[U-Boot] [RFC 4/4] arm: socfpga: scrub the SDRAM to properly enable ECC support

[Chin Liang See]

On Mon, 2016-10-10 at 10:52 -0500, Dinh Nguyen wrote:
> From: Dinh Nguyen <dinguyen at opensource.altera.com>
> 
> In order for SDRAM ECC to work correctly, the SDRAM needs to get
> zero'd which
> enables the ECC bit. By using the PL330 DMA to fill the SDRAM with
> zeroes,
> the operation is completed in ~1.2 seconds, versus ~14 seconds with a
> memset.
> 
> Signed-off-by: Dinh Nguyen <dinguyen at opensource.altera.com>
> ---
>  arch/arm/mach-socfpga/include/mach/reset_manager.h | 21
> ++++++++++++++++
>  arch/arm/mach-socfpga/include/mach/sdram.h         |  2 ++
>  arch/arm/mach-socfpga/spl.c                        |  8 +++++++
>  arch/arm/mach-socfpga/wrap_sdram_config.c          | 28
> ++++++++++++++++++++++
>  configs/socfpga_cyclone5_defconfig                 |  2 ++
>  5 files changed, 61 insertions(+)
> 

[..]

> diff --git a/arch/arm/mach-socfpga/wrap_sdram_config.c
> b/arch/arm/mach-socfpga/wrap_sdram_config.c
> index 31cc7de..dfa6423 100644
> --- a/arch/arm/mach-socfpga/wrap_sdram_config.c
> +++ b/arch/arm/mach-socfpga/wrap_sdram_config.c
> @@ -5,8 +5,10 @@
>   */
>  
>  #include <common.h>
> +#include <dma.h>
>  #include <errno.h>
>  #include <asm/arch/sdram.h>
> +#include <asm/pl330.h>
>  
>  /* Board-specific header. */
>  #include <qts/sdram_config.h>
> @@ -310,3 +312,29 @@ const struct socfpga_sdram_misc_config
> *socfpga_get_sdram_misc_config(void)
>  {
>  	return &misc_config;
>  }
> +
> +#if (CONFIG_HPS_SDR_CTRLCFG_CTRLCFG_ECCEN == 1)
> +/* init the whole SDRAM ECC bit */
> +void sdram_ecc_init(void)
> +{
> +	struct pl330_transfer_struct pl330;
> +	u8 pl330_buf[2000];

Would need size of 2500 if the SDRAM size is 2GB

Thanks
Chin Liang