Linux-kernel mailing list archive 1998-48,: Re: Booting big kernels on IBM ThinkPad 770X

# Re: Booting big kernels on IBM ThinkPad 770X

H. Peter Anvin (hpa@transmeta.com)
2 Dec 1998 23:44:04 GMT

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Followup to: <98120217075102.16084@ws-cal>
By author: Christian Lademann <cal@zls.de>
In newsgroup: linux.dev.kernel
>
> There is this problem with booting big kernel images on IBM ThinkPads:
> the ThinkPad boot-cycles before "Uncompressing linux ...".
> There are already two solutions for this problem:
>
> o Create a zImage instead of a bzImage
> o Boot from DOS with LOADLIN
>
> I think, I've found a third one:
> According to the Technical Reference Manual there is a special
> control port that, among other things, controls the ability of setting
> the A20-gate in real mode, which is initially disabled. It is bit 1 of
> the System Control Port A (0x92).
>
> I inserted a call to the following routine in setup.S just before setting A20
> and now my bzImage boots!
>

Let me guess: you're using an old kernel, right? *Sigh*

-hpa

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