NAME
empb —
ELBOX Mediator 1200 PCI bridge
driver
SYNOPSIS
empb0 at zbus0
emmem0 at zbus0
empm0 at zbus0
pci* at empb0
options PCI_NETBSD_CONFIGURE
DESCRIPTION
The
empb driver provides support for the PCI bus present on
Mediator 1200 bridge for Amiga 1200.
HARDWARE
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
-
DIAGNOSTICS
- 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.
SEE ALSO
amiga/em4k(4),
amiga/mppb(4),
amiga/p5pb(4),
pci(4)
HISTORY
The
empb device first appeared in
NetBSD
7.0.
AUTHORS
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).
CAVEATS
Mediator ZIV might work but is untested.
BUGS
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.