Hi Simon,
On Sun, Nov 20, 2016 at 4:25 AM, Simon Glass <s...@chromium.org> wrote:
> These are currently not supported. Calling 64-bit code from 64-bit U-Boot is
> much simpler, so this code is not needed. setjmp() is not yet implemented for
> 64-bit.
>
> Signed-off-by: Simon Glass <s...@chromium.org>
> ---
>
> Changes in v2: None
>
> arch/x86/cpu/Makefile | 6 +++++-
> arch/x86/lib/bootm.c | 2 ++
> 2 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/cpu/Makefile b/arch/x86/cpu/Makefile
> index 7f89ff0..f0135a7 100644
> --- a/arch/x86/cpu/Makefile
> +++ b/arch/x86/cpu/Makefile
> @@ -14,7 +14,11 @@ else
> extra-y = start.o
> endif
> extra-$(CONFIG_$(SPL_)X86_16BIT_INIT) += resetvec.o start16.o
> -obj-y += cpu.o cpu_x86.o call64.o setjmp.o
> +ifndef CONFIG_$(SPL_)X86_64
> +obj-y += call64.o setjmp.o
> +endif
> +
> +obj-y += cpu.o cpu_x86.o
>
> AFLAGS_REMOVE_call32.o := -mregparm=3 \
> $(if $(CONFIG_EFI_STUB_64BIT),-march=i386 -m32)
> diff --git a/arch/x86/lib/bootm.c b/arch/x86/lib/bootm.c
> index 80fadef..4ac01a3 100644
> --- a/arch/x86/lib/bootm.c
> +++ b/arch/x86/lib/bootm.c
> @@ -150,7 +150,9 @@ int boot_linux_kernel(ulong setup_base, ulong
> load_address, bool image_64bit)
> puts("Cannot boot 64-bit kernel on 32-bit machine\n");
> return -EFAULT;
> }
> +#if !CONFIG_IS_ENABLED(X86_64)
> return cpu_jump_to_64bit(setup_base, load_address);
Can we add a comment here mentioning booting 64-bit kernel is not
supported? Also, do we plan to support 64-bit U-Boot booting 32-bit
kernel? I guess no?
> +#endif
> } else {
> /*
> * Set %ebx, %ebp, and %edi to 0, %esi to point to the
> --
Regards,
Bin
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