summaryrefslogtreecommitdiff
path: root/arch/arm/cpu
diff options
context:
space:
mode:
authorOtavio Salvador <otavio@ossystems.com.br>2013-02-23 02:43:05 +0000
committerStefano Babic <sbabic@denx.de>2013-03-07 17:22:57 +0100
commit89075d3f4f5550638f0bf656046af5ca0306bdd7 (patch)
tree5d33de4d9af072ad5a25ab28c667001cf6b56cbd /arch/arm/cpu
parenta74dbf2734e8c86220dea159c242149d9acc61e1 (diff)
downloadu-boot-imx-89075d3f4f5550638f0bf656046af5ca0306bdd7.zip
u-boot-imx-89075d3f4f5550638f0bf656046af5ca0306bdd7.tar.gz
u-boot-imx-89075d3f4f5550638f0bf656046af5ca0306bdd7.tar.bz2
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>
Diffstat (limited to 'arch/arm/cpu')
-rw-r--r--arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c4
1 files changed, 4 insertions, 0 deletions
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
}