ACPI Spec. 4.0a, 18.104.22.168 Address Space Range Descriptor, Table 6-40 on
page 260 implies _LEN > 0, _MIF = 1, and _MAF = 1 is the only valid
combination for _CRS. However, I found a _CRS example on page, which
has _LEN = _MIF = _MAF = 0. Can you please clarify? If the table is
correct, iasl should have warned about it. I think iasl currently
treats _PRS and _CRS equally.