Boot Error

anybody know what´s happen when this message is show in boot sequence:

RAMDISK: Couldn't find valid RAM disk image starting at 0.
List of all partitions:
1f00 512 mtdblock0 (driver?)
1f01 1920 mtdblock1 (driver?)
1f02 128 mtdblock2 (driver?)
1f03 4096 mtdblock3 (driver?)
1f04 255488 mtdblock4 (driver?)
No filesystem could mount root, tried: ext3
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0)


maybe the bootargs aren’t properly set, this are the ones I use:

Regular(just kernel):
bootcmd=mmcinit;fatload mmc 0 0x80300000 uImage;fatload mmc 0 0x81600000 rd-ext2.bin;bootm 0x80300000
bootargs=console=ttyS2,115200n8 ramdisk_size=8192 root=/dev/ram0 rw rootfstype=ext2 initrd=0x81600000,8M nohz=Off


setenv bootargs ‘console=ttyS2,115200n8 root=/dev/mmcblk0p2 rw rootwait’

setenv bootcmd ‘mmcinit;fatload mmc 0 80300000 uImage;bootm 80300000’

Or maybe your SD is missing a file, my configuration requires:

Hope this helps,