问题似乎是在mount文件系统的时候：
Freeing init memory: 1404K
FAT: utf8 is not a recommended IO charset for FAT filesystems, filesystem will b
e case sensitive!
losetup: /dev/loop0: No such file or directory
bio too big device loop0 (2 > 0)
EXT3-fs (loop0): error: unable to read superblock
mount: mounting /dev/loop0 on /r failed: Invalid argument
mount: mounting /sdcard on /r/sdcard failed: No such file or directory
这个/dev/loop0是什么设备？由于设备无法读取到super block信息，后续的无法mount，kernel就直接panic了
我的是4G SD卡，mini6410+1G NAND的板子
