Re: [PATCH 15/15] riscv: disable the EFI PECOFF header for M-mode

Troy Benjegerdes
2019-08-21T04:14:48Z

> On Aug 13, 2019, at 8:47 AM, Christoph Hellwig <hch@lst.de> wrote:
>
> No point in bloating the kernel image with a bootloader header if
> we run bare metal.

I would say the same for S-mode. EFI booting should be an option, not
a requirement. I have M-mode U-boot working with bootelf to start BBL,
and at some point, I’m hoping we can have a M-mode linux kernel be
the SBI provider for S-mode kernels, which seem most logical to me
to start using the vmlinux elf binaries using something like kexec()

>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
> arch/riscv/kernel/head.S | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
> index 670e5cacb24e..09fcf3d000c0 100644
> --- a/arch/riscv/kernel/head.S
> +++ b/arch/riscv/kernel/head.S
> @@ -16,6 +16,7 @@
>
> __INIT
> ENTRY(_start)
> +#ifndef CONFIG_M_MODE
> /*
> * Image header expected by Linux boot-loaders. The image header data
> * structure is described in asm/image.h.
> @@ -47,6 +48,7 @@ ENTRY(_start)
>
> .global _start_kernel
> _start_kernel:
> +#endif /* CONFIG_M_MODE */
> /* Mask all interrupts */
> csrw CSR_XIE, zero
> csrw CSR_XIP, zero
> --
> 2.20.1
>
>
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