IPMI or LANPLUS may give you pre-OS or OS-independent hardware
management and control via the 450's "LOM" card.

Just guessing though.  But i use IPMI on Dell PowerEdge and there's a
lot of reference to Sparc-specific stuff, and I can certainly
monitor/control chassis related features from there.

~lava

On Wed, 2006-01-18 at 07:45, segv@netctl.net wrote:
> Hi, when bootting Sun E450 machine, the cooling fans are working at full speed,
> and they make a lot of noise. As Solaris boots, it switches the fans to a
> regular speed, substantially decreasing the noise. Can NetBSD do the same
> thing? I booted NetBSD-3.0 from CD-ROM, but the fans were still working at full
> speed. Is there a utility or OpenBoot setting to regulate their speed?