putting vsa in v3 is very simple.
lar -a build/bios.bin your-vsa-file:blob/vsa
That last is a tad confusing, maybe. The part before the : is the unix pathname. The part after the : is the lar pathname.
Make sure it is blob/vsa, NOT /blob/vsa
To see if it is there, lar -l build/bios.bin
thanks
ron