LPDDR4 tuning on DDR tool

[kevincheng]

Hi,

We use DDR tool 2.1 to tuning our new LPDDR4 memory on iMX8MQ. That pass the Calibration, and do the stress test, the result is fail. When we check "Disable DDR Memory Cache", and retest again, it pass. Then we direct use "Gen Code" and compiler with uboot, the result is my system sometime boot success and sometime boot fail on memory panic. Have any thing we can change on DDR tool or ds file?

Regards,

Kevin

[Yuri]

Hello,

  Disable DDR Memory Cache option,  when selected,  means, that DDR memory

is mapped as none-cacheable/none-buffable memory when you run stress test.

When using the cache the memory is heavy loaded; such configuration corresponds  

OS working. Therefore it makes sense to check the memory more carefully, using

the  Hardware Developer’s Guide.

https://www.nxp.com/docs/en/user-guide/IMX8MDQLQHDG.pdf 

In particular, use  section 3.(i.MX 8MDQLQ layout/routing recommendations)

Have a great day,
Yuri

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