Does anyone know where to find documentation about the boot sequence of the RockPi 4b?
I flashed the eMMC with a third party image, everything works just fine, but I’m not happy with the OS I installed and want to try something else. From what I read, the Rock Pi 4 gives priority to eMMC over microSD when booting. I also found info that suggests the u-boot stage (in eMMC) could be configured to resume boot from SD. However I found no concrete instructions how to skip boot from the eMMC.
I know that I could remove the eMMC and re-flash it with an SD to eMMC adapter.
But I have no such adapter and that method is unpractical if I want to try different OSes (the eMMC module is not easily accessible, it’s under the heatsink).
I’m reasonably familiar with boot process in PCs, but it seems that the boot process here is very different and my knowledge about PCs is useless .
Thanks in advance.