On Tue, May 22, 2012 at 08:28:55PM +0530, R, Sricharan wrote:
Hi Tom,
In OMAP5432 EMIF controlller supports DDR3 device. This patch adds support for ddr3 device intialization and configuration. Initialization sequence is done as specified in JEDEC specs. This also adds support for ddr3 leveling.
[snip]
@@ -975,8 +1070,12 @@ static void do_sdram_init(u32 base) ? ? ? ?* Changing the timing registers in EMIF can happen(going from one ? ? ? ?* OPP to another) ? ? ? ?*/
- ? ? if (!in_sdram)
- ? ? ? ? ? ? lpddr2_init(base, regs);
- ? ? if (!in_sdram) {
- ? ? ? ? ? ? if (omap_revision() != OMAP5432_ES1_0)
- ? ? ? ? ? ? ? ? ? ? lpddr2_init(base, regs);
- ? ? ? ? ? ? else
- ? ? ? ? ? ? ? ? ? ? ddr3_init(base, regs);
- ? ? }
In omap4+ land do we have any other way of telling which family we're on? ?I ask since I'm preparing to add DDR3 support to am33xx and I'd like to switch it over to the common emif framework as well.
I think the SDRAM_TYPE[31:29] EMIF_SDRAM_CONFIG register should tell the connected device at reset. I will cross confirm this on the board and tell.
OK. I can't find the omap5430 TRM quickly but on the am335x one, SDRAM_TYPE is 3 for DDR3, 2 for DDR2 and 1 for LPDDR1 and 0 for DDR1.