From: Otavio Salvador <otavio@ossystems.com.br>
Date: Sat, 23 Feb 2013 02:43:05 +0000 (+0000)
Subject: mx23: Document the tRAS lockout setting in memory initialization
X-Git-Tag: v2013.04-rc2~24^2~1^2~15
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=89075d3f4f5550638f0bf656046af5ca0306bdd7;p=oweals%2Fu-boot.git

mx23: Document the tRAS lockout setting in memory initialization

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@ossystems.com.br>
---

diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
index 4a0a5aac7c..fdac73cfaa 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
 }