Re: [v3 PATCH] RISC-V: Add a PE/COFF compliant Image header.
From: Kevin Hilman
Date: Wed Jun 05 2019 - 12:04:47 EST
Atish Patra <atish.patra@xxxxxxx> 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 <atish.patra@xxxxxxx>
Tested booti support on HiFive Unleashed using OpenSBI + U-Boot (master
branch) + Linux.
Tested-by: Kevin Hilman <khilman@xxxxxxxxxxxx>