[U-Boot] [PATCH 09/13] mx23: Document the tRAS lockout setting in memory initialization
Marek Vasut
marex at denx.de
Sat Feb 23 13:43:05 CET 2013
From: Otavio Salvador <otavio at ossystems.com.br>
Add a comment about the tRAS lockout setting of HW_DRAM_CTL08 to
enable the 'Fast Auto Pre-Charge' found in the memory chip. The
setting is applied after memory initialization and it is worth
document it.
Signed-off-by: Otavio Salvador <otavio at ossystems.com.br>
---
arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
index 4a0a5aa..fdac73c 100644
--- a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
+++ b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
@@ -120,6 +120,10 @@ static void initialize_dram_values(void)
writel(dram_vals[i], MXS_DRAM_BASE + (4 * i));
#ifdef CONFIG_MX23
+ /*
+ * Enable tRAS lockout in HW_DRAM_CTL08 ; it must be the last
+ * element to be set
+ */
writel((1 << 24), MXS_DRAM_BASE + (4 * 8));
#endif
}
--
1.7.10.4
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