[RESEND PATCH v3 0/7] x86: Improve support for chain-loading U-Boot

[Bin Meng]

Hi Simon,

On Thu, Apr 9, 2020 at 2:58 AM Simon Glass <sjg at chromium.org> wrote:
>
> This little series adds a few checks into the code to allow better
> operation when booting a build from a previous-state loader such as
> coreboot.
>
> At present we have a 'coreboot' target but this runs very different code
> from the bare-metal targets, such as coral. There is very little in common
> between them.
>
> It is useful to be able to boot the same U-Boot 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.
>
> This series allows U-Boot to detect that it ran from coreboot and
> automatically do the right thing.
>
> This series makes the most important changes to allow the same u-boot.bin
> for coral to boot after coreboot (by itself) or bare metal (via TPL->SPL).
>
> Changes in v3:
> - Add a new patch with a gd flag for chain loading
> - Add new patch to detect running from coreboot

Sorry it took me some time to have a look at this series. I have some
comments against 5 & 6.

Could you please update doc/arch/x86.rst for the purpose and usage of
the chain loading?

Regards,
Bin