I found a .txt who change the kernel command line and when i open it, it was
-e noinitrd console=ttyAM0,115200 root=/dev/sdb3 rw rootwait ip=none ssp0
but in ltib it was
-e noinitrd console=ttyAM0,115200 root=/dev/mmcblk0p3 rw rootwait ip=none ssp0
So I change the .txt and it works
thanks for help
directory of .txt : /ltib/rpm/BUILD/imb-bootlets-src-10.12.01/linux_prep/cmdlines/IMX28_EVK.tkt