[src/netbsd-1-4]: src/share/man/man4 Pull up revision 1.24 (requested by bouy...

[he <he%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c708a8e97290
branches:  netbsd-1-4
changeset: 470855:c708a8e97290
user:      he <he%NetBSD.org@localhost>
date:      Mon Aug 14 14:22:04 2000 +0000

description:
Pull up revision 1.24 (requested by bouyer):
  Document PCIIDE_CMD0646U_ENABLEUDMA.

diffstat:

 share/man/man4/pciide.4 |  14 +++++++++++---
 1 files changed, 11 insertions(+), 3 deletions(-)

diffs (39 lines):

diff -r b273456a5e4a -r c708a8e97290 share/man/man4/pciide.4
--- a/share/man/man4/pciide.4   Mon Aug 14 14:19:54 2000 +0000
+++ b/share/man/man4/pciide.4   Mon Aug 14 14:22:04 2000 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: pciide.4,v 1.8.2.3 2000/07/27 17:47:46 he Exp $
+.\"    $NetBSD: pciide.4,v 1.8.2.4 2000/08/14 14:22:04 he Exp $
 .\"
 .\" Copyright (c) 1998 Manuel Bouyer.
 .\"
@@ -39,6 +39,7 @@
 .Cd "pciide* at pci? dev ? function ? flags 0x0000"
 .Cd "options PCIIDE_CMD064x_DISABLE"
 .Cd "options PCIIDE_AMD756_ENABLEDMA"
+.Cd "options PCIIDE_CMD0646U_ENABLEUDMA"
 .Sh DESCRIPTION
 The
 .Nm pciide
@@ -91,12 +92,19 @@
 and another controller has been installed and uses the ISA legacy I/O ports
 and interrupts.
 .Pp
+The PCI0646U controller is known to be buggy with Ultra-DMA transfers, so
+Ultra-DMA is disabled by default for this controller. To enable Ultra-DMA,
+use the PCIIDE_CMD0646U_ENABLEUDMA option. Ultra-DMA can eventually be
+disabled on a per-drive basis with config flags, see
+.Xr wd 4 .
+
+.Pp
 The AMD756 chip revision D2 has a bug affecting DMA (but not Ultra-DMA)
 modes.  The workaround documented by AMD is to not use DMA on any drive which
 does not support Ultra-DMA modes.  This does not appear to be necessary on all
 drives, the PCIIDE_AMD756_ENABLEDMA option can be used to force multiword DMA
-on the buggy revisions.  Multiword DMA eventually be disabled on a per-drive
-basis with config flags, see
+on the buggy revisions.  Multiword DMA can eventually be disabled on a
+per-drive basis with config flags, see
 .Xr wd 4 .
 The bug, if triggered, will cause a total system hang.
 .Pp