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

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Message-ID: <20140301202139.GA9759@srcf.ucam.org>
Date:	Sat, 1 Mar 2014 20:21:39 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Li, Aubrey" <aubrey.li@...ux.intel.com>,
	"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 Sat, Mar 01, 2014 at 12:06:39PM -0800, H. Peter Anvin wrote:

> Be careful.  This is *exactly* what I tried back in checkin
> 14d7ca5c575853664d8fe4f225a77b8df1b7de7d.  We had to back that out quite
> quickly.

It's the difference between trying it before the keyboard controller and 
trying it after the keyboard controller and ACPI. It seems that it broke 
some systems where the keyboard controller worked - if we've hit the 
keyboard controller and ACPI twice, and the system is still alive, and 
if we have standard PCI ports, it doesn't seem like poking them is 
likely to make anything actively worse.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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