Your board fails to mount root filesystem because the size of the
root filesystem image generated by fsl-image-full Yocto target is
larger than the default ramdisk size. Use ramdisk_size kernel parameter
to specify the size of the ramdisk. See Documentation/kernel-parameters.txt
and Documentation/blockdev/ramdisk.txt for more information. Keep in
mind that the size of the ramdisk must exceed the _uncompressed_ size
of the root filesystem image.
Note. fsl-image-full target generates a relatively large root filesystem
image. It is not checked against available memory limit and may not
be suitable for ramdisk deployment. If you wish to stay with ramdisk
root, consider using fsl-image-core or fsl-image-minimal. Otherwise,
use NFS root.
Have a great day,
Platon
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