Watch out for the angry kernel
After approximately 12 hours of trying to compile the thing after tweaking the source very slightly in order to fix a minor inconvenience:
teemu@opensolaris:~$ uname -a
SunOS opensolaris 5.11 on111b-teemu i86pc i386 i86pc Solaris
And now I just hope it actually fixes the original problem and that I won't run into any driver problems...