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

[Loys Ollivier]

On Thu 23 May 2019 at 21:18, Atish Patra <atish.patra@xxxxxxx> 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 <atish.patra@xxxxxxx>
> Reviewed-by: Karsten Merker <merker@xxxxxxxxxx>
> Tested-by: Karsten Merker <merker@xxxxxxxxxx> (QEMU+OpenSBI+U-Boot)
Tested-by: Loys Ollivier <lollivier@xxxxxxxxxxxx>