powerpc/mpc85xx:Add support of B4420 SoC

B4420 is a reduced personality of B4860 with fewer core/clusters(both SC3900
and e6500), fewer DDR controllers, fewer serdes lanes, fewer SGMII interfaces and
reduced target frequencies.

Key differences between B4860 and B4420
----------------------------------------
B4420 has:
1. Fewer e6500 cores: 1 cluster with 2 e6500 cores
2. Fewer SC3900 cores/clusters: 1 cluster with 2 SC3900 cores per cluster.
3. Single DDRC
4. 2X 4 lane serdes
5. 3 SGMII interfaces
6. no sRIO
7. no 10G

Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/arch/powerpc/include/asm/config_mpc85xx.h b/arch/powerpc/include/asm/config_mpc85xx.h
index 856ae95..f957fa3 100644
--- a/arch/powerpc/include/asm/config_mpc85xx.h
+++ b/arch/powerpc/include/asm/config_mpc85xx.h
@@ -525,6 +525,27 @@
 #define CONFIG_SYS_FSL_ERRATUM_A_004934
 #define CONFIG_SYS_CCSRBAR_DEFAULT	0xfe000000
 
+#elif defined(CONFIG_PPC_B4420)
+#define CONFIG_SYS_PPC64		/* 64-bit core */
+#define CONFIG_FSL_CORENET		/* Freescale CoreNet platform */
+#define CONFIG_SYS_FSL_QORIQ_CHASSIS2	/* Freescale Chassis generation 2 */
+#define CONFIG_SYS_FSL_QMAN_V3		/* QMAN version 3 */
+#define CONFIG_MAX_CPUS			2
+#define CONFIG_SYS_FSL_NUM_CC_PLLS	4
+#define CONFIG_SYS_FSL_NUM_LAWS		32
+#define CONFIG_SYS_FSL_SEC_COMPAT	4
+#define CONFIG_SYS_NUM_FMAN		1
+#define CONFIG_SYS_NUM_FM1_DTSEC	4
+#define CONFIG_NUM_DDR_CONTROLLERS	1
+#define CONFIG_SYS_FSL_DDR_VER		FSL_DDR_VER_4_7
+#define CONFIG_SYS_FMAN_V3
+#define CONFIG_SYS_FM_MURAM_SIZE	0x60000
+#define CONFIG_SYS_FSL_TBCLK_DIV	16
+#define CONFIG_SYS_FSL_PCIE_COMPAT	"fsl,qoriq-pcie-v2.4"
+#define CONFIG_SYS_FSL_USB1_PHY_ENABLE
+#define CONFIG_SYS_FSL_ERRATUM_A_004934
+#define CONFIG_SYS_CCSRBAR_DEFAULT	0xfe000000
+
 #elif defined(CONFIG_PPC_B4860)
 #define CONFIG_SYS_PPC64		/* 64-bit core */
 #define CONFIG_FSL_CORENET		/* Freescale CoreNet platform */