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i.MX6UL performance issues

Question asked by J S on Feb 24, 2016
Latest reply on Feb 29, 2016 by J S

For some reason our test i.MX6UL board is running slower than older i.MX28. Changing CCM_ANALOG_PLL_ARMn divider increases the performance slightly, but it's still about 3 times slower in integer calculcations.

 

What are correct clock register settings for full CPU speed (528MHz). Changing CACRR[ARM_PODF] divider to 0 causes CPU to hang. Is there some specific procedure for changing this bit?

 

Using U-Boot from Freescale git and vanilla kernel 4.4.2. U-boot is loaded via serial downloader, then Linux kernel is loaded from SD card and booted. Kernel CPU frequency scaling is disabled.

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