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

[Markus Valentin]

Hi Simon,
On Sun, 2016-12-04 at 23:24 -0700, Simon Glass wrote:
> 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.

I was not a matter of the the toolchain my SYS_TEXT_BASE was wrong 
(0xfff00000) for unknown reason.  

Once i created my own defconfig-file which sets the required KConfig-
variables, the default from board/intel/minnowmax/Kconfig gets
properly applied  I did use menuconfig before which did somehow not 
put the changes to the .config file.

Regards
Markus

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