In message 200705231258.45889.rui.sousa@laposte.net you wrote:
To support the flash one of our boards (no integrated in U-Boot) I need to implement something similar to Linux MTD complex mappings option in the CFI driver. In my case I have a NOR flash chip with an address line connected to a GPIO pin. The GPIO pin needs to be set correctly at each access to the flash.
I guess you lose... You probably can tweak U-Boot into thinking these are different flash banks, but that's about all.
Is someone else already working on a solution?
Not that I know of.
Would such a feature have a chance of being integrated in U-boot?
If a clean implementation was possible, yes, definitely. But I cannot see how this could be done. We don;t have a driver level to access raw memory.
Unfortunately this only takes care of writting operations. Support for read
That's the main problem.
would mean further extensive modifications (introduce some flash_read() function and use it from cp, md, jffs2, ... commands).
And here it all breaks down. You cannot do this without messing with lots of code.
The best you can probably do is provide a "bank switching" command to select one of your banks.
Best regards,
Wolfgang Denk