how to migrate these drivers?

[Pau]

I want to fix these drivers so that they compile in 2.5. Is anybody 
working on it? Any rule of the thumb to do it?

Thanks

depmod: *** Unresolved symbols in 
/var/tmp/kernel-2.5.6pre1-root/lib/modules/2.5.6-pre1/kernel/drivers/media/video/bttv.o
depmod: 	virt_to_bus_not_defined_use_pci_map
depmod: *** Unresolved symbols in 
/var/tmp/kernel-2.5.6pre1-root/lib/modules/2.5.6-pre1/kernel/drivers/net/pcmcia/xircom_tulip_cb.o
depmod: 	bus_to_virt_not_defined_use_pci_map
depmod: 	virt_to_bus_not_defined_use_pci_map
depmod: *** Unresolved symbols in 
/var/tmp/kernel-2.5.6pre1-root/lib/modules/2.5.6-pre1/kernel/net/irda/irda.o
depmod: 	virt_to_bus_not_defined_use_pci_map
depmod: *** Unresolved symbols in 
/var/tmp/kernel-2.5.6pre1-root/lib/modules/2.5.6-pre1/kernel/sound/oss/maestro.o
depmod: 	virt_to_bus_not_defined_use_pci_map
depmod: *** Unresolved symbols in 
/var/tmp/kernel-2.5.6pre1-root/lib/modules/2.5.6-pre1/kernel/sound/oss/sound.o
depmod: 	virt_to_bus_not_defined_use_pci_map
make[1]: *** [_modinst_post] Error 1

Pau