Armadeus 7.0 Troubleshots

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4.17 kernels random crashes

  • Due to NXP specifications changes, 4.17 kernel seems to have some problems when using CPU frequency scaling and/or i.MX6ULL at full speed (900MHz). Consequences are random kernel crashes with stack overflow/memory problems. For these reasons we recommend everyone using this kernel/release and i.MX6ULL to add a patch in patches/linux/4.17/.

This patch can be found in latest git tree: 

   https://sourceforge.net/p/armadeus/code/ci/master/tree/patches/linux/4.17/0112-ARM-dts-imx6ull-update-vdd_soc-voltage-for-900MHz-op.patch
  • Then we also recommend to de-activate CPU frequency scaling on i.MX6ULL and fix operating frequency (to put somewhere in your app starting script, here frequency is fixed to 900MHz):
   cd /sys/devices/system/cpu/cpu0/cpufreq/
   echo userspace > scaling_governor
   echo 900000 > scaling_setspeed
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