Messages in this thread | | | From | Stephen Early <> | Subject | Re: holes for ISA boards... | Date | Sun, 13 Jun 1999 12:11:56 +0100 |
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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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