Re: [Xen-devel] [PATCH] x86: Don't honour ACPI indicating absence of CMOS RTC

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.06.14 at 18:31, <konrad.wilk@xxxxxxxxxx> wrote:
> On Tue, Jun 17, 2014 at 05:01:12PM +0100, Jan Beulich wrote:
>> >>> On 17.06.14 at 17:47, <konrad.wilk@xxxxxxxxxx> wrote:
>> > On Tue, Jun 17, 2014 at 04:12:32PM +0100, Jan Beulich wrote:
>> >> >>> On 17.06.14 at 16:58, <andrew.cooper3@xxxxxxxxxx> wrote:
>> >> > This reverts f74556693 "x86: honor ACPI indicating absence of CMOS RTC"
>> >> > 
>> >> > Certain HP Gen8 BIOSes have started setting this bit despite an RTC 
>> >> > CMOS 
>> >> > being present and working.
>> >> > 
>> >> > Their reasonsing is to prevent EFI-booted OSes from playing with the 
>> >> > CMOS,
>> >> > combined with the erroneous assumption that the only OSes using legacy 
> boot
>> >> > are too old to know about ACPI v5 and therefore to understand this bit.
>> >> 
>> >> Which implies you can boot from EFI on those systems, which is
>> >> precisely what the panic message says you ought to do. Why do
>> >> you not boot via EFI in the first place?
>> > 
>> > You can swap between legacy and EFI in the BIOS. Customers can choose
>> > either option.
>> 
>> I know on many systems you still can, but the question is "Why would
>> you?" In particular when you know the firmware is assuming that the
>> CSM is only being used by old OSes.
> 
> PCIe devices that don't EFI for setting up.

I'm sorry, but I don't understand what you're trying to tell me.

Jan


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