Hi all, I found a bug in msrtool. On AMD Geode GX2 the reading of MSR registers above 0x7FFFFFFF gives an error. For MSR register 0x80000000 the error is: linux_rdmsr: read(0x80000000): Invalid argument I spend about 8 hours to look at the code but it needs a more expirienced programmer. The bug tracking system does not seem to know msrtool. Thanks, Nils.