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

[Markus Valentin]

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"? 

Regards 
Markus
-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-60 Fax: (+49)-8142-66989-80 Email: mv at denx.de