168) from [<c040f694>] (_raw_spin_lock_irq+0x2c/0x30)
[  138.717354]  r8:00000008 r7:c0560691 r6:c05c4008 r5:c05c847c r4:c05c5bf0
[  138.724033] [<c040f668>] (_raw_spin_lock_irq+0x0/0x30) from [<c0034330>] (die+0x30/0x1cc)
[  138.732178] [<c0034300>] (die+0x0/0x1cc) from [<c0034588>] (arm_notify_die+0x58/0x5c)
[  138.739971]  r8:00000000 r7:c05c5bf0 r6:f4a00000 r5:c05c847c r4:00000008
[  138.746655] [<c0034530>] (arm_notify_die+0x0/0x5c) from [<c002f344>] (do_DataAbort+0x8c/0xa0)
[  138.755143] [<c002f2b8>] (do_DataAbort+0x0/0xa0) from [<c002fa6c>] (__dabt_svc+0x4c/0x60)
[  138.763284] Exception stack(0xc05c5bf0 to 0xc05c5c38)
[  138.768312] 5be0:                                     c05c5c64 f4a00000 ffffffe4 00000000
[  138.776458] 5c00: c05c4000 f4a00000 00000000 00000004 00000000 00000004 00000008 c05c5c94
[  138.784603] 5c20: 0000001c c05c5c3c c003140c c018af3c 00000193 ffffffff
[  138.791185]  r7:00000004 r6:00000000 r5:c05c5c24 r4:ffffffff
[  138.796827] [<c0031358>] (show_data+0x0/0x160) from [<c00318b4>] (__show_regs+0x2b8/0x408)
[  138.805056] [<c00315fc>] (__show_regs+0x0/0x408) from [<c00343b8>] (die+0xb8/0x1cc)
[  138.812681] [<c0034300>] (die+0x0/0x1cc) from [<c0034588>] (arm_notify_die+0x58/0x5c)
[  138.820475]  r8:00000001 r7:c05c5e18 r6:f4a00134 r5:c05c847c r4:00000008
[  138.827154] [<c0034530>] (arm_notify_die+0x0/0x5c) from [<c002f344>] (do_DataAbort+0x8c/0xa0)
[  138.835647] [<c002f2b8>] (do_DataAbort+0x0/0xa0) from [<c002fa6c>] (__dabt_svc+0x4c/0x60)
[  138.843786] Exception stack(0xc05c5e18 to 0xc05c5e60)
[  138.848814] 5e00:                                                       f3ca6b00 f3ca6b00
[  138.856962] 5e20: 00010002 f4a00000 f3ca6b00 00000000 00000000 00000061 00000001 c05c4000
[  138.865109] 5e40: c06422bc c05c5e74 c05c5e78 c05c5e60 c01ab944 c01ac7d8 60000193 ffffffff
[  138.873249]  r7:00000061 r6:00000000 r5:c05c5e4c r4:ffffffff
[  138.878889] [<c01ac7c4>] (s3cfb_clear_interrupt+0x0/0x64) from [<c01ab944>] (s3cfb_irq_frame+0x18/0x28)
[  138.888240]  r5:00000000 r4:f3ca6b00
[  138.891803] [<c01ab92c>] (s3cfb_irq_frame+0x0/0x28) from [<c008a438>] (handle_IRQ_event+0x2c/0xec)
[  138.900719]  r4:f3f71ac0 r3:00000000
[  138.904280] [<c008a40c>] (handle_IRQ_event+0x0/0xec) from [<c008c220>] (handle_level_irq+0xc0/0x13c)
[  138.913370]  r7:f3f71ac0 r6:c05daf7c r5:00000061 r4:c05daf40
[  138.919010] [<c008c160>] (handle_level_irq+0x0/0x13c) from [<c002f074>] (asm_do_IRQ+0x74/0x94)
[  138.927582]  r7:00000002 r6:0000001e r5:00000000 r4:00000061
[  138.933221] [<c002f000>] (asm_do_IRQ+0x0/0x94) from [<c002fac8>] (__irq_svc+0x48/0xc0)
[  138.941101] Exception stack(0xc05c5ee8 to 0xc05c5f30)
[  138.946131] 5ee0:                   000b9d40 000003e8 00000000 00000052 c05cfac0 c05cfad0
[  138.954278] 5f00: c002a02c c05c81a8 20027f64 412fc082 c06422bc c05c5f6c 2d5e41ba c05c5f30
[  138.962421] 5f20: c0072ab8 c003ef98 20000013 ffffffff
[  138.967444]  r5:fd000000 r4:ffffffff
[  138.971008] [<c003ee80>] (s5p_enter_idle_bm+0x0/0x350) from [<c02b50e4>] (cpuidle_idle_call+0xac/0x110)
[  138.980356]  r8:20027f64 r7:c05c81a8 r6:c002a02c r5:c05cfad0 r4:c05cfac0
[  138.987035] [<c02b5038>] (cpuidle_idle_call+0x0/0x110) from [<c0031508>] (cpu_idle+0x50/0xa8)
[  138.995534] [<c00314b8>] (cpu_idle+0x0/0xa8) from [<c04073f4>] (rest_init+0xc0/0xe0)
[  139.003233]  r4:c05c4000 r3:00000001
[  139.006793] [<c0407334>] (rest_init+0x0/0xe0) from [<c0008a94>] (start_kernel+0x308/0x36c)
[  139.015018]  r4:c06312d8 r3:00000000
[  139.018576] [<c000878c>] (start_kernel+0x0/0x36c) from [<20008034>] (0x20008034)

看来只能不关闭MMU先了。