Xen users - Aug 2010 - No access to hwclock on Dom0 / Xen 4.0.1-rc5-pre / pv_ops 2.6.31.13

Hello all,

I recently installed Xen 4.0.1-rc5-pre on CentOS 5.5 from the xen-4.0-testing
repo. Everything seems to be working good; got it running with 2.6.31.13 pv_ops
kernel, been testing the Xen API, pv-grub, Windows HVM with the WHQL certified
pv drivers.

Now I have realised that Dom-0''s cmos clock is 3 hours out. So I
attempt to correct it locally, then push the changes to the hardware clock. I
run the following command on Domain-0.

Here''s what happens:
[root@indigo ~]# hwclock --systohc
Cannot access the Hardware Clock via any known method.
Use the --debug option to see the details of our search for an access method.
[root@indigo ~]# 

I was able to use the hwclock command fine before booting the Xen pv_ops kernel.
I have gone through kernel config lines and ensured that CONFIG_RTC_...etc is
enabled, have tried compiling the modules for rtc drivers and loading them one
by one but to no avail.

Any input would be greatly appreciated.

Thanks.

Iain Kay

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On Mon, Aug 2, 2010 at 12:57 AM, Iain Kay <i.kay@me.com>
wrote:
> Here''s what happens:
> [root@indigo ~]# hwclock --systohc
> Cannot access the Hardware Clock via any known method.
> Use the --debug option to see the details of our search for an access
method.
> [root@indigo ~]#
>
> I was able to use the hwclock command fine before booting the Xen pv_ops
kernel. I have gone through kernel config lines and ensured that
CONFIG_RTC_...etc is enabled, have tried compiling the modules for rtc drivers
and loading them one by one but to no avail.
>
> Any input would be greatly appreciated.
Try this:
mv /dev/rtc /dev/rtc.old
cp -a /dev/rtc0 /dev/rtc
hwclock --systohc

-- 
Fajar

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Fajar,

You are a star! That did the trick.

Unfortunately it won''t persist after reboot but adding those lines to
/etc/rc.local is a nice quick fix.

Thanks again.


Iain Kay


On 1 Aug 2010, at 19:06, Fajar A. Nugraha wrote:
> On Mon, Aug 2, 2010 at 12:57 AM, Iain Kay <i.kay@me.com> wrote:
>> Here''s what happens:
>> [root@indigo ~]# hwclock --systohc
>> Cannot access the Hardware Clock via any known method.
>> Use the --debug option to see the details of our search for an access
method.
>> [root@indigo ~]#
>> 
>> I was able to use the hwclock command fine before booting the Xen
pv_ops kernel. I have gone through kernel config lines and ensured that
CONFIG_RTC_...etc is enabled, have tried compiling the modules for rtc drivers
and loading them one by one but to no avail.
>> 
>> Any input would be greatly appreciated.
> 
> Try this:
> mv /dev/rtc /dev/rtc.old
> cp -a /dev/rtc0 /dev/rtc
> hwclock --systohc
> 
> -- 
> Fajar

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