Re: Booting big kernels on IBM ThinkPad 770X

H. Peter Anvin (
2 Dec 1998 23:44:04 GMT

Followup to: <98120217075102.16084@ws-cal>
By author: Christian Lademann <>
In newsgroup:
> 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*


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