Comment # 5 on bug 928685 from Volker Kuhlmann

/usr/src/linux-3.19.4-1/Documentation/devicetree/bindings/mtd/sunxi-nand.txt
/usr/src/linux-3.19.4-1/drivers/mtd/nand/sunxi_nand.c
Give no hint about the device numbers. Perhaps they're generic to nand.

Perhaps there is supposed to be a device tree description:
  Examples:
  nfc: nand@01c03000 {

# strings /boot/dtb/sun4i-a10-cubieboard.dtb |grep -i nand
ahb_nand
nand

Perhaps this is missing and the driver can't find the HW?

I can't yet find any syslog output re nand modules either. I'm a bit stuck, but
will keep looking.