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ddr clock configuration through synchronous mode from external oscillator not from CPU in u-boot

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ddr clock configuration through synchronous mode from external oscillator not from CPU in u-boot

‎07-28-2015 09:39 PM
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shubhasingh
Contributor I

Hi,

We are having a P1021 based custom board, in which the clock input to DDR is through ddr synchronous mode from external oscillator not from CPU, i want to support this in U-boot.

I am not getting a clue where to make this change in u-boot so that it supports DDR clocking from external oscillator. Can some body please point me out on this.

Regards,

Shubha

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‎08-05-2015 03:04 AM
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shubhasingh
Contributor I

Thanks.

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‎07-30-2015 07:34 AM
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Bulat
NXP Employee
NXP Employee

Clocking mode of the DDR is set on the board level, u-boot does not require any special change. Specifically the user should set proper 'cfg_ddr_pll[0:2]' POR configuration field in accordance with the input clock source (frequency), see section 4.5.3.2 of the Ref Manual for details.

Regards,

Bulat

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