Linux - 2020.2 English

Zynq UltraScale+ MPSoC Software Developer Guide (UG1137)

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2020.2 English

Linux executes on the EL1 level, and the communication between Linux and the ATF software layer is realized using SMC calls.

Power management features based on the EEMI API have been ported to the Linux kernel, ensuring that the Linux-centric power management features utilize the EEMI services provided by the PMU.

Additionally, the EEMI API can be access directly via debugfs for debugging purposes. Note that direct access to the EEMI API through debugfs will interfere with the kernel power management operations and may cause unexpected problems.

All the Linux power management features presented in this chapter are available in the PetaLinux default configuration.