Ipod Flash

Hardware

The ipods supported by Rockbox have the following flash chips (based on information in http://ipodlinux.org/Generations:

Ipod Model	Flash chip	Capacity	More Info
3rd Generation	Sharp LH28F800BGHB?-TTL90	1MB
4th Generation
Color/Photo	SST SST39VF800A?	1MB	Datasheet
Mini 1st Gen	SST SST39VF800A?	1MB	Datasheet
Mini 2nd Gen
Nano	SST SST39WF400A?*	512KB*	Datasheet
Video	SST SST39VF800A?	1MB	Datasheet

* Various websites which have disassembled the Nano claim it contains the SST39WF400A? flash chip. However, this is only 512KB, and dumping the flash from within Rockbox shows that there is 1MB of data... See also this picture.

Apple's flash code

The Apple code in flash contains the first-stage bootloader, plus two self-contained "application images" - diskmode and diagmode. These are copied to RAM by the bootloader and then executed when the appropriate key combination is detected at boottime by the bootloader.

The contents of the flash can be dumped to disk using the "Dump ROM contents" entry in the Rockbox debug menu. This will create a file in the root called internal_rom_000000-0FFFFF.bin

The flashsplit program can be used to extract the diskmode and diagmode images from such a dump.