From 152b4a4f565c1aa8e8a07f9b365c4fe9ec98d24d Mon Sep 17 00:00:00 2001
From: Brad Smith <brad@cvs.openbsd.org>
Date: Wed, 20 Jul 2005 23:02:42 +0000
Subject: add a comment explaining why we set the MAC address as we do.

From FreeBSD
---
 sys/dev/ic/rtl81x9.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'sys/dev')

diff --git a/sys/dev/ic/rtl81x9.c b/sys/dev/ic/rtl81x9.c
index 8c13f0285d1..7a61d069837 100644
--- a/sys/dev/ic/rtl81x9.c
+++ b/sys/dev/ic/rtl81x9.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: rtl81x9.c,v 1.43 2005/07/20 22:59:52 brad Exp $ */
+/*	$OpenBSD: rtl81x9.c,v 1.44 2005/07/20 23:02:41 brad Exp $ */
 
 /*
  * Copyright (c) 1997, 1998
@@ -971,7 +971,11 @@ void rl_init(xsc)
 	 */
 	rl_stop(sc);
 
-	/* Init our MAC address */
+	/*
+	 * Init our MAC address.  Even though the chipset
+	 * documentation doesn't mention it, we need to enter "Config
+	 * register write enable" mode to modify the ID registers.
+	 */
 	CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_WRITECFG);
 	CSR_WRITE_4(sc, RL_IDR0, *(u_int32_t *)(&sc->sc_arpcom.ac_enaddr[0]));
 	CSR_WRITE_4(sc, RL_IDR4, *(u_int32_t *)(&sc->sc_arpcom.ac_enaddr[4]));
-- 
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