Already it is possible to see and write in NAND memory from linux, I have left a small guide (in Spanish, use google translate) to be able to experiment with its use:
Http://surfero.blogspot.com.es/2017/08/orange-pi-iot-2g-trabajar-con-la.html
At the moment it has not been able to make linux boot from nand but mount it. Everything has been made possible thanks to the work of the gitub aib user (https://github.com/aib)
Dmesg:
[ 0.692321] NAND device: Manufacturer ID: 0x98, Chip ID: 0xac (Toshiba TC58NYG2S0H 4G 1.8V 8-bit), 512MiB, page size: 4096, OOB size: 256
fdisk -l:
Disk /dev/mtdblock1: 8 MiB, 8388608 bytes, 16384 sectors
.........
..........
Disk /dev/mtdblock4: 280 MiB, 293601280 bytes, 573440 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00000000