[U-Boot] [PATCH v2 20/50] x86: Add support for starting from SPL/TPL

[Bin Meng]

On Fri, Apr 26, 2019 at 12:00 PM Simon Glass <sjg at chromium.org> wrote:
>
> When a previous phase of U-Boot has run we need to adjust the init of
> subsequent states to avoid messing up the CPU state.
>
> Add a new version of the start logic for SPL, when it boots from TPL
> (start_from tpl.c) and a new version for U-Boot when it boots from SPL.
>
> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---
>
> Changes in v2:
> - Add xorl to TPL code also
> - Update comments in start_from_tpl to correctly explain SPL state
>
>  arch/x86/Makefile             | 12 ++++++
>  arch/x86/cpu/Makefile         | 15 +++++++-
>  arch/x86/cpu/start_from_spl.S | 71 +++++++++++++++++++++++++++++++++++
>  arch/x86/cpu/start_from_tpl.S | 49 ++++++++++++++++++++++++
>  4 files changed, 146 insertions(+), 1 deletion(-)
>  create mode 100644 arch/x86/cpu/start_from_spl.S
>  create mode 100644 arch/x86/cpu/start_from_tpl.S
>

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