can I make a usb key , support efi boot & pcbios

[NiKiZe]

There is no need for a GPT partitiontable to have a usb drive being efi bootable.

Some steps

1. make bin/ipxe.usb
2. cat bin/ipxe.usb > /dev/sdx (the usb device)
3. fdisk /dev/sdX
4. create a new partition, change to partition type 0x0c
5. mkfs.vfat the new partition (partitionnumber should be 1)
6. mount and create EFI/boot directory
7. make bin-x86_64-efi/ipxe.efi
8. copy bin-x86_64-efi/ipxe.efi to EFI/boot/bootx64.efi
9. unmount and sync

And you are ready to go