An open place to share compliance results of board's firmwares with BIOS, UEFI, ACPI, Multiboot... Anything your software (bootloader, OS...) may rely on. Every non ad hoc operating system highly relies on standardized interfaces that the firmware and the bootloader(s) are largely responsible for (e.g., the physical memory mapping, EFI services). Non compliant firmwares are likely to cause serious problems and undefined behaviours (e.g., bootloader errors, power management issues). Since firmwares of proprietary boards cannot be replaced with better ones, you could end up with an unusable board. So far, you can only hope and cross your fingers to purchase a board with a firmware correctly implementing the features your OS expects.