Messages in this thread | | | Date | Fri, 22 Feb 2008 10:55:36 +0100 | From | Andi Kleen <> | Subject | Re: 2.6.25-rc1 xen pvops regression |
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Alan Cox wrote: >> I'd been meaning to ask this. So the machines you have which don't >> describe 0xf0000 as reserved also don't describe it as RAM? (I guess >> it's either a hole in the table or one of the other e820 types). > > Making 0xf0000 bus addresses RAM is probably a bad idea anyway. Most OS's > treat the E820 map with paranoia because we do see real PCs which > variously claim that the BIOS ROM space is RAM, ACPI, Reserved or just > forget to mention it.
Actually I switched 64bit over to trust e820 completely and not reserve 640k-1MB explicitly some time ago and AFAIK there hasn't been any reports that it causes problems.
So presumably trusting e802 is ok on modern systems (2003+)
-Andi
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