Document the link0 option, which downloads the microcode to the board.

1 files changed, 19 insertions, 2 deletions

diff --git a/share/man/man4/fxp.4 b/share/man/man4/fxp.4
index c915b77..073f61c 100644
--- a/share/man/man4/fxp.4
+++ b/share/man/man4/fxp.4
@@ -37,8 +37,8 @@
 The
 .Nm
 driver provides support for the EtherExpress Pro/10, Pro/100B, and Pro/100+
-PCI Fast Ethernet adapters based on the Intel i82557 or i82559 ethernet
-chips.
+PCI Fast Ethernet adapters based on the Intel i82557, i82558, i82559 
+or i82550 ethernet chips.
 .Pp
 The
 .Nm
@@ -65,6 +65,20 @@ Set full duplex operation
 Note that 100baseTX media type is only available on the Pro/100B and Pro/100+.
 For further information on configuring this device, see
 .Xr ifconfig 8 .
+.Pp
+The
+.Nm
+driver also supports a special link option:
+.Bl -tag -width link0
+.It Cm link0
+Some chip revisions have loadable microcode which can be used to reduce the
+interrupt load on the host cpu.  Not all boards have support microcode support.
+Setting the 
+.Cm link0
+flag with
+.Xr ifconfig 8
+will load download the microcode to the chip if it is available.
+.El
 .Sh DIAGNOSTICS
 .Bl -diag
 .It "fxp%d: couldn't map memory"
@@ -83,6 +97,9 @@ Create, if it does not yet exist, and add to the file
 .Pa /boot/device.hints
 the line
 .Dq Li hint.fxp.0.prefer_iomap="0" .
+.It "fxp%d: Microcode loaded, int_delay: %d usec  bundle_max: %d"
+The chip has successfully downloaded the microcode, and changed the
+parametrized values to the giveng settings.
 .El
 .Sh SEE ALSO
 .Xr arp 4 ,