kern/53410: AMD Phenom II shows zero amdtemp0

[Hauke Fath <hf%spg.tu-darmstadt.de@localhost>]

>Number:         53410
>Category:       kern
>Synopsis:       AMD Phenom II shows zero amdtemp0
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jun 28 15:00:00 +0000 2018
>Originator:     Hauke Fath
>Release:        NetBSD 8.0_RC1
>Organization:
Technische Universitaet Darmstadt
>Environment:
	
	
System: NetBSD Gstoder 8.0_RC1 NetBSD 8.0_RC1 (GA-MA770-UD3-$Revision$) #0: Mon Jun 18 17:00:10 CEST 2018 hf@Hochstuhl:/var/obj/netbsd-builds/8/amd64/sys/arch/amd64/compile/GA-MA770-UD3 amd64
Architecture: x86_64
Machine: amd64
>Description:

	On an AMD Phenom II machine (board is GA-MA770-UD3)

cpu0 at mainbus0 apid 0
cpu0: AMD Phenom(tm) II X4 B50 Processor, id 0x100f42
cpu0: package 0, core 0, smt 0
cpu1 at mainbus0 apid 1
cpu1: AMD Phenom(tm) II X4 B50 Processor, id 0x100f42
cpu1: package 0, core 1, smt 0
cpu2 at mainbus0 apid 2
cpu2: AMD Phenom(tm) II X4 B50 Processor, id 0x100f42
cpu2: package 0, core 3, smt 0
cpu3 at mainbus0 apid 3
cpu3: AMD Phenom(tm) II X4 B50 Processor, id 0x100f42
cpu3: package 0, core 2, smt 0

	the amdtemp(4) sensor attached as

amdnb_misc0 at pci0 dev 24 function 3: AMD NB Misc Configuration
amdtemp0 at amdnb_misc0: AMD CPU Temperature Sensors (Family10h)

	shows a constant zero

% envstat -d amdtemp0
                    Current  CritMax  WarnMax  WarnMin  CritMin  Unit
cpu0 temperature:     0.000                                      degC
% 

	
>How-To-Repeat:

	Find your AMD Phenom II equipped machine powers off as
	overheated. While the bios confirms 80 °C, NetBSD sensor
	readings are less than helpful.

	(Nor are the board's itesio0 readings:

[itesio0]
          CPU Temp:    42.000                                      degC
       System Temp:    49.000                                      degC
          Aux Temp:    80.000                                      degC

       [...] )

	
>Fix:
	Yes, please.

	

>Unformatted: