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How to see the current value of phyVref in DFI?

Question asked by George Fukutomi on Aug 8, 2019
Latest reply on Aug 23, 2019 by George Fukutomi

Hi all,


Our i.MX8M prototype board sometimes freezes unexpectedly.

And we are checking the configuration parameters for LPDDR4.

Please tell me about phyVref.


According to the description in RPA, phyVref is updated during data training.

We added a (attached) command in u-boot to read registers in DFI using "helper.c\imx8m\ddr\drivers - uboot-imx - i.MX U-Boot" as a reference.


Fortunately, the command seems to work correctly.

However, we always see the same value as the phyVref value set in RPA.

*We read 0x54006 in DFI as the address for phyVref.


Can we see the updated phyVref?


Best Regards,