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SubjectRe: holes for ISA boards...
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> Stephen's patch supports arbitrary sets of memory ranges, and works
> with any ACPI-compliant motherboard (in theory). It seems reasonable
> to my eyes.

ACPI is a bit of a red herring here; the int 0x15, eax=0xe820 BIOS
call has been around longer than the ACPI spec. The ACPI people just
extended it with two new memory range types, to support their own
configuration information; code unaware of the ACPI spec. will see
those regions as unusable.

I haven't found any Pentium-class motherboard that does not support
this call. I have found older motherboards that don't, and one which
gives odd results ("Out of memory" error when the call is made!) -
which is one reason I didn't submit the patch when I wrote it.

It's probably safe to include the patch in the released kernel if it's
only included when compiling a kernel that will only run on Pentium
and above. It's only the code in setup.S that needs to be conditional;
the extended mem= parsing could be useful on all systems.

Steve Early

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