From: York Sun yorksun@freescale.com
If less than 8 ECC pins are used for DDR data bus width smaller than 64 bits, the 8-bit ECC code will be transmitted/received across several beats, and it will be used to check 64-bits of data once 8-bits of ECC are accumulated.
Signed-off-by: York Sun yorksun@freescale.com --- drivers/ddr/fsl/ctrl_regs.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/ddr/fsl/ctrl_regs.c b/drivers/ddr/fsl/ctrl_regs.c index 78e82bb..4c7a1e8 100644 --- a/drivers/ddr/fsl/ctrl_regs.c +++ b/drivers/ddr/fsl/ctrl_regs.c @@ -693,6 +693,7 @@ static void set_ddr_sdram_cfg(fsl_ddr_cfg_regs_t *ddr, unsigned int x32_en = 0; /* x32 enable */ unsigned int pchb8 = 0; /* precharge bit 8 enable */ unsigned int hse; /* Global half strength override */ + unsigned int acc_ecc_en = 0; /* Accumulated ECC enable */ unsigned int mem_halt = 0; /* memory controller halt */ unsigned int bi = 0; /* Bypass initialization */
@@ -736,6 +737,9 @@ static void set_ddr_sdram_cfg(fsl_ddr_cfg_regs_t *ddr, ba_intlv_ctl = popts->ba_intlv_ctl; hse = popts->half_strength_driver_enable;
+ /* set when ddr bus width < 64 */ + acc_ecc_en = (dbw != 0 && ecc_en == 1) ? 1 : 0; + ddr->ddr_sdram_cfg = (0 | ((mem_en & 0x1) << 31) | ((sren & 0x1) << 30) @@ -752,6 +756,7 @@ static void set_ddr_sdram_cfg(fsl_ddr_cfg_regs_t *ddr, | ((x32_en & 0x1) << 5) | ((pchb8 & 0x1) << 4) | ((hse & 0x1) << 3) + | ((acc_ecc_en & 0x1) << 2) | ((mem_halt & 0x1) << 1) | ((bi & 0x1) << 0) );