[src/trunk]: src/sys/dev/ic add comment to clearify hw nature

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

details:   https://anonhg.NetBSD.org/src/rev/e37b993d9ff5
branches:  trunk
changeset: 1008685:e37b993d9ff5
user:      nisimura <nisimura%NetBSD.org@localhost>
date:      Tue Mar 31 02:47:34 2020 +0000

description:
add comment to clearify hw nature

diffstat:

 sys/dev/ic/dm9000.c |  8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diffs (31 lines):

diff -r 851c58573bd5 -r e37b993d9ff5 sys/dev/ic/dm9000.c
--- a/sys/dev/ic/dm9000.c       Tue Mar 31 02:32:25 2020 +0000
+++ b/sys/dev/ic/dm9000.c       Tue Mar 31 02:47:34 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: dm9000.c,v 1.24 2020/03/31 02:32:25 nisimura Exp $     */
+/*     $NetBSD: dm9000.c,v 1.25 2020/03/31 02:47:34 nisimura Exp $     */
 
 /*
  * Copyright (c) 2009 Paul Fleischer
@@ -253,10 +253,11 @@
        mii->mii_writereg = mii_writereg;
        mii->mii_statchg = mii_statchg;
 
+       /* assume davicom PHY at 1. ext PHY could be hooked but only at 0-3 */
        sc->sc_ethercom.ec_mii = mii;
        ifmedia_init(ifm, 0, ether_mediachange, ether_mediastatus);
-       mii_attach(sc->sc_dev, mii, 0xffffffff,
-               1 /* PHY 1 */, MII_OFFSET_ANY, 0);
+       mii_attach(sc->sc_dev, mii, 0xffffffff, 1 /* PHY 1 */,
+               MII_OFFSET_ANY, 0);
        if (LIST_FIRST(&mii->mii_phys) == NULL) {
                ifmedia_add(ifm, IFM_ETHER | IFM_NONE, 0, NULL);
                ifmedia_set(ifm, IFM_ETHER | IFM_NONE);
@@ -289,6 +290,7 @@
        io_mode = (dme_read(sc, DM9000_ISR) &
            DM9000_IOMODE_MASK) >> DM9000_IOMODE_SHIFT;
 
+       /* frame body read/write ops in 2 byte quantity or byte-wise. */
        DPRINTF(("DM9000 Operation Mode: "));
        switch (io_mode) {
        case DM9000_MODE_8BIT: