[PATCH v5 1/1] x86: Add a 64-bit 'coreboot64' build

[Bin Meng]

On Fri, May 1, 2020 at 9:36 PM Simon Glass <sjg at chromium.org> wrote:
>
> Coreboot is a first-stage bootloader mostly used on x86 devices as an
> alternative to UEFI. Coreboot runs in 32-bit mode.
>
> U-Boot currently supports booting from coreboot as a second-stage
> bootloader, also in 32-bit mode. However it is useful to be able to run
> U-Boot in 64-bit mode. To do this we can have a 32-bit SPL which switches
> over the CPU and jumps to a 64-bit U-Boot proper.
>
> Add a new 'coreboot64' board for running 64-bit U-Boot from coreboot. This
> uses binman to create an image with a 32-bit SPL and a 64-bit U-Boot.
>
> This allows running 64-bit EFI images on x86, for example, without needing
> a native U-Boot port for a board.
>
> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---
>
> Changes in v5:
> - Rewrite commit message to explain what coreboot is
>
>  board/coreboot/coreboot/MAINTAINERS |  7 +++++
>  configs/coreboot64_defconfig        | 48 +++++++++++++++++++++++++++++
>  doc/board/coreboot/coreboot.rst     | 10 ++++++
>  3 files changed, 65 insertions(+)
>  create mode 100644 configs/coreboot64_defconfig
>

Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
Tested-by: Bin Meng <bmeng.cn at gmail.com>