04-23-2016, 08:17 PM
I have no experience with UEFI or NVRAM but after a little searching it appears that "efibootmgr" is capable of changing boot options. See the following.
http://linux.die.net/man/8/efibootmgr
http://linux.die.net/man/8/efibootmgr
“I have not failed. I’ve just found 10,000 ways that won’t work.” - Thomas Edison