Read the Mode Registers in LPDDR4 /w i.MX8M

[george]

Dear all,

We want to read the Mode Registers during LPDDR4 operation to optimize the values of VREF_CA and VREF_DQ in RPA.

Are there any resources available for reference?

Best Regards,

George

[igorpadykov · Accepted solution]

Hi George

seems this could be done using MRCTRL registers described in

sect.9.3.3.1.6 Mode Register Read/Write Control Register  i.MX8M Reference Manual

for example one can look at lpddr4_mr_read() in
ddrphy_utils.c\imx8m\ddr\drivers - uboot-imx - i.MX U-Boot 

Best regards
igor
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[george]

Thanks

George