[src/trunk]: src/share/man/man4 Document the 0x02 flag.

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

details:   https://anonhg.NetBSD.org/src/rev/c22492ccb149
branches:  trunk
changeset: 516324:c22492ccb149
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Sun Oct 21 18:57:39 2001 +0000

description:
Document the 0x02 flag.

diffstat:

 share/man/man4/pciide.4 |  8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diffs (22 lines):

diff -r 1d5b2037ec15 -r c22492ccb149 share/man/man4/pciide.4
--- a/share/man/man4/pciide.4   Sun Oct 21 18:55:14 2001 +0000
+++ b/share/man/man4/pciide.4   Sun Oct 21 18:57:39 2001 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: pciide.4,v 1.33 2001/09/22 15:58:13 wiz Exp $
+.\"    $NetBSD: pciide.4,v 1.34 2001/10/21 18:57:39 thorpej Exp $
 .\"
 .\" Copyright (c) 1998 Manuel Bouyer.
 .\"
@@ -86,6 +86,12 @@
 driver to use DMA when there is no explicit DMA mode setting support for
 the controller but DMA is present. If the BIOS didn't set up the controller
 properly, this can cause a machine hang.
+.Pp
+The 0x0002 flag forces the
+.Nm
+driver to disable DMA on chipsets for which DMA would normally be
+enabled.  This can be used as a debugging aid, or to work around
+problems where the IDE controller is wired up to the system incorrectly.
 .Sh SEE ALSO
 .Xr intro 4 ,
 .Xr pci 4 ,