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SubjectRe: 2.6.27.7 built for Geode: Clock drift
Harald Dunkel wrote:
> Hi folks,
>
> If I build a kernel for AMD Geode, then I see a clock drift of appr.
> 30 min. to 1 hour per day. If I build the same kernel for i486, then
> the clock drift is gone. Running ntp makes no difference.
>
> Hardware is a Linutop PC. /proc/cpuinfo says
>
> processor : 0
> vendor_id : AuthenticAMD
> cpu family : 5
> model : 10
> model name : Geode(TM) Integrated Processor by AMD PCS
> stepping : 2
> cpu MHz : 0.000
> cache size : 128 KB
> fdiv_bug : no
> hlt_bug : no
> f00f_bug : no
> coma_bug : no
> fpu : yes
> fpu_exception : yes
> cpuid level : 1
> wp : yes
> flags : fpu de pse tsc msr cx8 sep pge cmov clflush mmx mmxext 3dnowext 3dnow
> bogomips : 429.05
> clflush size : 32
> power management:
>
> BTW, the CPU is running with 500 MHz (AFAIK). 0.000 MHz is surely not
> correct. /proc/cpuinfo reports the same for both kernels.

Hmm - we've heard reports of this before, but nothing came of it. I
would be interested in a chance to debug it this time.

Please try turning off CONFIG_GEODE_MFGPT_TIMER=y and try again. Also,
try something in the 2.6.28 family to rule out fixes in the timer subsystem.

Thanks,
Jordan


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