Found this while browsing the web:
has a patch that adds support for a so called Disc On Chip inside an Asus MyPal A620 handheld. Looks very much like a NAND flash.
My first impression is that the patch won't integrate smoothly into the code base since it introduces parameter SIZE to peek/poke that is specific to the pxa2x0 bus driver. The logic for detecting whether SIZE was specified or not seems to be broken.
It might be worth a look however.