diff --git a/board/freescale/b4860qds/b4_pbi.cfg b/board/freescale/b4860qds/b4_pbi.cfg
index 57b726eead82de1794091602445a068e8f8d51bf..05377bac5bb248fd6706cbec1ec91f31720053e0 100644
--- a/board/freescale/b4860qds/b4_pbi.cfg
+++ b/board/freescale/b4860qds/b4_pbi.cfg
@@ -22,6 +22,9 @@
 09110024 00100008
 09110028 00100008
 0911002c 00100008
+#slowing down the MDC clock to make it <= 2.5 MHZ
+094fc030 00008148
+094fd030 00008148
 #Flush PBL data
 09138000 00000000
 091380c0 00000000