According to the dmesg, I have:
VITec,RasterFLEX-320 at sbus0: SBus slot 0 0x0 SBus level 5 sparc ipl 9
VITec,RasterFLEX-320 is /iommu@f,e0000000/sbus@f,e0001000/VITec,RasterFLEX-32@0,0
Sourced RasterFlex drivers from fido.aalin.co.uk/vault/hw/system/sun/3rdparty/rasterflex/
My Xsun configuration for Openstep is now broken though...
Maybe I should take the opportunity to restart from scratch and set the system up with Solaris 2.6 instead?