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Document the 0x02 flag.

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thorpej 2001-10-21 18:57:39 +00:00
parent 5f6fd54ec7
commit 322df02b17
1 changed files with 7 additions and 1 deletions
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8
share/man/man4/pciide.4
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@ -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 @@ The 0x0001 flag forces the
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 ,