Re: [v4 PATCH] RISC-V: Add an Image header that boot loader can parse.

On Thu 23 May 2019 at 21:18, Atish Patra [off-list ref] wrote:

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.

Thanks Atish, happy to have this support that makes the boot process
more straightforward.
Tested on HiFive Unleashed using OpenSBI + U-Boot v2019.07-rc2 + Linux.

Signed-off-by: Atish Patra <redacted>
Reviewed-by: Karsten Merker <redacted>
Tested-by: Karsten Merker <redacted> (QEMU+OpenSBI+U-Boot)

Tested-by: Loys Ollivier <redacted>

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