NOR

NOR typically refers to the NOR flash chip the application processor boots from. The baseband also uses a NOR flash. (See Wikipedia's article about flash memory for background on NOR flash in general.)

How to Access
This can be accessed using a patched iBoot or a kernel hack. It can possibly be dumped using /dev/kmem

Hardware

 * iPhone -- some CFI compliant parallel NOR
 * iPhone 3G -- 1MB SPI NOR flash
 * iPod touch (3rd generation) and beyond -- The NOR is replaced with a dedicated partition of NAND