From 286a88cf34bcfec4a1051b5ee3553277e6c31e2e Mon Sep 17 00:00:00 2001 From: Fabio Estevam Date: Sun, 5 May 2013 16:11:59 +0000 Subject: mxs: Explain why some mx23 DDR registers are not configured Put an explanation in the source code as to why some DDR registers do not need to be configured. Signed-off-by: Fabio Estevam --- arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'arch/arm') diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c index 4ed197b51d..3902406441 100644 --- a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c +++ b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c @@ -127,6 +127,15 @@ static void initialize_dram_values(void) mxs_adjust_memory_params(dram_vals); + /* + * HW_DRAM_CTL27, HW_DRAM_CTL28 and HW_DRAM_CTL35 are not initialized as + * per FSL bootlets code. + * + * mx23 Reference Manual marks HW_DRAM_CTL27 and HW_DRAM_CTL28 as + * "reserved". + * HW_DRAM_CTL8 is setup as the last element. + * So skip the initialization of these HW_DRAM_CTL registers. + */ for (i = 0; i < ARRAY_SIZE(dram_vals); i++) { if (i == 8 || i == 27 || i == 28 || i == 35) continue; -- cgit v1.2.1