.\" $NetBSD: mppb.4,v 1.4 2011/12/05 10:36:39 wiz Exp $
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.\" Copyright (c) 2011 The NetBSD Foundation, Inc.
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Radoslaw Kujawa.
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.Dd December 3, 2011
.Dt MPPB 4 amiga
.Os
.Sh NAME
.Nm mppb
.Nd Prometheus PCI bridge driver
.Sh SYNOPSIS
.Cd "mppb* at zbus0"
.Cd "pci* at mppb?"
.Sh DESCRIPTION
The
.Nm
driver provides support for the PCI bus present on Prometheus Zorro III to PCI
bridge card.
.Sh HARDWARE
The
.Nm
driver supports the following hardware:
.Bl -tag -width "PROMETHEUS" -offset indent
.It Em PROMETHEUS
Matay Prometheus. Manufacturer 44359, product 1.
.El
.Sh DIAGNOSTICS
.Bl -diag
.It Unable to allocate space in parent map.
The kernel has run out of virtual memory space.
.El
.Sh SEE ALSO
.Xr pci 4
.Sh HISTORY
The
.Nm
device first appeared in
.Nx 6.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was written by
.An Radoslaw Kujawa Aq radoslaw.kujawa@gmail.com .
.Sh BUGS
The hardware does not support DMA to host memory.
.Pp
The Prometheus does not support repeating of PCI transations, instead if the
PCI card demands a retry of transaction, it returns value 0xFFFFFFFF.
This is currently not handled by the
.Nm
driver and will confuse some PCI card drivers.
.Pp
The system may run out of kernel virtual memory space if Prometheus is present.
This is due to fact that m68k-specific
.Xr pmap 9
code places User Page Table base address at statically defined address
0x10000000, which does not leave enough kernel space to fit a 512MB board, such
as the Prometheus.
It is possible to work around this problem, by moving User Page Table base
to higher address.