Scott Wood <scottw...@freescale.com> wrote on 2011/01/18 21:24:16: > On Tue, 18 Jan 2011 21:06:34 +0100 > Wolfgang Denk <w...@denx.de> wrote: > > > Dear Joakim Tjernlund, > > > > In message > > <of287114d8.013b6e51-onc125781c.00667dcd-c125781c.00673...@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?
It crashed and burned :) I never got to the details. > > > > > 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. I think it is harder that that. You probably need a tlb miss handler. > > 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. No, you only need gcc support for msingle-pic-base and some extra RAM to hold the GOT(about 8KB would do I think) while still in flash. Ah, you mean how to select which image to select? That is a small piece of SW that checks both images and chooses the valid one and jumps there. Jocke _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
