4GB LPDDR4 issue with iMX8MQ

[nirmalluhana]

Hi,

Release: Yocto-Morty (4.9.51_GA)

Board: i.MX8MQ based custom board

We working on iMX8MQ based custom board with 4GB LPDDR4. I have done changes at u-boot for 4GB LPDDR4 support. Now, when we boot-up board with 4GB configurations it prints a number of various register/memory dumps at the kernel level and these things working fine with 3GB configuration.

This behaviour happens only once at the boot-up time else it works fine with 4GB LPDDR4 configuration.

I have attached logs file for reference.

It is a known issue? Is there a fix/workaround?

Best regards,

Nirmal

[felixradensky]

Hi Nirmal,

The register dump you're seeing is most probably caused by GPU driver (galcore) crash. The driver was fixed in kernel 4.14.78 to properly handle 4GB of RAM. See linux-imx - i.MX Linux kernel 

Felix.

[nirmalluhana]

Hello Felix Radensky,

Thanks for your response.

As you mentioned this issue is resolved by upgrading kernel to 4.14.78 kernel version.

Best regards,

Nirmal

[igorpadykov]

Hi Nirmal

reason may be in revisions of ddr tool, for latest 2.10 i.MX8 MSCALE SERIES DDR Tool Release (V2.10) 

recommended to use L4.14.98 linux-imx - i.MX Linux kernel 

Linux L4.9.51 was used with rev.1.0 ddr tool.

Best regards
igor
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[nirmalluhana]

Hello Igor,

Thanks for your response.

This issue is occurred due to 4.9.51 kernel version and it is resolved in 4.14.78 kernel version.

Best regards,

Nirmal