Brad reminded me about the importance of commenting on the design of the mlphy(4) which is different from other PHYs.
It's from FreeBSD, no functional change introduced. Index: src/sys/dev/mii/mlphy.c =================================================================== RCS file: /cvs/src/sys/dev/mii/mlphy.c,v retrieving revision 1.1 diff -u -p -r1.1 mlphy.c --- src/sys/dev/mii/mlphy.c 28 Mar 2011 15:21:38 -0000 1.1 +++ src/sys/dev/mii/mlphy.c 10 Oct 2011 04:01:52 -0000 @@ -89,6 +89,18 @@ /* * Micro Linear 6692 PHY + * + * The Micro Linear 6692 is a strange beast, and dealing with it using + * this code framework is tricky. The 6692 is actually a 100Mbps-only + * device, which means that a second PHY is required to support 10Mbps + * modes. However, even though the 6692 does not support 10Mbps modes, + * it can still advertise them when performing autonegotiation. If a + * 10Mbps mode is negotiated, we must program the registers of the + * companion PHY accordingly in addition to programming the registers + * of the 6692. + * + * This device also does not have vendor/device ID registers. + * */ #include <sys/param.h>
