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How to use the PCA9450B PMIC with iMX8 Nano & DDR4

Question asked by frank van hooft on May 20, 2020
Latest reply on May 24, 2020 by Wigros Sun

The PCA9450B BUCK6 regulator, used for NVCC_DRAM, defaults to 1.1V 

However "standard" DDR4 needs 1.2V  (LPDDR4 uses 1.1V).

Obviously BUCK6 in the PMIC needs to be programmed to 1.2V, very early in the Linux boot process, before any use of the DDR4 is attempted.

 

What's the procedure for doing this?

 

Thanks.

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