[src/trunk]: src/sys/dev/pci Modify comment for 82544 Errata 9 "Certain regis...

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

details:   https://anonhg.NetBSD.org/src/rev/9a0d4e7c8a2b
branches:  trunk
changeset: 342498:9a0d4e7c8a2b
user:      msaitoh <msaitoh%NetBSD.org@localhost>
date:      Fri Dec 25 05:45:40 2015 +0000

description:
Modify comment for 82544 Errata 9 "Certain register cannot be written with
particular alignments in PCI-X bus operation".

diffstat:

 sys/dev/pci/if_wm.c |  10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diffs (32 lines):

diff -r 8aab8325a1cf -r 9a0d4e7c8a2b sys/dev/pci/if_wm.c
--- a/sys/dev/pci/if_wm.c       Fri Dec 25 04:50:21 2015 +0000
+++ b/sys/dev/pci/if_wm.c       Fri Dec 25 05:45:40 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_wm.c,v 1.386 2015/12/25 04:50:16 msaitoh Exp $      */
+/*     $NetBSD: if_wm.c,v 1.387 2015/12/25 05:45:40 msaitoh Exp $      */
 
 /*
  * Copyright (c) 2001, 2002, 2003, 2004 Wasabi Systems, Inc.
@@ -83,7 +83,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_wm.c,v 1.386 2015/12/25 04:50:16 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_wm.c,v 1.387 2015/12/25 05:45:40 msaitoh Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_net_mpsafe.h"
@@ -3127,8 +3127,12 @@
                hash = CSR_READ(sc, mta_reg + (reg << 2));
                hash |= 1U << bit;
 
-               /* XXX Hardware bug?? */
                if (sc->sc_type == WM_T_82544 && (reg & 1) != 0) {
+                       /*
+                        * 82544 Errata 9: Certain register cannot be written
+                        * with particular alignments in PCI-X bus operation
+                        * (FCAH, MTA and VFTA).
+                        */
                        bit = CSR_READ(sc, mta_reg + ((reg - 1) << 2));
                        CSR_WRITE(sc, mta_reg + (reg << 2), hash);
                        CSR_WRITE(sc, mta_reg + ((reg - 1) << 2), bit);