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>Having looked at memcreg.h a bit more, it seems there aren't all that many
>bits spare in the page table entries.  With 4 KB pages, there are enough
>for 256 physical pages (1 MB).  With 8 KB pages, 512 (4 MB), with 16 KB
>pages, 1024 (16 MB) and with 32 KB pages, 2048 (64 MB).  

I don't really understand this.  Presumably this is some NetBSD thing, rather 
than being specific to MEMC?

>The last of those
>would overflow the space for physically-mapped pages, though I suppose
>that need not be a problem if the OS isn't confused by it.

Yeah.  I think Linux depends on having all RAM physically mapped; I have no 
idea about NetBSD.

p.



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