diff --git a/arch/arm/cpu/armv7/am33xx/clock_am43xx.c b/arch/arm/cpu/armv7/am33xx/clock_am43xx.c
index 31188c8..529a119 100644
--- a/arch/arm/cpu/armv7/am33xx/clock_am43xx.c
+++ b/arch/arm/cpu/armv7/am33xx/clock_am43xx.c
@@ -118,4 +118,7 @@
 
 	/* Select the Master osc clk as Timer2 clock source */
 	writel(0x1, &cmdpll->clktimer2clk);
+
+	/* For OPP100 the mac clock should be /5. */
+	writel(0x4, &cmdpll->clkselmacclk);
 }
diff --git a/arch/arm/include/asm/arch-am33xx/cpu.h b/arch/arm/include/asm/arch-am33xx/cpu.h
index b94b56c..523d22e 100644
--- a/arch/arm/include/asm/arch-am33xx/cpu.h
+++ b/arch/arm/include/asm/arch-am33xx/cpu.h
@@ -400,6 +400,8 @@
 struct cm_dpll {
 	unsigned int resv1;
 	unsigned int clktimer2clk;	/* offset 0x04 */
+	unsigned int resv2[11];
+	unsigned int clkselmacclk;	/* offset 0x34 */ 
 };
 #endif /* CONFIG_AM43XX */