Highmem on PPC?

[benh at kernel.crashing.org]

>What's the current state of highmem on the G4?  Does it work, not
>work, kinda work, only work on UP... ?
>
>I hope to have a dual 7450 G4 with 1 GB RAM within a week, at which
>point I'll be able to work on highmem seriously.

It's supposed to work. However, I'm having reports of dual 7450 with
1G or 1.5G of RAM locking up, I haven't been able to track those down.

Is this an Apple machine ? The 7450 has a bug that prevents use on
SMP with HW hash table walk. Apple is supposed to implement a HW
workaround for this on their machines, but if it's not an Apple machine,
then you may have to implement software TLB load.

Ben.


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