linux-kernel - Re: [tip:x86/reboot] [PATCH] x86: Try the BIOS reboot method before the PCI reboot method

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Date:	Fri, 04 Apr 2014 08:09:30 -0700
From:	Adam Williamson <awilliam@...hat.com>
To:	"Li, Aubrey" <aubrey.li@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...nel.org>, hpa@...or.com,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	mjg59@...f.ucam.org, rostedt@...dmis.org, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/reboot] [PATCH] x86: Try the BIOS reboot method before
 the PCI reboot method

On Fri, 2014-04-04 at 21:38 +0800, Li, Aubrey wrote:
> <cc to adam>
> 
> On 2014/4/4 16:00, Ingo Molnar wrote:
> > 
> >>
> >> [PATCH] x86: Try the BIOS reboot method before the PCI reboot method
> > 
> > So, JFYI, I have put this into x86/reboot to get it tested, but it's 
> > not queued up for upstream yet until there's concensus.
> > 
> > (Steve testing it wouldn't hurt either.)
> > 
> > Thanks,
> > 
> > 	Ingo
> 
> The change is originated from the following bug:
> https://bugzilla.kernel.org/show_bug.cgi?id=70931
> 
> The system will hang after BIOS or TRIPLE if it doesn't work, that's why
> I added CF9 before BIOS and TRIPLE.
> 
> Adam may want to try this change to see if reboot works on his DELL
> Venue 8 Pro.
> 
> I don't think there is enough justification to revert the patch. We
> introduce EFI into the default list, we didn't see any reason to remove
> it out so far.

AIUI the bottom line for Baytrail-y devices is that they'll be OK so
long as EFI is tried before anything which causes a hang, right?

I can try patches out for sure and confirm, but it'd be good to have a
definite candidate. Are we considering the first patch alone -
https://patchwork.kernel.org/patch/3937101/ - or also the second patch -
https://patchwork.kernel.org/patch/3937091/ ?
-- 
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Twitter: AdamW_Fedora | XMPP: adamw AT happyassassin . net
http://www.happyassassin.net

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