In message 8r0FHjm57tdb.nQDcqRvm@mailout.dof.se you wrote:
=> OK, then tell me how to compare a 6 MB file in flash with a 6MB file in SDRAM when your SDRAM is 8 MB.
How are you doing it now? By doing it in chunks of a reasonable size.
It is not desirable to transfer 20,000 bits between CPU and dataflash when 100-200 are sufficient. Personally I would like everyone that did not bother to read and under stand the AT45 dataflash datasheets to do so before sending comments about how the internal implementation should look like.
Note that we don't discuss inplementation yet. We just try to define an API that fits into the rest of U-Boot. Once we have an agreement (or at least a decision), you are welcome to help implementing this as efficiently as possible.
Best regards,
Wolfgang Denk