EMPB(4) Device Drivers Manual (amiga) EMPB(4)

empb
ELBOX Mediator 1200 PCI bridge driver

empb0 at zbus0
emmem0 at zbus0
empm0 at zbus0
pci* at empb0
options PCI_NETBSD_CONFIGURE

The empb driver provides support for the PCI bus present on Mediator 1200 bridge for Amiga 1200.

The empb driver supports the following hardware:
ELBOX Mediator PCI 1200
 
ELBOX Mediator PCI 1200 LT2
 
ELBOX Mediator PCI 1200 LT4
 
ELBOX Mediator PCI 1200 SX
 
ELBOX Mediator PCI 1200 TX
 

empb: linear space mapping might not work
The PCI card driver is trying map memory space with the BUS_SPACE_MAP_LINEAR flag. Due to the windowed design of Mediator, it is expected to fail miserably if normal memory space access methods (e.g., pointer dereference) are used instead of bus_space(9) methods.
empb%d: couldn't find memory space, check your WINDOW jumper
PCI memory space access is disabled on a hardware level. The empb driver will work anyway, but only PCI I/O space will be accessible. To enable memory space set the WINDOW jumper to 4MB or 8MB.

amiga/em4k(4), amiga/mppb(4), amiga/p5pb(4), pci(4)

The empb device first appeared in NetBSD 7.0.

The empb 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).

Mediator ZIV might work but is untested.

DMA to host memory is not supported. This is a hardware limitation. It is possible to implement DMA through bounce buffers in graphics card memory, but this needs further research.
February 17, 2017 NetBSD 9.4