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From: Warner Losh <imp@FreeBSD.org>
Date: Tue, 31 Mar 2009 19:23:59 +0000 (UTC)
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Subject: svn commit: r190598 - head/sys/dev/ed
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Author: imp
Date: Tue Mar 31 19:23:59 2009
New Revision: 190598
URL: http://svn.freebsd.org/changeset/base/190598

Log:
  Add additional data on the MIIBUS WTF that I committed earlier.

Modified:
  head/sys/dev/ed/if_ed_pccard.c

Modified: head/sys/dev/ed/if_ed_pccard.c
==============================================================================
--- head/sys/dev/ed/if_ed_pccard.c	Tue Mar 31 19:20:03 2009	(r190597)
+++ head/sys/dev/ed/if_ed_pccard.c	Tue Mar 31 19:23:59 2009	(r190598)
@@ -1098,6 +1098,10 @@ ed_miibus_readreg(device_t dev, int phy,
 	 * Also, PHYs above 16 appear to be phantoms on some cards, but not
 	 * others.  Registers read for this are often the same as prior values
 	 * read.  Filter all register requests to 17-31.
+	 *
+	 * I can't explain it, since I don't have the DL100xx data sheets, but
+	 * the DL100xx chips do 13-bits before the 'ACK' but, but the AX88x90
+	 * chips have 14.  The linux pcnet and axnet drivers confirm this.
 	 */
 	if (sc->chip_type == ED_CHIP_TYPE_AX88790) {
 		if (phy > 0x10)