[U-Boot] [PATCH v3 07/10] x86: Support a chained-boot development flow

[Bin Meng]

On Thu, Mar 17, 2016 at 9:39 AM, Bin Meng <bmeng.cn at gmail.com> wrote:
> On Wed, Mar 16, 2016 at 9:44 PM, Simon Glass <sjg at chromium.org> wrote:
>> Sometimes it is useful to jump into U-Boot directly from coreboot or UEFI
>> without any 16-bit init. This can help during development by allowing U-Boot
>> to avoid doing all the init required by the platform.
>>
>> U-Boot expects its GDT to be set up correctly by its 16-bit code. If
>> coreboot doesn't do this (because it hasn't run the payload setup code yet)
>> then this won't happen.
>>
>> In this case we cannot rely on the GDT settings. U-Boot will hang or crash
>> if these are wrong. Provide a development-only option to set up the GDT
>> correctly. This is just a hack so you can jump to U-Boot from any stage of
>> coreboot, not just at the end.
>>
>> Signed-off-by: Simon Glass <sjg at chromium.org>
>> ---
>>
>> Changes in v3:
>> - Add more detail to the commit message and code comments
>>
>> Changes in v2: None
>>
>>  arch/x86/cpu/start.S | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 80 insertions(+)
>>
>
> Reviewed-by: Bin Meng <bmeng.cn at gmail.com>

applied to u-boot-x86, thanks!