[U-Boot] uefi: x86: uboot as uefi payload

[Simon Glass]

Hi Markus,

On 1 December 2016 at 01:58, Markus Valentin <mv at denx.de> wrote:
> Hi Simon,
> Am Mittwoch, den 30.11.2016, 19:20 -0700 schrieb Simon Glass:
>> Hi Markus,
>>
>> On 30 November 2016 at 04:32, Markus Valentin <mv at denx.de> wrote:
>> >
>> > Hi,
>> >
>> > im trying to run u-boot as uefi-payload for qemu this works totally
>> > fine.
>> >
>> > My real target is a Minnowboard Turbot. I did use the
>> > minnowmax_defconfig enabled CONFIG_EFI, CONFIG_EFI_STUB and
>> > CONFIG_EFI_STUB_64BIT. The Board has the latest uefi by Intel
>> > installed(0.93, X64).
>> >
>> > When i load U-Boot as payload for the board-uefi the efi_main
>> > function
>> > gets executed but the call to "cpu_call32" seems to get stuck ( i
>> > think
>> > its at the "retf" arch/x86/cpu/call32.S:37).
>> >
>> > Debuglog:
>> >
>> > Shell> u-boot-payload_64.efi
>> > U-Boot EFI Payload
>> > gdt: 00000047, addr: 00000000784fd570
>> > 00: 00000000  00000000
>> > 08: 00cf9200  0000ffff
>> > 10: 00af9a00  0000ffff
>> > 18: 00cf9300  0000ffff
>> > 20: 00cf9a00  0000ffff
>> > 28: 00000000  00000000
>> > 30: 00cf9200  0000ffff
>> > 38: 00af9b00  0000ffff
>> > 40: 00000000  00000000
>> >  32-bit code segment: 20
>> >  page_table: 79313000
>> >  EFI table at 78787018 size 00000760
>> >
>> > Does anyone have experiences with this issue or with running u-boot
>> > as
>> > uefi-64 payload at all?
>>
>> I have used this on the original Minnowboard and it is used on some
>> broadwell platforms.
> Great so i should be able to get it working too.
>>
>> I did hit a similar problem due to the 'ret' not generating the right
>> instruction. I thought it was fixed but I suppose it is not
>> impossible
>> that the gcc toolchains might generate different op codes in
>> different
>> situations.
>>
>> Which toolchain are you using?
> Im using the gcc6 from Debian/testing,(6.2.0-13) and glibc6 2.24-5.
>
> Can you suggest a Toolchain? Mine is probably too "current"?

I was using 4.9.0 now but I'm not sure if that is what I tested with.
I'll try it again when I get a chance, but it will be a week or so as
I am travelling.

Regards,
Simon