Storage
A very basic Linux system can work within 4 MB of storage, but usually more is needed.
- Flash storage is supported, both NAND and NOR flash, with specific filesystems
- Block storage including SD/MMC cards and eMMC is supported
http://kelvin820.pixnet.net/blog/post/12793476-%5B%E8%BD%89%E8%B2%BC%5Dnand-%E8%88%87-nor-flash