Thanks Robert for the quickly reply.
However I should have mentioned that the real issue I got was I could find
partition /dev/mmcblk0p1 once boot via NFS or uSD.
root@beaglebone:~# ls /dev/m* -la
crw-r----T 1 root kmem 1, 1 Jan 1 2000 /dev/mem
Not sure it is peculiar to my board (NFS boot into ubuntu 14.04.1).
But anyway I sorted it out by getting into uboot. In case any one else gets
into the same trouble, I post back the steps I used to switch NFS boot back
to eMMC boot:
1. Hook serial console and space bar into uboot
2. type "boot" and ctrl-C while it is NFS booting is loading files (still
loads the modified uEnv.txt)
3. recover the original uenvcmd by
set uenvcmd 'run loadfiles; run mmcargs; bootz ${loadaddr}
${initrd_addr}:${initrd_size} ${fdtaddr}'
4. run uenvcmd to boot via eMMC
Once booted, /boot/uboot/uEnv.txt can be edited from there.
Note: my uEnv.txt used for NFS booting only got extra defs on top of
original uEnv.txt), hence step 2 can set up all the variables.
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