topic Re: Linux freez when MIPI & M4 are used in i.MX Processors

Linux freez when MIPI & M4 are used

urimashiach — Mon, 04 Nov 2019 10:35:38 GMT

Hello

Hardware: i.MX 7Dual revision 1.2 and 1.3

Software: Linux, based on NXP 4.14.98-2.0.0_ga.

Scenario:

* The M4 core is executing a program that continuously generates UART messages and changing the value of a GPIO.

* The MIPI display is active.

* The ambient temperature is 45 degrees Celsius.

* The measured temperature, by the A7, is 75C.

The following command is used to read the A7 temperature:

# cat /sys/class/thermal/thermal_zone0/temp

* The Linux get stuck after a few minutes.

* The problem doesn't occur if the M4 or the LVDS is not active.

* Some SOCs requires a higher temperature to recreate the problem.

Please let me know if additional information is needed.

Thanks,

Uri

Re: Linux freez when MIPI & M4 are used

CarlosCasillas — Wed, 20 Nov 2019 01:06:12 GMT

Hi Uri,

Have you considered the procedure mentioned on section 2.8.5 of the i.MX Linux Reference Manual document (IMXLXRM Rev. L4.14.98-2.0.0_ga), and also, the notes of Table 10 regarding the proper DTB Description according with the board revision on i.MX Linux Release Notes document (IMXLXRN Rev. L4.14.98-2.0.0_ga)?

Hope this will be useful for you.
Best regards!
/Carlos
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Re: Linux freez when MIPI & M4 are used

urimashiach — Thu, 21 Nov 2019 08:10:49 GMT

Hi Carlos,

Thank you for your help.

Please provide links to the documents from your reply:

* MXLXRM Rev. L4.14.98-2.0.0_ga

* IMXLXRN Rev. L4.14.98-2.0.0_ga

Thanks,

Uri

Re: Linux freez when MIPI & M4 are used

CarlosCasillas — Thu, 21 Nov 2019 21:40:14 GMT

Hi Uri,

These documents are part of the Linux BSP documentation package, available on the following link:

https://www.nxp.com/webapp/Download?colCode=imx-yocto-L4.14.98_2.0.0_ga

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Re: Linux freez when MIPI & M4 are used

urimashiach — Tue, 14 Jan 2020 11:41:37 GMT

Hi Carlos,

The SOC operation frequency was limited to 996MHz.
We are unable to reproduce the problem with SOC frequency of 996MHz.

Thank you for your help.