amd64/188877: powernow doesn't attach on AMD G-T40E

[Michael Moll]

>Number:         188877
>Category:       amd64
>Synopsis:       powernow doesn't attach on AMD G-T40E
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-amd64
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Apr 22 07:20:00 UTC 2014
>Closed-Date:
>Last-Modified:
>Originator:     Michael Moll
>Release:        10-STABLE
>Organization:
>Environment:
FreeBSD geode.kvedulv.de 10.0-STABLE FreeBSD 10.0-STABLE #0 r264543M: Thu Apr 17 06:52:25 CEST 2014     mmoll at geode.kvedulv.de:/usr/obj/svn/base/stable/10/sys/GEODE  amd64
>Description:
Running on a PC Engines APU 1C board with the following CPU:

CPU: AMD G-T40E Processor (1000.02-MHz K8-class CPU)
  Origin = "AuthenticAMD"  Id = 0x500f20  Family = 0x14  Model = 0x2  Stepping = 0
  Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT>
  Features2=0x802209<SSE3,MON,SSSE3,CX16,POPCNT>
  AMD Features=0x2e500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM>
  AMD Features2=0x35ff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,IBS,SKINIT,WDT>
  TSC: P-state invariant, performance statistics

The kernel doesn't attach the powernow driver, but according to x86info the CPU would be capable of using it:

PowerNOW! Technology information
Available features:
        Temperature sensing diode present.
        Thermal Trip
        Thermal Monitoring
        Software Thermal Control
        100MHz multiplier control
        Hardware P-state control
        invariant TSC
        Effective Frequency Interface

Pstate-P0:  1000MHz (current)
Pstate-P1:  800MHz

>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: