From 8a67408c5f9bda4845be219feec4e9d6c844a038 Mon Sep 17 00:00:00 2001 From: mickey Date: Mon, 17 Apr 2000 21:35:18 +0000 Subject: [PATCH] pchb, and a few notes on what it does; aaron@ was picking --- share/man/man4/pchb.4 | 57 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 share/man/man4/pchb.4 diff --git a/share/man/man4/pchb.4 b/share/man/man4/pchb.4 new file mode 100644 index 00000000000..0a1445b6fe3 --- /dev/null +++ b/share/man/man4/pchb.4 @@ -0,0 +1,57 @@ +.\" $OpenBSD: pchb.4,v 1.1 2000/04/17 21:35:18 mickey Exp $ +.\" +.\" Copyright (c) 2000 Michael Shalayeff. All rights reserved. +.\" +.Dd April 12, 2000 +.Dt PCHB 4 +.Os +.Sh NAME +.Nm pchb +.Nd PCI-Host Bridge +.Sh SYNOPSIS +.Cd "pchb* at pci? dev ? function?" +.Cd "pci* at pchb? +.Sh DESCRIPTION +The +.Nm +driver provides support for PCI-Host adapter-specific functions for +the following devices: +.Pp +.Bl -tag -width -offset indent -compact +.It 450 PCIset (Orion) +Supports secondary PCI bus. +.It 82424ZX (Saturn) +Disables CPU-PCI write posting. +.It i82810/810E +Supports the random numbers generator, +supplying random bytes from the system's thermal noise. +Driven by periodic checks for available data from the generator, +it supplies entropy to the +.Xr random 4 +driver for common usage. +.El +.Pp +On i386 systems all other PCI devices of class +.Nm Bridge +and sub-class +.Nm Bridge Host +are supported just as PCI attachment point. +.Pp +The Power-PC port supports several Apple and Motorola brdges. +.Pp +.Sh SEE LASO +.Xr intro 4 , +.Xr pci 4 , +.Xr random 4 +.Sh HISTORY +Random number generator support first appeared in +.Ox 2.7 . +.Sh AUTHORS +The original version of the driver was ported from +.Nx . +Support for true RNG present on i82810 chips was added by +Michael Shalayeff . +.Sh BUGS +Real RNG probe should fix the PCI scanning loop so it would find the Firmware +Hub (i82802) which actually contains the RNG device and +probe it as a real PCI device (i.e., common PCI registers are there). -- 2.20.1