On Saturday 15 December 2001 21:56, Michael K. Sanders wrote:
> Frank van der Linden writes:
> >It's called PAE (Physical Address Extensions), allowing for 36-bit
> >physical addresses. It's all hidden in the page table, which has
> >entried widened to 64 bits, so that the 36 bits of physical address
> >fit in there. Virtual address space is still 32 bits wide.
>
> Does NetBSD support this?  The Intel SCB2 board I mentioned recently
> that fails to boot with 4GB is one of these.

Is 32bit PCI memory space still mapped to the first 4GB in such case? I would 
think that it should, for compatibility reasons and convenience.

So either some of these 4GB RAM is mapped above 4GB in physical address space 
or is masked by mapped PCI devices.

How is it done? Could someone shed some light on this?


Greetings,


	Witold J. Wnuk