[U-Boot] [PATCH 03/10] Enable ECC on/off control in hwconfig

[York Sun]

Add fsl_ddr:ecc=on in hwconfig. If ECC is enabled in board configuration file,
ECC can be turned on/off by this switch. If this switch is omitted, it is ON by
default.

Syntax is
hwconfig=fsl_ddr:ecc=on

Signed-off-by: York Sun <yorksun at freescale.com>
---
 arch/powerpc/cpu/mpc8xxx/ddr/options.c |    9 ++++++---
 doc/README.fsl-ddr                     |    7 +++++++
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/options.c b/arch/powerpc/cpu/mpc8xxx/ddr/options.c
index ca5f63e..f876e20 100644
--- a/arch/powerpc/cpu/mpc8xxx/ddr/options.c
+++ b/arch/powerpc/cpu/mpc8xxx/ddr/options.c
@@ -82,10 +82,13 @@ unsigned int populate_memctl_options(int all_DIMMs_registered,
 	/* Operational Mode Paramters */
 
 	/* Pick ECC modes */
-#ifdef CONFIG_DDR_ECC
-	popts->ECC_mode = 1;		  /* 0 = disabled, 1 = enabled */
-#else
 	popts->ECC_mode = 0;		  /* 0 = disabled, 1 = enabled */
+#ifdef CONFIG_DDR_ECC
+	if (hwconfig_sub("fsl_ddr", "ecc")) {
+		if (hwconfig_subarg_cmp("fsl_ddr", "ecc", "on"))
+			popts->ECC_mode = 1;
+	} else
+		popts->ECC_mode = 1;
 #endif
 	popts->ECC_init_using_memctl = 1; /* 0 = use DMA, 1 = use memctl */
 
diff --git a/doc/README.fsl-ddr b/doc/README.fsl-ddr
index 1657ef6..9e3c539 100644
--- a/doc/README.fsl-ddr
+++ b/doc/README.fsl-ddr
@@ -78,6 +78,13 @@ If the DDR controller supports address hashing, it can be enabled by hwconfig.
 Syntax is:
 hwconfig=fsl_ddr:addr_hash=true
 
+Memory controller ECC on/off
+============================
+If ECC is enabled in board configuratoin file, i.e. #define CONFIG_DDR_ECC,
+ECC can be turned on/off by hwconfig.
+
+Syntax is
+hwconfig=fsl_ddr:ecc=off
 
 Memory testing options for mpc85xx
 ==================================
-- 
1.7.0.4