Solaris/x86 works. I wouldn't say *well*, but it works.
But what you really want is BSD/OS, which has been around since
1991 when it (then called BSD/386) derived from 4.3BSD Net/2 (which,
of course, is where FreeBSD--then 386BSD--and NetBSD also started),
which goes straight on back to the original Berkeley 1BSD from in
1977, and from there to First Edition way back in 1969. It's got
the same Linux binary compatibility that NetBSD and FreeBSD do.
And your boss will just *love* the marketing speak at:
http://www.windriver.com/products/bsd_os/index.html
And of course you can leak money for software support:
http://www.windriver.com/support/index.html
I'll bet you can even buy an IA32 system pre-configured with BSD/OS
from WindRiver if you're going to be throwing money at them
anyway...
The current version number (4.3) is a bit confusing. That's the
release version of BSD/OS; it's got nothing to do with the old BSD
version numbers. BSD/OS is an evolved 4.4BSD Lite (like NetBSD,
FreeBSD, and OpenBSD).