However, once you're in iPXE, that has features for downloading images over HTTPS: http://ipxe.org/crypto http://ipxe.org/crypto (plus it's probably easier to

However, once you're in iPXE, that has features for downloading images over HTTPS: http://ipxe.org/crypto http://ipxe.org/crypto (plus it's probably easier to upgrade than your motherboard's network boot implementation).