Re: [Xen-users] kernel 4.4: rtc_cmos stopped working in dom0

[Roger Pau Monnà <roger.pau@xxxxxxxxxx>]

El 10/2/16 a les 12:11, Jerome LE GALLIC ha escrit:
>  hi,
> I have the same problem on domu kernel 3.16.0.4-amd64 or kernel 4.3.0-1-amd64 
> with error
> 
> platform rtc_cmos: registered platform RTC device (no PNP device found)
> [ 1.415493] rtc_cmos rtc_cmos: rtc core: registered rtc_cmos as rtc0
> [ 1.415577] rtc_cmos: probe of rtc_cmos failed with error -38
> [ 1.416475] rtc_hctosys: unable to open rtc device (rtc0)

This is expected, RTC is not available to DomUs, the PV wall clock is
provided, which should accomplish the same task.

>> Message du 02/02/16 01:06
>> De : "Sven KÃhler" 
>> A : xen-users@xxxxxxxxxxxxxxxxxxx
>> Copie à : 
>> Objet : Re: [Xen-users] kernel 4.4: rtc_cmos stopped working in dom0
>>
>> Any clue what's going on? rtc_cmos works fine with previous kernels on
>> the same hardware.
>>
>> Am 24.01.2016 um 00:09 schrieb Sven KÃhler:
>>> Hi,
>>>
>>> since I upgraded by test machine's kernel to 4.4, rtc_cmos won't work
>>> anymore. In consequence, hwclock --show terminates with an error. In
>>> dmesg, I see the following error message:
>>>
>>> rtc_cmos: probe of rtc_cmos failed with error -22
>>>
>>>
>>> Is dom0 not supposed to control the CMOS clock?

No, Dom0 should have access to the RTC. Which version of Xen are you using?

Roger.


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