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Diffstat (limited to 'static/openbsd/man4/pchb.4')
| -rw-r--r-- | static/openbsd/man4/pchb.4 | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/static/openbsd/man4/pchb.4 b/static/openbsd/man4/pchb.4 new file mode 100644 index 00000000..a3c83318 --- /dev/null +++ b/static/openbsd/man4/pchb.4 @@ -0,0 +1,62 @@ +.\" $OpenBSD: pchb.4,v 1.18 2013/07/16 16:05:49 schwarze Exp $ +.\" +.\" Michael Shalayeff, 2000. Public Domain. +.\" +.Dd $Mdocdate: July 16 2013 $ +.Dt PCHB 4 +.Os +.Sh NAME +.Nm pchb +.Nd PCI-Host Bridge +.Sh SYNOPSIS +.Cd "pchb* at pci?" +.Cd "pci* at pchb?" +.Sh DESCRIPTION +The +.Nm +driver provides support for PCI-Host adapter-specific functions. +Support is provided for the following devices: +.Bl -tag -width Ds -offset indent +.It i450 PCIset (Orion) +Supports additional PCI buses. +.It Reliance Computer ROSB4, CNB20HE, CNB20LE +Supports additional PCI buses. +.It i82424ZX (Saturn) +Disables CPU-PCI write posting. +.It i82443BX +Provides workaround for the following errata: +"An incorrect address may be driven on the +DRAM bus, resulting in memory data being +fetched from the wrong location." +.It i82810/810E, i82815/815E, i82820, i82840 +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 amd64 and i386 systems, most PCI devices of class +.Nm Bridge +and sub-class +.Nm Bridge Host +are supported just as PCI attachment points. +A few other system control devices not listed here are supported by +.Nm . +.Pp +The macppc port supports several Apple and Motorola bridges. +.Sh SEE ALSO +.Xr intro 4 , +.Xr pci 4 , +.Xr random 4 +.Sh HISTORY +Random number generator support first appeared in +.Ox 2.7 . +.Sh AUTHORS +Support for true RNG present on i82810 chips was added by +.An Michael Shalayeff Aq Mt mickey@openbsd.org . +.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). |