Commit 0f327f2a authored by Committed by Paul WalmsleyBrowse files
RISC-V: Add an Image header that boot loader can parse.
Currently, the last stage boot loaders such as U-Boot can accept only uImage which is an unnecessary additional step in automating boot process. Add an image header that boot loader understands and boot Linux from flat Image directly. This header is based on ARM64 boot image header and provides an opportunity to combine both ARM64 & RISC-V image headers in future. Also make sure that PE/COFF header can co-exist in the same image so that EFI stub can be supported 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 res4(at offset 0x3c) should point to the rest of the PE/COFF header (which will be added during EFI support). Tested on both QEMU and HiFive Unleashed using OpenSBI + U-Boot + Linux. Signed-off-by: Atish Patra <firstname.lastname@example.org> Reviewed-by: Karsten Merker <email@example.com> Tested-by: Karsten Merker <firstname.lastname@example.org> (QEMU+OpenSBI+U-Boot) Tested-by: Kevin Hilman <email@example.com> (OpenSBI + U-Boot + Linux) [firstname.lastname@example.org: fixed whitespace in boot-image-header.txt; converted structure comment to kernel-doc format and added some detail] Signed-off-by: Paul Walmsley <email@example.com>