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| author | Fabio Estevam <fabio.estevam@freescale.com> | 2013-05-05 16:11:59 +0000 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2013-05-06 09:55:52 +0200 |
| commit | 286a88cf34bcfec4a1051b5ee3553277e6c31e2e (patch) | |
| tree | 59ad5d5e2f52b2afc05a4788756d56a4f9e1f9bf /arch/arm/cpu | |
| parent | 0b323439a52daca171cf107a8f479a3ce18d1d3a (diff) | |
| download | blackbird-obmc-uboot-286a88cf34bcfec4a1051b5ee3553277e6c31e2e.tar.gz blackbird-obmc-uboot-286a88cf34bcfec4a1051b5ee3553277e6c31e2e.zip | |
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 <fabio.estevam@freescale.com>
Diffstat (limited to 'arch/arm/cpu')
| -rw-r--r-- | arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c | 9 |
1 files changed, 9 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 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; |
