Messages in this thread | | | From | (H. Peter Anvin) | Subject | Re: Problems with to large of a kernel | Date | 2 Dec 1998 18:59:07 GMT |
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Followup to: <19981202125328.11383@atrey.karlin.mff.cuni.cz> By author: Martin Mares <mj@atrey.karlin.mff.cuni.cz> In newsgroup: linux.dev.kernel > > > 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.
-hpa
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