[PATCH v4 1/9] x86: fsp: Allow skipping init code when chain loading

[Bin Meng]

On Sun, Apr 26, 2020 at 11:13 PM Simon Glass <sjg at chromium.org> wrote:
>
> It is useful to be able to boot the same x86 image on a device with or
> without a first-stage bootloader. For example, with chromebook_coral, it
> is helpful for testing to be able to boot the same U-Boot (complete with
> FSP) on bare metal and from coreboot. It allows checking of things like
> CPU speed, comparing registers, ACPI tables and the like.
>
> When U-Boot is not the first-stage bootloader much of this code is not
> needed and can break booting. Add checks for this to the FSP code.
>
> Rather than checking for the amount of available SDRAM, just use 1GB in
> this situation, which should be safe. Using 2GB may run into a memory
> hole on some SoCs.
>
> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---
>
> Changes in v4: None
> Changes in v3: None
> Changes in v2: None
>
>  arch/x86/lib/fsp/fsp_dram.c     |  8 ++++++++
>  arch/x86/lib/fsp/fsp_graphics.c |  3 +++
>  arch/x86/lib/fsp2/fsp_dram.c    | 10 ++++++++++
>  arch/x86/lib/fsp2/fsp_init.c    |  2 +-
>  4 files changed, 22 insertions(+), 1 deletion(-)
>

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