RE: [2/3] Set compatibility flag for 4GB zone on IA64

[Luck, Tony]

>Luck, Tony wrote:
>> ia64 isn't all that homogeneous.  SGI systems stuff *all* memory
>> into the DMA zone as their I/O devices have no 32-bit limits (just
>> as well really as there is no memory below 4G on an Altix!).
>
>SGI machines support random PCI cards, right?  If so, you 
>cannot presume 
>I/O devices have no 32-bit limits.

No, SGI machines don't support random PCI cards.  The lowest
possible physical address in an Altix is 192GB.  Cards that
can only DMA to addresses below 4G aren't going to be very
useful, are they?

-Tony
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