Platform and OS Compatibility

"SFI-platforms" require an "SFI-OS"

"ACPI-platforms" require an "ACPI-OS"

"ACPI-SFI-OS" runs on SFI-platforms or ACPI-platforms

"ACPI-SFI-platform" makes little sense in practice.
Would run an ACPI-OS or an SFI-OS
An ACPI-SFI-OS would ignore SFI and run ACPI mode