bzImage under x86_64 UEFI app mode.

[Christian Melki]

Hi.

I'm trying the new UEFI-app mode where I rely on EFI services to give me
access to things like block devices etc. I'm currently using
2022.04-rc1. So far so good. I can start U-boot and the efi block device
works just fine.

But I'm not succeeding in booting a regular bzImage.
This kernel (5.16.4) configuration works on both the physical hardware
and an UEFI x86_64 VBox instance using Barebox 2021.08, so kernel
configuration should in theory be ok. It's a bzImage with a efistub.

I can load a kernel or kernel+initrd baked in, verify the data and use
zboot on the loadaddr. zboot does not complain afaics.
The kernel however, does not seem to make it very far.

Valid Boot Flag
Setup Size = 0x00003a00
Magic signature found
Using boot protocol version 2.0f
Linux kernel version 5.16.4 (ptxdist at ptxdist) #4 SMP PREEMPT
2022-02-01T00:00:00+00:00
Building boot_params at 0x00090000
Loading bzImage at address 100000 (69330784 bytes)
Initial value for argc=3
Final value for argc=3
Initial value for argc=3
Final value for argc=3
Setup E820 entries
Setup cmdline
Kernel command line:console=$(console) rdinit=/sbin/init quiet rw
secpboot=factoryimage
Kernel command line: "console=tty0 rdinit=/sbin/init quiet rw
secpboot=factoryimage"
Setup devicetree
Kernel loaded at 00100000, setup_base=0000000000090000

Starting kernel ...

tsc-timer: When removing: flags=600, drv->flags=0, err=-129
serial: When removing: flags=600, drv->flags=0, err=-129
efi-fb.vidconsole0: When removing: flags=600, drv->flags=0, err=-129
efi-fb: When removing: flags=600, drv->flags=0, err=-129
efi_media.blk: When removing: flags=600, drv->flags=0, err=-129
efi_media_0: When removing: flags=600, drv->flags=0, err=-129
root_driver: When removing: flags=600, drv->flags=0, err=-129
!!!! X64 Exception Type - 0D(#GP - General Protection)  CPU Apic ID -
00000000 !!!!
ExceptionData - 0000000000000000
RIP  - 000000000010001A, CS  - 0000000000000038, RFLAGS - 0000000000010006
RAX  - 000000000431E490, RCX - 0000000000000000, RDX - 00000000FFFFFFFB
RBX  - 0000000000000000, RSP - 00000000000901E8, RBP - 0000000000100000
RSI  - 0000000000090000, RDI - 0000000000000000
R8   - 0000000000000020, R9  - 000000000000000A, R10 - 000000000000000D
R11  - 0000000000000008, R12 - 0000000000090000, R13 - 00000000DB2372C8
R14  - 00000000D9D0D9D8, R15 - 00000000FFFFFFFF
DS   - 0000000000000030, ES  - 0000000000000030, FS  - 0000000000000030
GS   - 0000000000000030, SS  - 0000000000000030
CR0  - 00000000C0010033, CR2 - 0000000000000000, CR3 - 00000000DB001000
CR4  - 0000000000000668, CR8 - 0000000000000000
DR0  - 0000000000000000, DR1 - 0000000000000000, DR2 - 0000000000000000
DR3  - 0000000000000000, DR6 - 00000000FFFF0FF0, DR7 - 0000000000000400
GDTR - 00000000DAFF2018 0000000000000047, LDTR - 0000000000000000
IDTR - 00000000DAC04018 0000000000000FFF,   TR - 0000000000000000
FXSAVE_STATE - 000000000008FE40
!!!! Can't find image information. !!!!

Hints?