.\"	$NetBSD: envctrl.4,v 1.7 2026/07/25 20:17:39 uwe Exp $
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.Dd July 24, 2026
.Dt ENVCTRL 4 sparc64
.Os
.Sh NAME
.Nm envctrl
.Nd
.Tn Sun
Ultra Enterprise 250 and 450 environmental monitoring
.Sh SYNOPSIS
.Cd "envctrl* at ebus?"
.Sh DESCRIPTION
The
.Nm
driver provides thermal monitoring of processors and power supplies,
as well as automatic fan regulation.
The driver attaches to the
.Ql SUNW,envctrl
subsystem found on Ultra Enterprise 450 systems, and to the
.Ql SUNW,envctrltwo
subsystem found on Ultra Enterprise 250 systems.
.Pp
On Enterprise 450 systems, the following sensors can be queried with
.Xr envstat 8 :
.Bl -column -offset indent ".Li cpufan voltage" "count"
.It Sy "Sensor" Ta Sy "Units" Ta Sy "Description"
.It Li "CPU0" Ta "degC" Ta "Processor 0 temperature"
.It Li "CPU1" Ta "degC" Ta "Processor 1 temperature"
.It Li "CPU2" Ta "degC" Ta "Processor 2 temperature"
.It Li "CPU3" Ta "degC" Ta "Processor 3 temperature"
.It Li "PS0" Ta "degC" Ta "Power supply 0 temperature"
.It Li "PS1" Ta "degC" Ta "Power supply 1 temperature"
.It Li "PS2" Ta "degC" Ta "Power supply 2 temperature"
.It Li "ambient" Ta "degC" Ta "Ambient temperature"
.It Li "cpufan voltage" Ta "V" Ta "Voltage used to drive processor fans"
.It Li "psfan voltage" Ta "V" Ta "Voltage used to drive power supply fans"
.It Li "ps failed" Ta "count" Ta "Number of failed power supplies"
.It Li "fans failed" Ta "count" Ta "Number of failed fans"
.El
.Pp
whilst the following sensors can be queried on Enterprise 250 systems:
.Bl -column -offset indent ".Li cpufan voltage" "count"
.It Sy "Sensor" Ta Sy "Units" Ta Sy "Description"
.It Li "PDB" Ta "degC" Ta "Power distribution board temperature"
.It Li "SCSI" Ta "degC" Ta "SCSI temperature"
.It Li "CPUFAN" Ta "V" Ta "CPU relative fan speed"
.It Li "CPU0" Ta "degC" Ta "Processor 0 temperature"
.It Li "CPU1" Ta "degC" Ta "Processor 1 temperature"
.It Li "MB0" Ta "degC" Ta "Motherboard temperature 0"
.It Li "MB1" Ta "degC" Ta "Motherboard temperature 1"
.El
.Sh SEE ALSO
.Xr envsys 4 ,
.Xr envstat 8
.Sh BUGS
Environmental interrupts are not supported.