On Fri, 23 Nov 2007, Christos Zoulas wrote:
> I agree with Matthias here. I don't think that isa should be mandatory
> for ACPI to work.

ACPI is used to locate legacy ISA devices. Our ACPI code passes an 
isa_chipset_tag_t to each one of these device drivers today, which they 
all use (for isa_intr_establish, isadma).

You will not get away with a kernel that contains com@acpi but no isa0.

Cheers,
Jared