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LM(4) Device Drivers Manual LM(4)

lmNational Semiconductor LM78, LM79 and compatible hardware monitors

lm0 at isa? port 0x280 flags 0x00
lm1 at isa? port 0x290 flags 0x00
lm2 at isa? port 0x310 flags 0x00
lm3 at isa? port 0xa00 flags 0x00
lm0 at pnpbios0 index ? flags 0x00
lm0 at iic? addr 0x2e flags 0x00
lm* at wbsio?

The lm driver provides support for the National Semiconductor LM series hardware monitors and register compatible chips to be used with the envsys(4) API.

The original LM78 hardware monitor supports 11 sensors:

uV DC Core voltage
uV DC unknown
uV DC +3.3V
uV DC +5V
uV DC +12V
uV DC -12V
uV DC -5V
uK Motherboard Temperature
RPM Fan
RPM Chassis Fan
RPM Fan
For other devices, sensors' names and numbers will be different.

Due to hardware limitations, fresh sensor data is only available every 2 seconds.

Chips supported by the lm driver include:

For most of the Winbond chips (identified with a * above), the flags configuration option can be specified to select the type of temperature sensor:

Sensor Type
Thermistor diode (Power-On default)
Pentium-II diode
2N3904 Bipolar
Thermistor diode

envsys(4), wbsio(4), envstat(8)

The lm device appeared in NetBSD 1.5.

Some vendors connect these chips to non-standard thermal diodes and resistors. This will result in bogus sensor values.

Interrupt support is unimplemented.

There are currently no known pnpbios IDs assigned to LM chips.

March 8, 2018 NetBSD-9.2