Re: [patch] x86: Introduce BOOT_EFI and BOOT_CF9 into the reboot sequence loop

[H. Peter Anvin]

On 03/01/2014 04:26 PM, Li, Aubrey wrote:
>>
>> On March 1, 2014 12:21:39 PM PST, Matthew Garrett <mjg59@xxxxxxxxxxxxx> wrote:
>>> 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.
>>
> This is exactly what I'm trying to express. thanks Matt. It doesn't make
> anything worse, it makes reboot working on some systems.
> 
> On 2014/3/2 4:26, H. Peter Anvin wrote:
>> True... trying cf9_cond with low priority probably makes sense.
> 
> I'm not asking CF9 only, I'm asking all of the known method in reboot.c.
> So, BIOS is appliable as well with the same logic and with low priority,
> isn't it?
> 

The problem comes in when a method doesn't just not work, but hangs the
machine.  BIOS *WILL* hang the machine if it doesn't work.  CF9 has been
known to hang the machine.

	-hpa


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