How to make Linaro kernel 4.14 work in SMP on the Eragon 820 SOM?

Hi,

I'm trying to run Linaro with kernel 4.14 in SMP mode on the Eragon 820 SOM, which has a Snapdragon 820: https://eragon.einfochips.com/ products/system-on-modules/qualcomm-snapdragon-820- apq8096-eragon-eic-q820-200-som.html

When running in SMP mode, the system crashes on a regular basis.

When compiling with maxcpus=1 nosmp, it works fine

if I remove CPUs 2 and 3 from arch/arm64/boot/dts/qcom/msm8996.dtsi , it will boot and show 2 CPUs and will work fine.

I wonder what I need to do to make it work (not crash) with all 4 cores?

Akos