kernel panic

[ 1.946354] mmcblk0: p1 p2
[ 1.952821] mmcblk0boot1: unknown partition table
[ 1.959812] mmcblk0boot0: unknown partition table
[ 2.070829] VFS: Cannot open root device "mmcblk0p2" or unknown-block(179,2)
[ 2.078217] Please append a correct "root=" boot option; here are the available partitions:
[ 2.087003] b300 3866624 mmcblk0 driver: mmcblk
[ 2.092587] b301 72261 mmcblk0p1 00000000-0000-0000-0000-000000000000
[ 2.100432] b302 3783307 mmcblk0p2 00000000-0000-0000-0000-000000000000
[ 2.108269] b310 1024 mmcblk0boot1 (driver?)
[ 2.113846] b308 1024 mmcblk0boot0 (driver?)
[ 2.119408] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2)
[ 2.128243] Backtrace:

用AM335X开发板源码重新编译了一个uImage  其他文件没有变  烧写之后就出现这种情况