Atish Patra [off-list ref] writes:

Currently, last stage boot loaders such as U-Boot can accept only
uImage which is an unnecessary additional step in automating boot flows.

Add a PE/COFF compliant image header that boot loaders can parse and
directly load kernel flat Image. The existing booting methods will continue
to work as it is.

Another goal of this header is to support EFI stub for RISC-V in future.
EFI specification needs PE/COFF image header in the beginning of the kernel
image in order to load it as an EFI application. In order to support
EFI stub, code0 should be replaced with "MZ" magic string and res5(at
offset 0x3c) should point to the rest of the PE/COFF header (which will
be added during EFI support).

This patch is based on ARM64 boot image header and provides an opprtunity
to combine both ARM64 & RISC-V image headers.

Tested on both QEMU and HiFive Unleashed using OpenSBI + U-Boot + Linux.

Signed-off-by: Atish Patra <redacted>

Tested booti support on HiFive Unleashed using OpenSBI + U-Boot (master
branch) + Linux.

Tested-by: Kevin Hilman <khilman@baylibre.com>

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