PowerMac G5 Quad - fan control?

[Torfinn Ingolfsen]

Hello,

I just tried booting the hard drive from my old G5 on the new one, which is a PowerMac G5 Quad[1], according to specs.
tingo at kg-g5$ uname -a
FreeBSD kg-g5.kg4.no 9.0-CURRENT FreeBSD 9.0-CURRENT #119 r217462M: Sat Jan 15 16:
@comporellon.tachypleus.net:/usr/obj/powerpc.powerpc/usr/src/sys/GENERIC  powerpc

However, this model doesn't seem to have the necessary hardware for the fcu driver:
root at kg-g5# sysctl dev.fcu
sysctl: unknown oid 'dev.fcu'

It does have something called Apple SMU:
root at kg-g5# sysctl dev.smu
dev.smu.0.%desc: Apple System Management Unit
dev.smu.0.%driver: smu
dev.smu.0.%pnpinfo: name=smu compat=smu
dev.smu.0.%parent: nexus0
dev.smu.0.fans.drive_bay_a_intake.minrpm: 1000
dev.smu.0.fans.drive_bay_a_intake.maxrpm: 4000
dev.smu.0.fans.drive_bay_a_intake.rpm: 4001
dev.smu.0.fans.backside.minrpm: 1100
dev.smu.0.fans.backside.maxrpm: 3000
dev.smu.0.fans.backside.rpm: 3000
dev.smu.0.fans.cpu_a_intake.minrpm: 485
dev.smu.0.fans.cpu_a_intake.maxrpm: 3200
dev.smu.0.fans.cpu_a_intake.rpm: 3192
dev.smu.0.fans.cpu_b_intake.minrpm: 485
dev.smu.0.fans.cpu_b_intake.maxrpm: 3200
dev.smu.0.fans.cpu_b_intake.rpm: 3197
dev.smu.0.fans.cpu_a_exhaust.minrpm: 500
dev.smu.0.fans.cpu_a_exhaust.maxrpm: 3200
dev.smu.0.fans.cpu_a_exhaust.rpm: 3201
dev.smu.0.fans.cpu_b_exhaust.minrpm: 500
dev.smu.0.fans.cpu_b_exhaust.maxrpm: 3200
dev.smu.0.fans.cpu_b_exhaust.rpm: 3199
dev.smu.0.fans.cpu_a_pump.minrpm: 1250
dev.smu.0.fans.cpu_a_pump.maxrpm: 3600
dev.smu.0.fans.cpu_a_pump.rpm: 3594
dev.smu.0.fans.cpu_b_pump.minrpm: 1250
dev.smu.0.fans.cpu_b_pump.maxrpm: 3600
dev.smu.0.fans.cpu_b_pump.rpm: 3637
dev.smu.0.fans.expansion_slots_intake.minrpm: 1560
dev.smu.0.fans.expansion_slots_intake.maxrpm: 4500
dev.smu.0.fans.expansion_slots_intake.rpm: 4505
dev.smu.0.sensors.slots_power: 17216
dev.smu.0.target_temp: 55
dev.smu.0.critical_temp: 90
dev.smu.0.server_mode: 1

But just reading that doesn't quiet the fans.
How do I control the fans on this PowerMac G5 model?

More info about my experiments on the FreeBSD page for this machine:
http://sites.google.com/site/tingox/powermac_g5_quad_freebsd

References:
1) https://sites.google.com/site/tingox/powermac_g5_quad
-- 
Torfinn