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

[Markus Valentin]

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?

regard Markus
 
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