Alexander Graf of SuSE has updated his EFI patch for U-Boot, adding the ability to boot from El Torito-style ISOs:
efi_loader: Support loading from El Torito isos
Some distributions still provide .iso files for installation media. To give us greatest flexibility, this patch set adds support for El Torito booting with EFI payloads.
iso: Make little endian and 64bit safe
iso: Start with partition 1
iso: Allow 512 byte sector size
efi_loader: Split drive add into function
efi_loader: Add el torito support
efi_loader: Pass file path to payload
efi_loader: Increase path string to 32 characters
distro: Enable iso partition code
For more information, see the full patch:
http://lists.denx.de/mailman/listinfo/u-boot
Firmware Security 