Celoxica RC1000: problems accessing fpga control registers

hi,

i'm writing a linux device driver for the celoxica rc1000 board. Seems that i can't write to any of the fpga control registers on BAR3 (of PCI9080 config space). Reading access seems to be alright because the returned values match those mentioned in the hardware reference manual (in state after power-up).

Reading AND writing to the plx-control-registers (BAR0) and to FPGA RAM (BAR2) is also no problem.

Any suggestions?

thanks, Andrej