CTF: UEFI HTTP boot support

[Jan Beich]

Rebecca Cran <bcran at freebsd.org> writes:

> I've been working with D Scott Phillips to test the UEFI HTTP loader
> code he's written, and we're now ready for wider testing.
[...]

I can't boot after r349349. loader.efi appears to fail to load. As my
boot pool is striped maybe HTTP code interferes with ZFS code assembling
bits from multiple disks. Any ideas how to debug?

Note, UEFI Network Stack is disabled and UEFI Hard Disk is #1 boot option.

  >> FreeBSD EFI boot block
     Loader path: /boot/loader.efi

     Initializing modules: ZFS UFS
     Load Path: \EFI\BOOT\BOOTX64.EFI
     LoadDevice: PciRoot(0x0)/Pci(0x1B,0x0)/Pci(0x0,0x0)/Unit(0x1)/HD(2,GPT,...)
     BootCurrent: 0004
     BootOrder: 0004 0005 0006 0007
     Probing 20 block devices......+.....*....+..... done
      ZFS found the following pools: foo bar
      UFS found no partitions
      command args: -DS115200

  Consoles: EFI console
      Reading loader env vars from /efi/freebsd/loader.env
  Setting currdev to disk1p3:
  \