[U-Boot] [PATCH v1] colibri_imx7: boot kernel in secure mode

[Tobias Junghans]

Hi Igor,

thanks for your comments! Is there any solution, patch or workaround I can try 
to power on the 2nd CPU core in secure mode with mainline kernel?

Thanks and best regards

Tobias

> I'm afraid you're right.
> Just after a bit of time researching and discussing with Stefan, seems
> that we need to introduce two different wrappers for booting the
> mainline kernel and downstream NXP kernel.
> 
> * NXP kernel has legacy code to enable all cores, which works only when
> running in secure mode.
> * Mainline kernel, as you said before, does use PSCI for this, which
> is provided by U-boot (which adds proper psci nodes to the linux
> dtb on-fly before transferring control to the linux kernel entry point).
> When we try to load it in secure mode, it continues running on the same
> Secure PL1, and communication using SMC calling convention doesn't make
> sense at this case.