Subject: Re: [U-Boot] [PATCH v1] colibri_imx7: boot kernel in secure mode
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?
The upstream maintainer rejected the legacy method for i.MX7, so in upstream psci was used, with psci, the kernel is booted in non-secure mode.
Regards, Peng.
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.