Fix parameters to support RDIMM for P2020DS

Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c

@@ -613,6 +613,7 @@ static void set_ddr_sdram_cfg_2(fsl_ddr_cfg_regs_t *ddr,
 #if defined(CONFIG_FSL_DDR3)
 	md_en = popts->mirrored_dimm;
 #endif
+	rcw_en = popts->registered_dimm_en;
 	qd_en = popts->quad_rank_present ? 1 : 0;
 	ddr->ddr_sdram_cfg_2 = (0
 		| ((frc_sr & 0x1) << 31)

board/freescale/p2020ds/ddr.c

@@ -68,7 +68,7 @@ const board_specific_parameters_t board_specific_parameters[][20] = {
 		{550, 680,    1,    4,   0x1f,    3,  0},
 		{681, 850,    1,    4,   0x1f,    4,  0}
 #else
-		{  0, 850,    2,    4,   0x1f,    4,  0},
+		{  0, 850,    2,    6,   0x1f,    4,  0},
 		{  0, 850,    1,    4,   0x1f,    4,  0}
 #endif
 	},
@@ -120,7 +120,7 @@ void fsl_ddr_board_options(memctl_options_t *popts,
 	/* Write leveling override */
 	popts->wrlvl_override = 1;
 	popts->wrlvl_sample = 0xa;
-	popts->wrlvl_start = 0x7;
+	popts->wrlvl_start = 0x8;
 	/* Rtt and Rtt_WR override */
 	popts->rtt_override = 1;
 	popts->rtt_override_value = DDR3_RTT_120_OHM;