Hi
Not really, what you see above (the VM split) is in virtual address
space, while memory zone splits the RAM physical address into different
parts. For example, 0-16 MB is named as DMA zone because they are
adddressable for DMA operation.
I think we should not say 0-16 MB physical addresses are always DMA
zone. Rather, I think, we should say that the first 16MB of RAM always
constitutes the DMA Zone. Please CMIIW.
I think I am OK with that :) After all, I never did DMA programming, so
maybe you know better than me.
My confusion arises from this:
What would happen in a x86 machine with 2GB RAM, where the physical
addresses of RAM are from 1GB - 3GB. The 16MB DMA Zone will start from
physicall address 1 GB, right?
Never see such a condition, but let's say we do really have such
configuration, then I shall answer it will start from physical address
1GB to 1GB+ 16MB or whatever addressable for DMA operation. Maybe Rik or
the other VM man can jump in here...
regards,
Mulyadi
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