On 05/22/2012 08:27 AM, R, Sricharan wrote:
- ? ? 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.
ah, this is what is there on OMAP5. 3 for DDR3 4 for LPDDR2-S4, 5 for LPDDR2-S2
4/5 are listed as reserved here :( http://www.ti.com/lit/pdf/spruh73
Atleast DDR3 encoding is same. So we can differentiate bw DDR3 and 2 in same way. Is the reset value set correctly on am335x according to the device connected?
I'll have to do some checking as the code doesn't check that today.