diff --git a/arch/arm/include/asm/arch-am33xx/cpu.h b/arch/arm/include/asm/arch-am33xx/cpu.h
index 10b56e0..f77ac1e 100644
--- a/arch/arm/include/asm/arch-am33xx/cpu.h
+++ b/arch/arm/include/asm/arch-am33xx/cpu.h
@@ -486,6 +486,25 @@ struct ctrl_dev {
 	unsigned int resv4[4];
 	unsigned int miisel;		/* offset 0x50 */
 };
+
+/* gmii_sel register defines */
+#define GMII1_SEL_MII		0x0
+#define GMII1_SEL_RMII		0x1
+#define GMII1_SEL_RGMII		0x2
+#define GMII2_SEL_MII		0x0
+#define GMII2_SEL_RMII		0x4
+#define GMII2_SEL_RGMII		0x8
+#define RGMII1_IDMODE		BIT(4)
+#define RGMII2_IDMODE		BIT(5)
+#define RMII1_IO_CLK_EN		BIT(6)
+#define RMII2_IO_CLK_EN		BIT(7)
+
+#define MII_MODE_ENABLE		(GMII1_SEL_MII | GMII2_SEL_MII)
+#define RMII_MODE_ENABLE        (GMII1_SEL_RMII | GMII2_SEL_RMII)
+#define RGMII_MODE_ENABLE	(GMII1_SEL_RGMII | GMII2_SEL_RGMII)
+#define RGMII_INT_DELAY		(RGMII1_IDMODE | RGMII2_IDMODE)
+#define RMII_CHIPCKL_ENABLE     (RMII1_IO_CLK_EN | RMII2_IO_CLK_EN)
+
 #endif /* __ASSEMBLY__ */
 #endif /* __KERNEL_STRICT_NAMES */
 
diff --git a/board/isee/igep0033/board.c b/board/isee/igep0033/board.c
index a24c22b..9e91f68 100644
--- a/board/isee/igep0033/board.c
+++ b/board/isee/igep0033/board.c
@@ -27,9 +27,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-/* MII mode defines */
-#define RMII_MODE_ENABLE	0x4D
-
 static struct ctrl_dev *cdev = (struct ctrl_dev *)CTRL_DEVICE_BASE;
 
 #ifdef CONFIG_SPL_BUILD
@@ -158,7 +155,8 @@ int board_eth_init(bd_t *bis)
 			eth_setenv_enetaddr("ethaddr", mac_addr);
 	}
 
-	writel(RMII_MODE_ENABLE, &cdev->miisel);
+	writel((GMII1_SEL_RMII | RMII1_IO_CLK_EN),
+	       &cdev->miisel);
 
 	rv = cpsw_register(&cpsw_data);
 	if (rv < 0)
diff --git a/board/phytec/pcm051/board.c b/board/phytec/pcm051/board.c
index f53c5bb..e40b0bd 100644
--- a/board/phytec/pcm051/board.c
+++ b/board/phytec/pcm051/board.c
@@ -31,8 +31,6 @@
 DECLARE_GLOBAL_DATA_PTR;
 
 /* MII mode defines */
-#define MII_MODE_ENABLE		0x0
-#define RGMII_MODE_ENABLE	0xA
 #define RMII_RGMII2_MODE_ENABLE	0x49
 
 static struct ctrl_dev *cdev = (struct ctrl_dev *)CTRL_DEVICE_BASE;
diff --git a/board/ti/am335x/board.c b/board/ti/am335x/board.c
index 04c37e2..cc04426 100644
--- a/board/ti/am335x/board.c
+++ b/board/ti/am335x/board.c
@@ -30,10 +30,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-/* MII mode defines */
-#define MII_MODE_ENABLE		0x0
-#define RGMII_MODE_ENABLE	0x3A
-
 /* GPIO that controls power to DDR on EVM-SK */
 #define GPIO_DDR_VTT_EN		7
 
@@ -460,7 +456,7 @@ int board_eth_init(bd_t *bis)
 		cpsw_slaves[0].phy_if = cpsw_slaves[1].phy_if =
 				PHY_INTERFACE_MODE_MII;
 	} else {
-		writel(RGMII_MODE_ENABLE, &cdev->miisel);
+		writel((RGMII_MODE_ENABLE | RGMII_INT_DELAY), &cdev->miisel);
 		cpsw_slaves[0].phy_if = cpsw_slaves[1].phy_if =
 				PHY_INTERFACE_MODE_RGMII;
 	}