[U-Boot] [PATCH] ARM: imx6: Disable DDR DRAM calibration DHCOM i.MX6 PDK

[Fabio Estevam]

Hi Marek,

On Mon, Dec 11, 2017 at 1:19 PM, Marek Vasut <marex at denx.de> wrote:
> The DDR DRAM calibration doesn't work on T-topology sometimes, so disable it.
>
> Signed-off-by: Marek Vasut <marex at denx.de>
> Cc: Stefano Babic <sbabic at denx.de>
> ---
>  board/dhelectronics/dh_imx6/dh_imx6_spl.c | 4 ----
>  1 file changed, 4 deletions(-)
>
> diff --git a/board/dhelectronics/dh_imx6/dh_imx6_spl.c b/board/dhelectronics/dh_imx6/dh_imx6_spl.c
> index bb98f39f02..57ae7f15ce 100644
> --- a/board/dhelectronics/dh_imx6/dh_imx6_spl.c
> +++ b/board/dhelectronics/dh_imx6/dh_imx6_spl.c
> @@ -387,10 +387,6 @@ void board_init_f(ulong dummy)
>                                   &dhcom6sdl_grp_ioregs);
>         mx6_dram_cfg(&dhcom_ddr_info, &dhcom_mmdc_calib, &dhcom_mem_ddr);
>
> -       /* Perform DDR DRAM calibration */
> -       udelay(100);
> -       mmdc_do_dqs_calibration(&dhcom_ddr_info);

I also observed mmdc_do_dqs_calibration() failures and after applying
this patch from Eric they were gone:
https://lists.denx.de/pipermail/u-boot/2016-November/271596.html

Does this help to solve the mmdc_do_dqs_calibration() on your case too?