Messages in this thread | | | From | david parsons <> | Subject | Re: HIGH MEMORY access | Date | Fri, 3 Mar 2000 11:15:44 -0800 (PST) |
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> > > > >> From: Manfred Spraul [mailto:manfreds@colorfullife.com]
> > > > >> * max_pfn is set to the end if the last usable block. > > > > >> * then the ACPI tables follow --> they are behind max_pfn --> > > > > >> behind the > > > > >> end of mem_map.
> > > > <nathan.zook@amd.com> wrote: > > > > >This is changing. The new patches will be reclaim-enabled, so > > > > >those pages will be mapped, and the max_pfn-class variables will > > > > >reflect their presence.
> > > > From: orc@pell.portland.or.us [mailto:orc@pell.portland.or.us] > > > > Only if these pages are set as acpi reclaim memory; > > > > if they're marked as nvs and happen to be above the last > > > > ram section, max_pfn won't catch them.
> > nathan.zook@amd.com wrote:
> > > Marking them NVS is an error, but I've been leaning towards > > > mapping the NVS pages anyway.
> > From: david parsons [mailto:orc@pell.portland.or.us] > > Though if you find a bios that stuffs the nvs pages up near the > > top of 4gb, won't that make mem_map[] very large and thus > > potentially take all memory away from low-memory systems?
nathan.zook@amd.com wrote: > > Oh the joys of an inadequate spec! Sounds like it might be time for Smart > Reclaim(tm). Oh well. It will get worse.
I suspect that mapping roms and acpi memory into the regular memory segment might not be the most optimal way of doing things. The PCI code, once upon a time (and still?) set up their own memory segment to get at pci stuff that was in awkward places; this might be a good solution to mismatches between Linux's memory model and the way vendors might scatter things around in memory.
> And those Award bioses are the ones that dropped e801.
Quite possibly. I'm pretty some of the older award bioses still did e801, but since I wrote the fancy memory detection code e801 and 88 could both set the motherboard on fire and I'd never know until the fire department arrives.
____ david parsons \bi/ I'm not expecting any of the new Award bioses are likely \/ to ever spontaneously backport to any of my 366s, either.
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