TODO.efiboot revision 1.3 
1- efiboot
2 * handle UEFI variables
3 * boot from CD/DVD (bootable from CD/DVD, but root fs not found.)
4 * load boot.cfg from EFI system partition (FAT32)
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6- kernel
7 * handle UEFI variables (/dev/efivar)
8 * accelerated console
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10- userland
11 * efibootmgr like utility
12 * merge distrib/amd64/uefi-installimage to distrib/amd64/install-image
13 * merge distrib/amd64/uefi-installimage/Makefile.* to distrib/common/Makefile.*
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15- installer
16 * sysinst(8): handle dk(4) for install disk
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