Messages in this thread | | | From | (david parsons) | Subject | Re: holes for ISA boards... | Date | 15 Jun 1999 15:32:26 -0700 |
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In article <linux.kernel.19990615114254.A586@asmodean.local.network>, Mark Jefferys <mjeffery@europa.com> wrote: >On Sun, Jun 13, 1999 at 12:11:56PM +0100, Stephen Early wrote: > >% 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. > >Interesting. > >% 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 might be reasonable to blacklist the motherboard.
In the simple case, setting mem=<foo> on the command-line should circumvent any probing.
I've certainly not had any motherboard lock up on me when trying to do E820 (and this includes a lot of motherboards, including an ancient Pentia motherboard that doesn't support E820 or E801, but must have mem= specified if I want to access more than 64mb.)
But my fancy memory patch isn't Mr. Early's fancy memory patch, and it may behave differently on machines that don't support E820.
____ david parsons \bi/ On 2.0.28, it works without complaint. On 2.2.9, \/ weeeeeell, that's a different kind of story.
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