On 10/31/06, Franck Bui-Huu <[email protected]> wrote:
Miguel Ojeda wrote:
> Again: Please read LDD3. It explains it well. Read all the "Remapping
> RAM" chapter and you will understand what I've done, or just try to
> remap RAM yourself with remap_pfn_range.
Well, I'm trying to get an explanation here and here is what I get
from you:
MO > LDD3 states it must work like this. (Note: it doesn't explain
why though)
FBH > Weird I read the implementation of remap_pfn_range() and it
doesn't seem to have such restriction, I'm wondering how
things work...
MO > Again it's stated in LDD3, read again.
Do you really think you explain anything with such replies ?
Do you really think I have to explain anything with my replies? I was
just trying to help you telling where I found the answer.
Anyway, isn't it explained in LDD3? isn't it stated in LDD3? I think
it is (yep, not deeply, but enough: other books cover that points
better and a device driver programmer doesn't have to know about
implementations, right?). Sure, neither the book or I didn't know
about the VM_PFNMAP change, but that doesn't change that I was trying
to encourage you to read such chapter, the same way I found the answer
there.
Fortunately, Hugh Dickins gives a hint and it appears that the
restriction doesn't hold anymore.
> (I really tried it using
> different ways and I couldn't map it with remap_pfn_range, it returns
> you a place full with zeros, as LDD3 states).
I'm really wondering how did you test the thing... ;)
And I still say I tried it, many ways, using remap_pfn_range() and
other weird things also. Finally, I thought something was wrong, so I
read LDD3 and I found the explanation about why my code mmap couldn't
mmap RAM. Also, my area was full of zeros, as LDD3 states. So I read a
little further and I did what "Remapping RAM" explains.
Anything else?
Bye,
Miguel Ojeda
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