Re: Problems with to large of a kernel

H. Peter Anvin (
2 Dec 1998 18:59:07 GMT

Followup to: <>
By author: Martin Mares <>
In newsgroup:
> > There have been numerous A20 gate problems with laptops and bootup - often
> > the external caches werent wired to the A20 switch for example
> One of that ugly notebook tricks is that some of they _delay_ A20
> switching... IBM Thinpad 560 being a horrific example.

That one is easy enough to work around, and recent kernels will indeed
sit in a loop until the memory is properly disambiguated. However, if
the A20 gate is *miswired* (not applied *before* the first level of
cache -- this is automatically correct if the #A20G input on 486 and
higher CPUs is used) then there is serious trouble.


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