On Tue, 18 Jan 2011 21:06:34 +0100 Wolfgang Denk wd@denx.de wrote:
Dear Joakim Tjernlund,
In message OF287114D8.013B6E51-ONC125781C.00667DCD-C125781C.00673260@transmode.se you wrote:
boards which I don't think is possible. I do think my approach comes closest though. I did try BATs but I didn't get very far.
What problems did you run into?
If we are talking about _all_ boards we have to keep a wider view. For example, on MPC8xx there are not BATs. Not to mention other architectures.
I don't see why MPC8xx's MMU couldn't be used for this, although it might be a tight fit if you want to get everything into the pinned TLB entries.
Should we be talking about all boards, if the only user of this so far is on hardware that can do it in a less-intrusive way?
Another thing to keep in mind is that Joakim's approach also won't work on all boards -- you need hardware that is capable of selecting from different entry points, where the entry address itself changes rather than flash banks being flipped around.
-Scott