Package: u-boot-imx Version: 2017.11 Disable the DDR calibration on DH iMX6 , since the calibration is sometimes unstable/unreliable on T-topology.
>From a0ad6b8cbff2777ed57ec821337ef6cf94e4e609 Mon Sep 17 00:00:00 2001 From: Marek Vasut <ma...@denx.de> Date: Fri, 15 Dec 2017 09:24:30 +0100 Subject: [PATCH] Disable DDR calibration on DH iMX6
The DDR DRAM calibration doesn't work reliably on T-topology, so disable it altogether. Signed-off-by: Marek Vasut <ma...@denx.de> --- ...sable-DDR-DRAM-calibration-DHCOM-i.MX6-PD.patch | 31 ++++++++++++++++++++++ debian/patches/series | 2 ++ 2 files changed, 33 insertions(+) create mode 100644 debian/patches/dh_imx6/0001-ARM-imx6-Disable-DDR-DRAM-calibration-DHCOM-i.MX6-PD.patch diff --git a/debian/patches/dh_imx6/0001-ARM-imx6-Disable-DDR-DRAM-calibration-DHCOM-i.MX6-PD.patch b/debian/patches/dh_imx6/0001-ARM-imx6-Disable-DDR-DRAM-calibration-DHCOM-i.MX6-PD.patch new file mode 100644 index 0000000000..eb6734c1bf --- /dev/null +++ b/debian/patches/dh_imx6/0001-ARM-imx6-Disable-DDR-DRAM-calibration-DHCOM-i.MX6-PD.patch @@ -0,0 +1,31 @@ +From 10e8989152a667adb09f4a1beb2e070fe44a642e Mon Sep 17 00:00:00 2001 +From: Marek Vasut <ma...@denx.de> +Date: Mon, 11 Dec 2017 15:59:53 +0100 +Subject: [PATCH] ARM: imx6: Disable DDR DRAM calibration DHCOM i.MX6 PDK + +The DDR DRAM calibration doesn't work on T-topology sometimes, so disable it. + +Signed-off-by: Marek Vasut <ma...@denx.de> +Cc: Stefano Babic <sba...@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); +- + /* Clear the BSS. */ + memset(__bss_start, 0, __bss_end - __bss_start); + +-- +2.11.0 + diff --git a/debian/patches/series b/debian/patches/series index a96b8029f9..fda8785caa 100644 --- a/debian/patches/series +++ b/debian/patches/series @@ -32,3 +32,5 @@ firefly/fdtfile test-imagetools-test-fixes upstream/0001-ARM-imx6-Adjust-DDR-DRAM-settings-on-DHCOM-i.MX6-PDK.patch + +dh_imx6/0001-ARM-imx6-Disable-DDR-DRAM-calibration-DHCOM-i.MX6-PD.patch -- 2.15.0
