Re: Kernel V5.7-rc1 doesn't boot (EFI?)

[Ard Biesheuvel]

On Tue, 14 Apr 2020 at 18:32, JÃrg Otte <jrg.otte@xxxxxxxxx> wrote:
>
> Am Di., 14. Apr. 2020 um 12:50 Uhr schrieb Ard Biesheuvel <ardb@xxxxxxxxxx>:
> >
> > On Tue, 14 Apr 2020 at 12:40, JÃrg Otte <jrg.otte@xxxxxxxxx> wrote:
> > >
> > > Booting my notebook with kernel V57-rc1 I get following
> > > display:
> > >
> > > exit_boot() failed!
> > > efi_main() failed!
> > > StartImage failed: Buffer Too Small
> > >
> > > Booting Kernel V5.6 works well.
> > >
> > > From dmesg (kernel V5.6):
> > > efi: EFI v2.31 by Phoenix Technologies Ltd.
> > > efi:  ACPI=0xdcffe000  ACPI 2.0=0xdcffe014  SMBIOS=0xdce80000  RNG=0xdc3cd198
> > > efi: seeding entropy pool
> > > efi: [Firmware Bug]: Invalid EFI memory map entries:
> > > efi: mem47: [Reserved           |   |  |  |  |  |  |  |  |   |  |  |
> > > |  ] range=[0x0000000000000000-0x0000000000000000] (invalid)
> > > efi: mem48: [Reserved           |   |  |  |  |  |  |  |  |   |  |  |
> > > |  ] range=[0x0000000000000000-0x0000000000000000] (invalid)
> > > efi: mem49: [Reserved           |   |  |  |  |  |  |  |  |   |  |  |
> > > |  ] range=[0x0000000000000000-0x0000000000000000] (invalid)
> > > efi: mem50: [Reserved           |   |  |  |  |  |  |  |  |   |  |  |
> > > |  ] range=[0x0000000000000000-0x0000000000000000] (invalid)
> > > efi: mem51: [Reserved           |   |  |  |  |  |  |  |  |   |  |  |
> > > |  ] range=[0x0000000000000000-0x0000000000000000] (invalid)
> > > efi: Removing 5 invalid memory map entries.
> > >
> >
> > Thanks for the report.
> >
> > Can you try booting with efi=no_disable_early_pci_dma passed via the
> > kernel command line? [*]
> >
> Yes, that works!
>
> > If that does not help, can you try to reproduce with this branch?
> >
> > https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/log/?h=efi/urgent
>
> Should I give that branch a try anyway?
>

Your test proves that BSS is not being cleared correctly, so I have
the answer I was looking for. However, I would appreciate it if you
could test that branch, just to double check.

Thanks,
Ard.