Since the EDK2 GenerateCapsule script is out of date and it
doesn't generate the supported version capsule file, the document
should refer the mkeficapsule in tools.
Signed-off-by: NMasami Hiramatsu <masami.hiramatsu@linaro.org>

The UEFI spec allows a packed array of UEFI device paths in the
FilePathList[] of an EFI_LOAD_OPTION. The first file path must
describe the loaded image but the rest are OS specific.

Previous patches parse the device path and try to use the second
member of the array as an initrd. So let's modify efidebug slightly
and install the second file described in the command line as the
initrd device path.
Signed-off-by: NIlias Apalodimas <ilias.apalodimas@linaro.org>

Add documentation highlighting the steps for using the uefi capsule
update feature for updating the u-boot firmware image.
Signed-off-by: NSughosh Ganu <sughosh.ganu@linaro.org>