linux-kernel - Re: [patch] x86: Introduce BOOT_EFI and BOOT

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Message-ID: <53129256.6060704@zytor.com>
Date:	Sat, 01 Mar 2014 18:07:18 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Li, Aubrey" <aubrey.li@...ux.intel.com>,
	Matthew Garrett <mjg59@...f.ucam.org>
CC:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	"alan@...ux.intel.com" <alan@...ux.intel.com>,
	linux-kernel@...r.kernel.org, Len.Brown@...el.com,
	Adam Williamson <awilliam@...hat.com>
Subject: Re: [patch] x86: Introduce BOOT_EFI and BOOT_CF9 into the reboot
 sequence loop

On 03/01/2014 05:47 PM, Li, Aubrey wrote:
> 
> Since we are not able to make things worse, let's make it better. So
> Let's dig into this. For the machine hangs by CF9, it's known to work by
> KBD, right? For the machine hangs by BIOS, do you know which method will
> make reboot work?
> 

No.

> The answer will determine the sequence of the list. If BIOS hangs but
> either of ACPI/KBD/EFI/CF9 works, BIOS is behind of those ways. If BIOS
> hangs, no any other way can make it work. BIOS is still the last way.
> 
> If CF9 hangs while ACPI/KBD hangs as well, and BIOS happened to work(do
> we really have one?), the above list still doesn't make things worse,
> reboot=b and dmidecode table still work.

We obviously have been over this a number of times, and the sad thing is
that we have very limited information.  It is more complex than that,
even... I believe in some cases KBD works but it is slow, and so takes a
while.

	-hpa


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