From: Stefan Eichenberger stefan.eichenberger@toradex.com

Running a memtest in U-Boot and Linux shows that some Colibri iMX6 produce bitflips at temperatures above 60°C. This happens because the RALAT and WALAT values on the Colibri iMX6 are too low. The problems were introduced by commit 09dbac8174c4 ("mx6: ddr: Restore ralat/walat in write level calibration") before the calibration process overwrote the values and set them to the maximum value. With this commit, we make sure that the RALAT and WALAT values are set to the maximum values again. This has been proven to work for years.

Fixes: 09dbac8174c4 ("mx6: ddr: Restore ralat/walat in write level calibration") Signed-off-by: Stefan Eichenberger stefan.eichenberger@toradex.com Signed-off-by: Francesco Dolcini francesco.dolcini@toradex.com --- board/toradex/colibri_imx6/colibri_imx6.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/board/toradex/colibri_imx6/colibri_imx6.c b/board/toradex/colibri_imx6/colibri_imx6.c index 65e0e9a156ab..677caa4a4ebc 100644 --- a/board/toradex/colibri_imx6/colibri_imx6.c +++ b/board/toradex/colibri_imx6/colibri_imx6.c @@ -767,8 +767,7 @@ MX6_MMDC_P1_MPRDDQBY3DL, 0x33333333, /* * MDMISC mirroring interleaved (row/bank/col) */ -/* TODO: check what the RALAT field does */ -MX6_MMDC_P0_MDMISC, 0x00081740, +MX6_MMDC_P0_MDMISC, 0x000b17c0,

/* * MDSCR con_req @@ -900,8 +899,7 @@ MX6_MMDC_P1_MPRDDQBY3DL, 0x33333333, /* * MDMISC mirroring interleaved (row/bank/col) */ -/* TODO: check what the RALAT field does */ -MX6_MMDC_P0_MDMISC, 0x00081740, +MX6_MMDC_P0_MDMISC, 0x000b17c0,

/* * MDSCR con_req