Messages in this thread | | | Date | Tue, 17 Nov 2009 12:10:23 -0500 | Subject | Re: i686 quirk for AMD Geode | From | (Lennart Sorensen) |
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On Tue, Nov 17, 2009 at 08:43:45AM -0800, H. Peter Anvin wrote: > On 11/17/2009 06:34 AM, Lennart Sorensen wrote: > > On Tue, Nov 17, 2009 at 11:59:29AM +0000, Alan Cox wrote: > >>> Trying rdmsr from msr-tools 1.2 gives me: > >>> > >>> # ./rdmsr -x 0x00001810 > >>> rdmsr: CPU 0 cannot read MSR 0x00001810 > >>> > >>> Hmm, now what? > >> > >> Beats me - I thought the region registers were read/write. > > > > Actually it seems I can't read any MSRs on it. > > > > Using the same kernel, same msr module, same rdmsr on a Geode LX system > > works fine. I can read MSRs no problem. Seems the msr module isn't > > working on the Geode SC1200 (and hence possibly the GX1). > > > > That would seem highly unlikely ... unless the MSR flag isn't exposed in > CPUID.
That would be odd yes.
# cat /proc/cpuinfo processor : 0 vendor_id : CyrixInstead cpu family : 5 model : 9 model name : Geode(TM) Integrated Processor by National Semi stepping : 1 cpu MHz : 266.612 cache size : 16 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu tsc msr cx8 cmov mmx cxmmx bogomips : 534.41 clflush size : 32 power management:
That part looks OK. So why is reading MSRs not working on this stupid CPU at any of the addresses the data book says should work.
-- Len Sorensen
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