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Linux: Need early workaround for cpuidle power down on A53 core so debugger doesn't hang

Hello,

ARM's advice on disabling cpuidle (powerdown to cores) after Linux boots works fine.  However, I find that the debugger still hangs in cases where the kernel hasn't booted all the way, and I need to connect the debugger. 

Can you provide advice on how to disable cpuidle properly at compile time on a Linux Kernel > 4.0?

https://community.arm.com/developer/tools-software/oss-platforms/w/docs/287/common-issues-using-ds-5-with-juno

Thank you