Re: Booting big kernels on IBM ThinkPad 770X

Hans Lermen (
Thu, 3 Dec 1998 16:10:39 +0100 (MET)

On 2 Dec 1998, H. Peter Anvin wrote:

> 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*

So what is wrong in using a 2.0.36 kernel?

BTW: if you consider the 'Toshiba Tecra' patch in 2.1.x beeing enough for
this odd boot behave on the ThinkPad, sorry, but you are wrong.
IMHO Christian's one-liner is just the info we did miss for a long time.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
Please read the FAQ at