although i didn't tested it, I'm pretty sure on the official rom i had nfc enabled but I can't turn it on anymore.
tried on a bunch of roms, stock an vikinger kernel but no luck. nfc is always disabled and when i try to enable it the button moves to "I" for a couple of seconds but it goes back to "O", doesn't turn green.
the only rom i could enable nfc is cm11, so no hw problem..
knox is 0x1 but i don't think this has to do anything with it..
can you please confirm nfc is working on specific roms? (jm7, knox 0x1)