RK3588 bare metal boot sequence

Everything needed to bring up common hardware.

MMU

.. Some notes on MMU setup ..

Secure GRF init

A small sequence (100LoC) is needed to mark needed memory regions as secure. This is done primarily through the main SGRF (Secure General Register File). There are actually a few SGRFs, and they are all undocumented. This is necessary to use the VOP and setup a framebuffer.

PMU

A few power domains need to be brought up in order to make some hardware accessible. These onboard devices are completely powered off on reset. If you try to read/write to their mmio, you will get a translation error. - PD_PHP - PD_PCIE - PD_GMAC - PD_SECURE - PD_VOP - PD_VO0 - PD_VO1 Powering on a power domain is fairly well documented in the TRM.

Other hardware such as GIC, UART, and other essentials belong to the ALIVE power domain. It is powered up on with a reset, and cannot be powered off.