IMX8M_how to write LPDDR4 MR26/MR33 mode register？

[alexjiang]

IMX8M_how to write LPDDR4 MR26 mode register？

Platform： IMX8M + 4Gb 2channel 32bit LPDDR4；

1. We need to use LPDDR4 mode register: MR26/MR33（in JEDEC this MR26 is RFU），

    so we want to write a code to MR26/MR33，how to operate？

1> if IMX8M have register map to MR26/MR33， we can write the register address；

2> or if we can send the command： MRW  in uboot？ how to operate？

[igorpadykov]

Hi Alex

seems MR registers can be set using MRCTRL0/1 registers described in

sect.9.3.3.1.6/7 Mode Register Read/Write Control Register
i.MX 8M Dual/8M QuadLite/8M Quad Applications Processors Reference Manual

uboot lpddr4_mr_write() example

ddrphy_utils.c\imx8m\ddr\drivers - uboot-imx - i.MX U-Boot 

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------