The ARMv8 server platforms follow a common standard, SBSA. Which is essentially taking the most-hated parts of the x86 platform, ACPI and UEFI, but once you suppress the gag reflex it does get the job done, and you have a mostly x86-like experience that you just boot a generic armv8 distro and it all autodetects stuff on the fly and it all just works.
Haven't heard of any of the single-board platforms adopting it, though.
I really wish we would see a standard Arm kernel instruction set come along and get adopted by every manufacturer who isn't doing something unusual enough to justify a custom architecture.