--- est.c.ORI	2016-12-27 14:33:56.000000000 +0100
+++ est.c	2018-05-29 07:07:21.219581000 +0200
@@ -1192,6 +1192,8 @@
 	switch (bus) {
 	case 100:
 	case 133:
+	case 166:
+	case 267:
 	case 333:
 		return (1);
 	default:
@@ -1217,12 +1219,16 @@
 	/* Figure out the bus clock. */
 	freq = atomic_load_acq_64(&tsc_freq) / 1000000;
 	id = msr >> 32;
-	bus = freq / (id >> 8);
+	bus = (freq + (id >> 9)) / (id >> 8);
+	if( id & 0x4000 )
+	  bus = 2 * freq / ( (id >> 7 & 0x7e) + 1 );
 	device_printf(dev, "Guessed bus clock (high) of %d MHz\n", bus);
 	if (!bus_speed_ok(bus)) {
 		/* We may be running on the low frequency. */
 		id = msr >> 48;
 		bus = freq / (id >> 8);
+		if( id & 0x4000 )
+		  bus = 2 * freq / ( (id >> 7 & 0x7e) + 1 );
 		device_printf(dev, "Guessed bus clock (low) of %d MHz\n", bus);
 		if (!bus_speed_ok(bus))
 			return (EOPNOTSUPP);
@@ -1230,6 +1236,8 @@
 		/* Calculate high frequency. */
 		id = msr >> 32;
 		freq = ((id >> 8) & 0xff) * bus;
+		if( id & 0x4000 )
+		  freq =( (id >> 7 & 0x7e) + 1 ) * bus / 2;
 	}
 
 	/* Fill out a new freq table containing just the high and low freqs. */
@@ -1246,12 +1254,14 @@
 	fp[0].volts = volts;
 	fp[0].id16 = id;
 	fp[0].power = CPUFREQ_VAL_UNKNOWN;
-	device_printf(dev, "Guessed high setting of %d MHz @ %d Mv\n", freq,
+	device_printf(dev, "Guessed high setting of %d MHz @ %d mV\n", freq,
 	    volts);
 
 	/* Second, the low frequency. */
 	id = msr >> 48;
 	freq = ((id >> 8) & 0xff) * bus;
+	if( id & 0x4000 )
+	  freq =( (id >> 7 & 0x7e) + 1 ) * bus / 2;
 	volts = id & 0xff;
 	if (volts != 0) {
 		volts <<= 4;
@@ -1261,7 +1271,7 @@
 	fp[1].volts = volts;
 	fp[1].id16 = id;
 	fp[1].power = CPUFREQ_VAL_UNKNOWN;
-	device_printf(dev, "Guessed low setting of %d MHz @ %d Mv\n", freq,
+	device_printf(dev, "Guessed low setting of %d MHz @ %d mV\n", freq,
 	    volts);
 
 	/* Table is already terminated due to M_ZERO. */