U-Boot zboot on x86-64 VirtualBox UEFI.

[Simon Glass]

Hi Christian,

On Fri, 11 Jun 2021 at 23:59, Christian Melki
<christian.melki at t2data.com> wrote:
>
> On 6/11/21 3:40 PM, Simon Glass wrote:
> > +Heinrich Schuchardt
> >
> > Hi Christian,
> >
> > On Fri, 11 Jun 2021 at 07:30, Christian Melki
> > <christian.melki at t2data.com> wrote:
> >>
> >> Hi.
> >>
> >> I have been trying to boot a bzImage with zboot from a VirtualBox UEFI
> >> instance -> U-Boot UEFI payload. So far I've been using 2021.07-rc1. I'd
> >> like to try a newer rc, but even if built exactly the same with the same
> >> .config, newer won't boot as an UEFI payload. So right now, I'm stuck at
> >> rc1.
> >>
> >> Anyway.
> >> The kernel in question starts when configured with an EFI stub from the
> >> UEFI shell.
> >>
> >> U-boot fails to boot the bzImage from the console using zboot though.
> >> Just freezes after "Starting kernel..."
> >
> > We don't actually have tests for this in CI at present.
> >
> > I don't see any changes in the zboot stuff though. There is quite a
> > bit in efi_loader. You could perhaps try a bisect.
>
> I can live with 2021.07-rc1 right now as it atleast starts as an UEFI
> payload.
> But my big issue is that I can't start the kernel with zboot.
> Full debug build isn't that much more informative either.
> I was thinking different load offsets, but mine seems pretty much
> standard, so I don't know. I've played around a bit with configuration
> on both halves, but it doesn't help.
>
> >
> > Heinrich, do you have any ideas?
> >
> >>
> >> zboot 01080000 - 04000000 319c000
> >> Valid Boot Flag
> >> Magic signature found
> >> Linux kernel version 5.12.0 (ptxdist at ptxdist) #2 SMP PREEMPT
> >> 2021-06-01T00:00:00+00:00
> >> Building boot_params at 0x00090000
> >> Loading bzImage at address 100000 (6516096 bytes)
> >> Initial RAM disk at linear address 0x04000000, size 52019200 bytes
> >> Kernel command line: "console=ttyS0,115200 rw quiet"
> >> Kernel loaded at 00100000, setup_base=00090000
> >>
> >> Starting kernel ...
> >>
> >> Any ideas?

Can you make sure that U-Boot is not writing out SMBIOS or other
tables? It should be letting the kernel use the ones written by UEFI I
think.

Also start linux with a serial console and early printk or whatever it
is called these days.

Regards,
Simon