efi: Add support for loading U-Boot through an EFI stub
authorSimon Glass <sjg@chromium.org>
Tue, 4 Aug 2015 18:33:52 +0000 (12:33 -0600)
committerSimon Glass <sjg@chromium.org>
Wed, 5 Aug 2015 14:44:06 +0000 (08:44 -0600)
commit476476e73b14696563524cbc2627a4c033ea64da
treeddd2da016f47be232d02b4fb3be7b4264e7b1043
parent465a67cf529bd2f7a5ca871aff3fa63faa142516
efi: Add support for loading U-Boot through an EFI stub

It is useful to be able to load U-Boot onto a board even if is it already
running EFI. This can allow access to the U-Boot command interface, flexible
booting options and easier development.

The easiest way to do this is to build U-Boot as a binary blob and have an
EFI stub copy it into RAM. Add support for this feature, targeting 32-bit
initially.

Also add a way to detect when U-Boot has been loaded via a stub. This goes
in common.h since it needs to be widely available so that we avoid redoing
initialisation that should be skipped.

Signed-off-by: Simon Glass <sjg@chromium.org>
Improvements to how the payload is built:
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Makefile
arch/x86/config.mk
include/common.h
include/efi.h
lib/efi/Kconfig
lib/efi/Makefile
lib/efi/efi_stub.c [new file with mode: 0644]