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SubjectRe: How does the Pentium II work with Linux?
FromCarl Kumaradas <>
Date30 Oct 1997 18:16:39 -0500
"Christopher E. Brown" <cbrown@Alaska.NET> writes:
> 	The MAJOR:  The PII L2 cache cannot handle more than 512MB due to
> a *feature*. :(  If you have more than 512MB on board (since at this po=
> int
> the PPro and PII use the same chipsets most large MBs will go to 1024MB=
> )
> with either a single or dual PII your dead in the water.
> 
> 	When writing to memory above the 512MB mark the write will be
> mirrored to a location below 512, so if one were to stash some data fro=
> m
> 513 - 516, guess what, you just wiped the kernel with a mirrored write =
> in
> the first 4 megs. :(  The only way around this is to disable L2 cache
> totally, or (if bios supports it) disable L2 cache for 513 on.  Either
> way, past 512 is useless, either you crash or you reduce system speed t=
> o
> 486 levels.

Can't you specify "mem=512M" as a kernel option to get around this as
well?

Carl.
-- 
J. Carl Kumaradas                           Ontario Cancer Institute
ckumarad@oci.utoronto.ca                    University of Toronto

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