where to define clock frequency for DDR

srinivasaporam — Fri, 13 Nov 2015 20:52:02 GMT

Hi,

We have got custom board for which we have changed memory. Our memory module is 400 MHz module.

in our u-boot code at one place, we are trying to print memory frequency by using:

clock = mxc_get_clock(MXC_DDR_CLK) / 1000000U;

printf("clock: %dMHz", clock);

So, for reference board it is printing 400 MHz correctly, But for our board it is printing 528 MHz.

In LPDDR2 script file it is shown that

setmem /32

0x020c4018 =

0x00060324

//DDR clk to 400MHz

We need to define this in someplace (0x020c4018) as 0x00060324. wher it needs to defined so that mmc_get_clock returns correct value.

Re: where to define clock frequency for DDR

igorpadykov — Mon, 16 Nov 2015 01:34:54 GMT

Hi Srinivasa

usually this and other new ddr settings are defined in dcd header:

appropriate *.cfg file, like uboot/..mx6sabresd/mx6dl_4x_mt41j128.cfg

Best regards

igor

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