Re: Problems with to large of a kernel

H. Peter Anvin (hpa@transmeta.com)
2 Dec 1998 18:59:07 GMT

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

-- 
    PGP: 2047/2A960705 BA 03 D3 2C 14 A8 A8 BD  1E DF FE 69 EE 35 BD 74
    See http://www.zytor.com/~hpa/ for web page and full PGP public key
        I am Bahá'í -- ask me about it or see http://www.bahai.org/
   "To love another person is to see the face of God." -- Les Misérables


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/