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

Chin Liang See
2016-10-12T16:13:39Z

On Mon, 2016-10-10 at 10:52 -0500, Dinh Nguyen wrote:
> From: Dinh Nguyen <dinguyen@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@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