port-i386: "bus-master DMA support present, but unused (couldn't map registers)"

Subject: "bus-master DMA support present, but unused (couldn't map registers)"
To: None <port-i386@netbsd.org>
From: Henry Nelson <henry@irm.nara.kindai.ac.jp>
List: port-i386
Date: 07/17/2001 17:12:37

dmesg shows:
pciide0 at pci0 dev20 function0: OPTi 82c621 PCI IDE controller (rev. 0x11)
pciide0: bus-master DMA support present, but unused (couldn't map registers)

This is NetBSD 1.5.1 on an IBM PC750 Type 6883-JOP.  Is there some setting
when building a custom kernel that would resolve this problem, or is this
some hardware issue?  TIA

henry nelson