From ba93cc69d27b8038934a624c4dfa3bff254628da Mon Sep 17 00:00:00 2001 From: Jeremy Evans Date: Mon, 8 Jan 2001 23:45:13 +0000 Subject: From chris@: Update man page with slightly more useful information --- share/man/man4/pciide.4 | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/share/man/man4/pciide.4 b/share/man/man4/pciide.4 index 9b8e226c7ef..4ddc2f4d959 100644 --- a/share/man/man4/pciide.4 +++ b/share/man/man4/pciide.4 @@ -1,4 +1,4 @@ -.\" $OpenBSD: pciide.4,v 1.11 2000/12/21 21:01:18 aaron Exp $ +.\" $OpenBSD: pciide.4,v 1.12 2001/01/08 23:45:12 jeremy Exp $ .\" $NetBSD: pciide.4,v 1.8 1999/03/16 01:19:17 garbled Exp $ .\" .\" Copyright (c) 1998 Manuel Bouyer. @@ -97,9 +97,17 @@ This will be a problem only if the controller has been disabled in the BIOS and another controller has been installed which uses the ISA legacy I/O ports and interrupts. .Pp -Although this driver supports several UltraDMA/100 controllers, at this time -it only uses them in UltraDMA/66 modes. +For proper operation of UltraDMA 3 (44 MB/sec), 4 (66 MB/sec), or 5 (100 MB/sec), +a 40-pin, 80-conductor cable must be used. On some controllers, the pciide +driver can probe the chip and see if it detects that an 80-conductor or 40- +conductor cable was used. If not, it will down-grade to UltraDMA 2 mode. +On other controllers, no such capability exists, and the driver assumes +you are using an 80-conductor cable. If you are getting errors about +corrupted data, check to make sure you are using the correct cable. +An 80-conductor cable is recommended for any IDE installation, not just +ones using faster UltraDMA modes, because it will decrease electrical +noise and increase data reliability. .Pp The timings used for the PIO and DMA modes for controllers listed above -are for a PCI bus running at 30 or 33 Mhz. -This driver may not work properly on overclocked systems. +are for a PCI bus running at 30 or 33 Mhz. These timings will work on a slower +bus, but they may cause errors on an over-clocked bus. -- cgit v1.2.3