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From: Weongyo Jeong <weongyo@FreeBSD.org>
Date: Mon, 6 Sep 2010 22:23:35 +0000 (UTC)
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Subject: svn commit: r212272 - head/share/man/man4
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Author: weongyo
Date: Mon Sep  6 22:23:35 2010
New Revision: 212272
URL: http://svn.freebsd.org/changeset/base/212272

Log:
  Adds LOADER TUNABLES section to mention knobs which could be controlled
  by loader(8) interface.

Modified:
  head/share/man/man4/bwn.4

Modified: head/share/man/man4/bwn.4
==============================================================================
--- head/share/man/man4/bwn.4	Mon Sep  6 22:10:57 2010	(r212271)
+++ head/share/man/man4/bwn.4	Mon Sep  6 22:23:35 2010	(r212272)
@@ -110,6 +110,20 @@ Join a specific BSS network with 64-bit 
 ifconfig wlan create wlandev bwn0 ssid my_net \e
         wepmode on wepkey 0x1234567890 weptxkey 1 up
 .Ed
+.Sh LOADER TUNABLES
+Tunables can be set at the
+.Xr loader 8
+prompt before booting the kernel or stored in
+.Xr loader.conf 5 .
+.Bl -tag -width indent
+.It Va hw.bwn.msi_disable
+This tunable disables MSI support on the hardware.
+The default value is 0.
+.It Va hw.bwn.usedma
+This tunable enables DMA operations on the hardware.
+If the value is 0, PIO mode would be used.
+The default value is 1.
+.El
 .Sh SEE ALSO
 .Xr arp 4 ,
 .Xr bwi 4 ,