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[openbeos] Re: HaikIu PXE boot
- From: "Axel Dörfler" <axeld@xxxxxxxxxxxxxxxx>
- To: openbeos@xxxxxxxxxxxxx
- Date: Sun, 7 Jan 2007 15:30:51 +0100 (MET)
"François Revol" <revol@xxxxxxx> wrote:
> > Marcus Overhagen <marcusoverhagen@xxxxxxxx> wrote:
> > > In protected mode, there shouldn't be any 1MB barrier. Something
> > > in
> > > the kernel's vm_init seems to go wrong when the page directory it
> > > at
> > > 0x100000.
> > I would rather think it's the boot loader's fault - it might mess
> > up
> > the pages there for some reason (for example when jumping into real
> > mode). Maybe we should look into this one day (ie. open a bug for
> > it).
> Could it be somehow related to A20 that must be enabled manually at
> some point ? Maybe you fill in the page tables before enabling A20 in
> which case you are actually overwriting 0x00000...
Enabling the A20 gate is one of the first things the boot loader does -
way before setting up the page tables.
Bye,
Axel.
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