This article is from a FAQ concerning SCO operating
systems. While some of the information may be applicable to any OS,
or any Unix or Linux OS, it may be specific to SCO Xenix, Open
There is lots of Linux, Mac OS X and general Unix info elsewhere on
this site: Search this site is the best
way to find anything.
An "interrupt is private" message means that you have an
interrupt conflict on something critical- usually your controller.
If this isn't a new install, it's probably because you removed some
device and that caused the BIOS to reassign the interupts, creating
a conflict. The solution is to go into the BIOS and tell it NOT to
use that interrupt for Plug and Play/PCI devices. Hopefully that
will get you back to where you were.
Interrupt changes on PCI machines can happen for reasons as
simple as accidentally unplugging the mouse. What happens is this:
the mouse uses interrupt 12, so when it is present, 12 will not be
assigned to any other device. If the mouse gets unplugged and you
reboot, 12 is now available and will get assigned, which throws off
everything else, and therefore can kill nic cards and disk
controllers that the system was expecting to be at a different
The "no root controller" message can come from that, but if you
are getting that on an INSTALL, it usually means that you need a
BTLD (Boot Time Loadable Driver) for your controller.