From 7dbda25ecd6d7cba13d29161675309ca43e3ba12 Mon Sep 17 00:00:00 2001 From: Fabio Estevam Date: Mon, 29 Aug 2016 20:37:16 -0300 Subject: [PATCH] mx6ul_14x14_evk: Pass refsel and refr fields to avoid hang When running a NXP 4.1 kernel with U-Boot mainline on a mx6ul-evk, we observe a hang when going into the lowest operational point of cpufreq. This hang issue does not happen on the NXP U-Boot version. After comparing the SPL DDR initialization against the DCD table from NXP U-Boot, the key difference that causes the hang is the MDREF register setting: DATA 4 0x021B0020 0x00000800 ,which means: REF_SEL = 0 --> Periodic refresh cycle: 64kHz REFR = 1 ---> Refresh Rate - 2 refreshes So adjust the MDREF initialization for mx6ul_evk accordingly to fix the kernel hang issue at low bus frequency. Reported-by: Eric Nelson Signed-off-by: Fabio Estevam Reviewed-by: Eric Nelson --- board/freescale/mx6ul_14x14_evk/mx6ul_14x14_evk.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/board/freescale/mx6ul_14x14_evk/mx6ul_14x14_evk.c b/board/freescale/mx6ul_14x14_evk/mx6ul_14x14_evk.c index 32953aea2b..126e499f92 100644 --- a/board/freescale/mx6ul_14x14_evk/mx6ul_14x14_evk.c +++ b/board/freescale/mx6ul_14x14_evk/mx6ul_14x14_evk.c @@ -804,8 +804,8 @@ struct mx6_ddr_sysinfo ddr_sysinfo = { .sde_to_rst = 0x10, /* 14 cycles, 200us (JEDEC default) */ .rst_to_cke = 0x23, /* 33 cycles, 500us (JEDEC default) */ .ddr_type = DDR_TYPE_DDR3, - .refsel = 1, /* Refresh cycles at 32KHz */ - .refr = 7, /* 8 refresh commands per refresh cycle */ + .refsel = 0, /* Refresh cycles at 64KHz */ + .refr = 1, /* 2 refresh commands per refresh cycle */ }; static struct mx6_ddr3_cfg mem_ddr = { -- 2.39.2