how to change read/write latency of dram on imx93evk?

[jekim]

Hello,

I'm using the imx93evk. The default dram configurations can be automatically generated by config tool per clock frequency selection. btw, increasing/decreasing the read/write latency is not supported by the config tool. I tried to directly change the lpddr4x_timing.c file to increase the latency. (RL 36 to 40, WL 16 to 18) The two c files are attached. TIMING_CFG_1, TIMING_CFG_2, TIMING_CFG_3, and MR2 register are modified on the new file. However, the u-boot failed with the message of "Malloc buffer failed". please let me know how to achieve this condition change.

Thanks.

[pengyong_zhang]

Hi @jekim 

You can follow the bwlow picture set your WL RL.

ps : We do not suggest customer modify this parameters , different value follow the different  DDR frequency and mode.

B.R

[jekim]

Hi @pengyong_zhang ,

It is required to change the latency at a clock frequency for the failure analysis. Is it impossible or too complicated?

Thanks.