[U-Boot] [PATCH 3/9] imx: mx6: ddr correct tRFC and tXS
Peng Fan
Peng.Fan at freescale.com
Mon Aug 17 05:29:20 CEST 2015
To Chip density 4Gb, tRFC should be 300ns, see
"Table 61 — Refresh parameters by device density" of JESD79-3E.
tXS(min) is max(5nCK, tRFC(min) + 10ns).
Signed-off-by: Peng Fan <Peng.Fan at freescale.com>
Cc: Stefano Babic <sbabic at denx.de>
Cc: Tim Harvey <tharvey at gateworks.com>
---
arch/arm/cpu/armv7/mx6/ddr.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/cpu/armv7/mx6/ddr.c b/arch/arm/cpu/armv7/mx6/ddr.c
index 28fa3cf..3ec3e79 100644
--- a/arch/arm/cpu/armv7/mx6/ddr.c
+++ b/arch/arm/cpu/armv7/mx6/ddr.c
@@ -357,8 +357,8 @@ void mx6_dram_cfg(const struct mx6_ddr_sysinfo *sysinfo,
txs = DIV_ROUND_UP(170000, clkper) - 1;
break;
case 4: /* 4Gb per chip */
- trfc = DIV_ROUND_UP(260000, clkper) - 1;
- txs = DIV_ROUND_UP(270000, clkper) - 1;
+ trfc = DIV_ROUND_UP(300000, clkper) - 1;
+ txs = DIV_ROUND_UP(310000, clkper) - 1;
break;
case 8: /* 8Gb per chip */
trfc = DIV_ROUND_UP(350000, clkper) - 1;
--
1.8.4
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