v4.7-rc2 kernel fails to boot when acpi=force

[mark.rutland@arm.com (Mark Rutland)]

On Tue, Jun 07, 2016 at 07:53:53PM +0900, Itaru Kitayama wrote:
> Mark
> 
> On 6/7/16 7:23 PM, Mark Rutland wrote:
> >On Tue, Jun 07, 2016 at 05:06:39PM +0900, Itaru Kitayama wrote:
> >>Upstream v4.7-rc2 kernel does not boot if parameter acpi is set to force
> >>on Overdrive. (acpi=off gets to the prompt)
> >
> >Did acpi=force work on this board with an earlier kernel (e.g. v4.6)?
> 
> v4.6 boots fine with acpi=foce.

Ok.

> >>When set to force it doesn't get to the Linux boot process and stalls.
> >
> >What output do you get before it stalls?
> >
> >I assume that you at least have output from the EFI stub?
> 
> Yes.

Do you get anything else? A full log woould be helpful.

> >Which command line options are you passing?
> 
> At the time of trying, only acpi=foce efi=debug
 
> >If you get nothing after the stub, try also passing:
> >
> >earlycon=pl011,0xe1010000
> 
> Adding it in the /etc/default/grub file and updating grub via
> mkgrub2-config seems to made the board always falls on the grub prompt.
> I am able to switch to the EFI shell, but is there an easy way to
> recover it? (I'm accessing the board remotely)

If you can open GRUB, press 'e', and you can edit the command line.

If GRUB doesn't work at all, you might be able to use the 'edit' command
to modify the GRUB onfiguration file.

Thanks,
Mark.

> >Which may give an indication of what's going on.
> >
> >>Here's the BIOS info:
> >>
> >>Version 2.17.1249. Copyright (C) 2015 American Megatrends, Inc.
> >>BIOS Date: 09/03/2015 13:52:32 Ver: ROD0084E00
> >
> >I don't know if the FW from a year ago provided everything necessary. It
> >may be something like the SPCR is simply missing, and there's no
> >console= passed to the kernel.
> >
> >Thanks,
> >Mark.
> >
>