Re: [Xen-devel] [PATCH] fix the time issue on x86_64

[Jerone Young <jyoung5@xxxxxxxxxx>]

Glad to see the fix was that easy. I really though that this would
require a lot more work then this to have this work :-).

On Fri, 2005-06-10 at 02:45 +0800, Li, Xin B wrote:
> For x86_64, we must have a RTC driver compiled in kernel.
> I compiled a native x86_64 Linux kernel without any RTC driver support,
> and the native Linux kernel also has the same time issue.
> If we run hwclock, we get
>       Cannot access the Hardware Clock via any known method.
>       Use the --debug option to see the details of our search for an
> access method.
> If this command fails, /etc/rc.d/rc.sysinit can not set kernel time (by
> calling syscall settimeofday()) correctly.
> 
> And after adding CONFIG_RTC to xeno64 default config file, the time
> issue is gone.
> But for i386, this is not a must, for it has some other way to get the
> RTC time.
> 
> Following is the patch:
> 
> # This is a BitKeeper generated diff -Nru style patch.
> #
> # ChangeSet
> #   2005/06/08 23:59:01-07:00 xin@xxxxxxxxxxxxxxxxxxxxxx
> #   fix time issue bug on x86_64
> #   Signed-off-by: Li B Xin <li.b.xin@xxxxxxxxx>
> #   Signed-off-by: Jun Nakajima <jun.nakajima@xxxxxxxxx>
> #
> # linux-2.6.11-xen-sparse/arch/xen/configs/xen0_defconfig_x86_64
> #   2005/06/08 23:59:00-07:00 xin@xxxxxxxxxxxxxxxxxxxxxx +1 -1
> #   fix time issue bug by adding RTC driver support.
> #   x86_64 must have a RTC driver support, or we can not run hwclock
> successfully, so we can not set a correct time to kernel.
> #   Signed-off-by: Li B Xin <li.b.xin@xxxxxxxxx>
> #   Signed-off-by: Jun Nakajima <jun.nakajima@xxxxxxxxx>
> #
> diff -Nru
> a/linux-2.6.11-xen-sparse/arch/xen/configs/xen0_defconfig_x86_64
> b/linux-2.6.11-xen-sparse/arch/xen/configs/xen0_defconfig_x86_64
> --- a/linux-2.6.11-xen-sparse/arch/xen/configs/xen0_defconfig_x86_64
> 2005-06-09 00:02:32 -07:00
> +++ b/linux-2.6.11-xen-sparse/arch/xen/configs/xen0_defconfig_x86_64
> 2005-06-09 00:02:32 -07:00
> @@ -701,7 +701,7 @@
>  # CONFIG_WATCHDOG is not set
>  # CONFIG_HW_RANDOM is not set
>  # CONFIG_NVRAM is not set
> -# CONFIG_RTC is not set
> +CONFIG_RTC=y
>  # CONFIG_GEN_RTC is not set
>  # CONFIG_DTLK is not set
>  # CONFIG_R3964 is not set
> 
> 
> thanks
> -Xin
> 
> _______________________________________________
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> http://lists.xensource.com/xen-devel
> 
-- 
Jerone Young
IBM Linux Technology Center
jyoung5@xxxxxxxxxx
512-838-1157 (T/L: 678-1157)


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