自己编写根文件系统启动到这里就死了，为什么 跪求答案啊
mmc0: SDHCI controller on samsung-hsmmc [s3c-sdhci.0] using ADMA
s3c-sdhci s3c-sdhci.1: clock source 0: hsmmc (133000000 Hz)
s3c-sdhci s3c-sdhci.1: clock source 1: hsmmc (133000000 Hz)
s3c-sdhci s3c-sdhci.1: clock source 2: mmc_bus (84666666 Hz)
mmc1: SDHCI controller on samsung-hsmmc [s3c-sdhci.1] using ADMA
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
mmc0: new high speed SDHC card at address 1234
mmcblk0: mmc0:1234 SA04G 3.63 GiB
mmcblk0: p1
asoc: wm9713-hifi <-> samsung-ac97 mapping ok
ALSA device list:
#0: MINI6410
TCP cubic registered
NET: Registered protocol family 17
VFP support v0.3: implementor 41 architecture 1 part 20 variant b rev 5
s3c-rtc s3c64xx-rtc: setting system clock to 2000-01-20 03:36:29 UTC (948339389)
Freeing init memory: 1408K
UBIFS: mounted UBI device 0, volume 0, name "FriendlyARM-root"
UBIFS: file system size: 2065416192 bytes (2017008 KiB, 1969 MiB, 2001 LEBs)
UBIFS: journal size: 12517376 bytes (12224 KiB, 11 MiB, 13 LEBs)
UBIFS: media format: w4/r0 (latest is w4/r0)
UBIFS: default compressor: lzo
UBIFS: reserved for root: 0 bytes (0 KiB)
1Wire touchscreen OK
Kernel panic - not syncing: Attempted to kill init!
[<c0177c44>] (unwind_backtrace+0x0/0xe4) from [<c051486c>] (panic+0x58/0x174)
[<c051486c>] (panic+0x58/0x174) from [<c0189e48>] (do_exit+0x68/0x5e4)
[<c0189e48>] (do_exit+0x68/0x5e4) from [<c018a688>] (do_group_exit+0x90/0xc4)
[<c018a688>] (do_group_exit+0x90/0xc4) from [<c01940c0>] (get_signal_to_deliver)
one_wire_status: 2
[<c01940c0>] (get_signal_to_deliver+0x30c/0x344) from [<c0175048>] (do_signal+0)
[<c0175048>] (do_signal+0x50/0x5b4) from [<c0175b70>] (do_notify_resume+0x18/0x)
one_wire_status: 2
[<c0175b70>] (do_notify_resume+0x18/0x48) from [<c0172638>] (work_pending+0x24/)
[解决办法]
找找unwind_backtrace这个函数在哪个位置，是驱动加载出错了，访问了空指针panic了。
