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>
