It appears that the nand flash controller support recently added to u-boot for the ppc400ep/epx only supports the use of a single nand chip. The nand flash controller supports up to four devices using chip selects 0-3. I am working on making two devices work right now for my use, but I would like to update the flash-controller support. I am open for comments on this.
What I think I need to do is add an #config CFG_440_USENANDCONTROLLER option and an entry into the nand_chip struct for holding the chip select numbers for each chip. Then in addition to configuring an array of nand bases {CFG_NAND_BASE} (which would all be the same address because it is the address of the nand controller), the chip selects are put in a configured array and put into the nand_chip nand struct. The read and write functions would then need to be updated to enable the right chip select in the nand controller config register too.
Comments? Suggestions? What am I missing?
-Jeff