根文件系统制作 -- Kernel panic - not syncing
目标环境： Embedded Linux
系统版本： linux-2.6.35.3
GUI版本： QtEmbedded-4.8.5-arm
问题描述：
UBIFS: mounted UBI device 0, volume 0, name "rootfs0"
UBIFS: file system size: 106786816 bytes (104284 KiB, 101 MiB, 841 LEBs)
UBIFS: journal size: 5332992 bytes (5208 KiB, 5 MiB, 42 LEBs)
UBIFS: media format: w4/r0 (latest is w4/r0)
UBIFS: default compressor: lzo
UBIFS: reserved for root: 4952683 bytes (4836 KiB)
VFS: Mounted root (ubifs filesystem) on device 0:15.
Freeing init memory: 160K
Kernel panic - not syncing: No init found. Try passing init= option to kernel. See Linux Documentation/init.txt for guidance.
Backtrace:
[] (dump_backtrace+0x0/0x114) from [] (dump_stack+0x18/0x1c)
r7:00000013 r6:c0050170 r5:c0028e84 r4:c053f338
[] (dump_stack+0x0/0x1c) from [] (panic+0x78/0xf4)
[] (panic+0x0/0xf4) from [] (init_post+0xb4/0xdc)
r3:00000000 r2:c752c300 r1:c752c400 r0:c0483252
[] (init_post+0x0/0xdc) from [] (kernel_init+0x12c/0x170)
r5:c0028e84 r4:c053e460
[] (kernel_init+0x0/0x170) from [] (do_exit+0x0/0x6dc)
r5:c00083d0 r4:00000000
分析：
对照自带根文件系统， 无 不合理的地方
#sudo tar // 提升权限重新打包 根文件系统
结果：
重新下载固件， 运行正常
UBIFS: mounted UBI device 0, volume 0, name "rootfs0"
UBIFS: file system size: 106786816 bytes (104284 KiB, 101 MiB, 841 LEBs)
UBIFS: journal size: 5332992 bytes (5208 KiB, 5 MiB, 42 LEBs)
UBIFS: media format: w4/r0 (latest is w4/r0)
UBIFS: default compressor: lzo
UBIFS: reserved for root: 4952683 bytes (4836 KiB)
VFS: Mounted root (ubifs filesystem) on device 0:15.
Freeing init memory: 160K
starting pid 1140, tty '': '/etc/rc.d/rcS'
Mounting /proc and /sys
Starting the hotplug events dispatcher udevd
Synthesizing initial hotplug events
Setting the hostname to myzr
Mounting filesystems
Generating keys for the ssh server:
Starting the ssh server:
Setting up networking on loopback device:
Setuping the eth0: 192.168.3.104
eth0: Freescale FEC PHY driver [Gen原因：
部分文件访问需要 root 权限， 普通用户身份打包会遗漏部分文件， 关键文件的缺少导致系统起不来。