Are you keeping up with ACPI?
Sometimes it is not feasible to get UART access on consumer blackbox devices (e.g. Lumia 950XL). In the case of ARM ACPI debugging, the lack of UART access may make early boot debug incredibly difficult. Starting from Linux Kernel 5.0, it is now possible to enable FrameBuffer-based early kernel display. All you need to do… Continue reading Debugging early ARM ACPI bringup without UART