Messages in this thread | | | Date | Sun, 06 Apr 2014 11:40:04 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [tip:x86/reboot] [PATCH] x86: Try the BIOS reboot method before the PCI reboot method |
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On 04/06/2014 10:40 AM, One Thousand Gnomes wrote: > On Fri, 4 Apr 2014 16:13:59 +0100 > Matthew Garrett <mjg59@srcf.ucam.org> wrote: > >> On Fri, Apr 04, 2014 at 09:38:57PM +0800, Li, Aubrey wrote: >> >>> 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. >> >> We should be using the EFI method, yes. But it seems that CF9 isn't >> safe, so we should drop that. >> > > Windows does not use CF9 and there are known, documented cases where CF9 > will not work reliably. That includes reliable reboot on some Baytrail > systems. (Erratum VLT60 and VLT62). > > So we really shouldn't be doing 0xCF9 except as a last resort if we are > still alive and have been through the official reboot methods. >
No question. The question at hand is if we should do it after all other non-terminal (BIOS, triple) methods have been tried.
-hpa
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