Hi,
most probably and according to Google search like
http://orange.kame.net/dev/cvsweb.cgi/kame/netbsd/sys/dev/ic/adwlib.h?rev=1.1(serach for "warn_code" in the page) it stands for
/* PCI config space set error */
...which can pretty much mean everything related to PnP I'm afraid. Like wrong IRQ, shared IRQ, whatever.
Try plugging the SCSI controller card into a different PCI slot (if possible) in that case.
Perhaps it also means
/* set SCSI ID failed */
...which in turn can be related to wrong/duplicate SCSI-adressing of a device. Perhaps also a mis-configuration of SCSI BIOS options (if the controller has a configurable BIOS).
Hope this helps (although not sure as the above is drawn from Linux driver code and heavily "interpreted"...)
Thomas