[PATCH 0/6] x86: efi: Add a 64-bit coreboot payload

[Andy Shevchenko]

On Fri, Apr 24, 2020 at 08:01:32AM +0200, Heinrich Schuchardt wrote:
> On 4/23/20 10:05 AM, Bin Meng wrote:
> > Hi Simon,
> >
> > On Mon, Apr 6, 2020 at 7:22 AM Simon Glass <sjg at chromium.org> wrote:
> >>
> >> This series creates a new 64-bit 'coreboot64' build which can be launched
> >> from coreboot. It uses SPL to effect the jump to 64-bit mode.
> >
> > Adding 64-bit U-Boot as a coreboot payload is nice.
> >
> >>
> >> This was done in an attempt to get the Ubuntu FirmwareTestSuite[1]
> >
> > Yet I fail to understand why adding 64-bit U-Boot as the coreboot
> > payload could help running the Ubuntu Firmware Test Suite. Does 32-bit
> > U-Boot as the coreboot payload not work in this case?
> 
> coreboot_defconfig has CONFIG_EFI_LOADER=y so the firmware test suite
> should work fine if you are running a 32 bit OS.
> 
> Of cause calling a 32bit UEFI from a 64bit OS is expected fail due to a
> different ABI.

I'm wonder how Linux (64-bit) kernel with EFI stub enables boots on EFI 32-bit environment?

> >> working. Unfortunately the latest version shows a splash screen and hangs,
> >> perhaps due to some missing EFI support.
> >>
> >> [1] https://wiki.ubuntu.com/FirmwareTestSuite

-- 
With Best Regards,
Andy Shevchenko