powerpc/c29xpcie: add DDR ECC on off config setting

c29xpcie REV_A board DDR ECC chip has bad impedance in hardware,
force that kind of board to be DDR ECC off when booting.
Other version board config ECC on/off by hwconfig=fsl_ddr:ecc=on
in uboot enviroment.

Signed-off-by: Po Liu <Po.Liu@freescale.com>
Acked-by: York Sun <yorksun@freescale.com>

board/freescale/c29xpcie/ddr.c

@@ -9,6 +9,9 @@
 #include <asm/fsl_ddr_sdram.h>
 #include <asm/fsl_ddr_dimm_params.h>
 
+#include "cpld.h"
+
+#define C29XPCIE_HARDWARE_REVA	0x40
 /*
  * Micron MT41J128M16HA-15E
  * */
@@ -61,7 +64,9 @@ void fsl_ddr_board_options(memctl_options_t *popts,
 				dimm_params_t *pdimm,
 				unsigned int ctrl_num)
 {
+	struct cpld_data *cpld_data = (void *)(CONFIG_SYS_CPLD_BASE);
 	int i;
+
 	popts->clk_adjust = 4;
 	popts->cpo_override = 0x1f;
 	popts->write_data_delay = 4;
@@ -79,6 +84,9 @@ void fsl_ddr_board_options(memctl_options_t *popts,
 	popts->trwt_override = 1;
 	popts->trwt = 0;
 
+	if (in_8(&cpld_data->hwver) == C29XPCIE_HARDWARE_REVA)
+		popts->ecc_mode = 0;
+
 	for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
 		popts->cs_local_opts[i].odt_rd_cfg = FSL_DDR_ODT_NEVER;
 		popts->cs_local_opts[i].odt_wr_cfg = FSL_DDR_ODT_CS;

include/configs/C29XPCIE.h

@@ -433,6 +433,8 @@
 
 #define CONFIG_BAUDRATE		115200
 
+#define CONFIG_DEF_HWCONFIG	fsl_ddr:ecc=on
+
 #define	CONFIG_EXTRA_ENV_SETTINGS				\
 	"hwconfig=" __stringify(CONFIG_DEF_HWCONFIG)  "\0"	\
 	"netdev=eth0\0"						\