XFree86-4-Server-snap fails on VIA CLE266 running 5-CURRENT

Sorry for the cross-posting, problem seems to cross these three lists;
remove inappropriate ones on reply if desired.

I've got a VIA EPIA box which has the CastleRock CLE266 video
chipset.  Matt Dillion provided instructions on how to get the port
XFree86-4-Server-snap to run, so I've been able to run its 4.3.99.12
build for a while.

Last night I updated the port, which got XFree86 4.3.99.15.  It works
on my other non-VIA machines, but on the VIA CLE266 box it bombs upon
startup, using the same XFree86Config file I had been using
earlier.  /var/log/XFree86.0.log repeats several times before death:

  Symbol drmOpen from module /usr/X11R6/lib/modules/drivers/via_drv.o is unresolvable
  Symbol drmClose from module /usr/X11R6/lib/modules/drivers/via_drv.o is unresolvable


After some googling I added lines to my XFree86Config:

  Load "vbe"
  Load "int10"
  Load "drm"

This made the "drmOpen/drmClose unresolvable" messages go away, but it
died anyway, with no indication why.

I suspected that DRI/DRM isn't working for me, since VIA isn't one of
the common chipsets that seem to be supported, like here:

  /usr/src/sys/modules/drm:
  -rw-r--r--    1 root  wheel   141 Sep  9  2003 Makefile
  -rw-r--r--    1 root  wheel   110 Nov  6  2002 Makefile.inc
  drwxr-xr-x    2 root  wheel   512 Jan 14 06:04 mga
  drwxr-xr-x    2 root  wheel   512 Jan 14 06:04 r128
  drwxr-xr-x    2 root  wheel   512 Jan 14 06:04 radeon
  drwxr-xr-x    2 root  wheel   512 Jan 14 06:04 sis
  drwxr-xr-x    2 root  wheel   512 Jan 14 06:04 tdfx

I then recomiled the XFree86-4-Server-snap after hacking the Makefile
to get it to *not* use:

  RUN_DEPENDS+=		${X11BASE}/lib/modules/dri/r200_dri.so:${PORTSDIR}/graphics/dri
  BuildXF86DRI=		YES
  PLIST_SUB+=		DRI=""

But again, it died on the VIA on startup, with no message indicating
what failed in the log file.


Am I correct in thinking that the problem is with FreeBSD's DRI/DRM
support of the VIA CLE266 chips? If so, is there a way to tell
XFree86Config to NOT use these features, to disable these options?

If it's something else, any suggestions for a work-around?

If 4.3.99.15 simply won't on my HW, can someone provide the
incantation to cvsup the port from back when it used XFree86-4.3.99.12 ?

Any other suggestions?

Thanks.