em4k —
ELBOX Mediator 4000 PCI bridge driver
em4k0 at zbus0
emmem0 at zbus0
pci* at empb0
options PCI_NETBSD_CONFIGURE
The em4k driver provides support for the PCI bus present
  on Mediator 4000 bridge and associated PCI/Zorro daughterboards.
The em4k driver supports the following hardware:
  - ELBOX Mediator PCI 4000D
-  
- ELBOX Mediator PCI 4000Di
-  
- ELBOX Mediator PCI 4000T
-  
- ELBOX Mediator PCI 3000D
-  
- ELBOX Mediator PCI 3000T
-  
 
MK-II editions are also supported.
The em4k device first appeared in
  NetBSD 7.0.
The em4k driver was written by Radoslaw
  Kujawa
  <radoslaw.kujawa@gmail.com>.
  It was developed using information obtained through reverse engineering by
  Frank Wille and Radoslaw
  Kujawa. The authors have no access to official documentation (which is
  only available under NDA).
DMA to host memory is not supported. It is unclear if the hardware supports DMA
  to host memory at all. It is possible to implement DMA through bounce buffers
  in graphics card memory, but this needs further research.