Firmware
This article is about the different parts of the iPod's firmware. There is also a very basic analysis of the firmware headers. If you are trying to get a copy of the firmware files, please see Dumping firmware and Extracting firmware. NOTE: Please excuse the chaotic layout of this article. It is not very comprehensive, but it's still useful.
Nano 2G
osos
This is the main firmware image of the iPod. This part has been encrypted ever since the iPod Nano 2G.
aupd
Here is a comparison between the different aupd partitions of firmware version in the iPod Nano 2G:
rsrc
This is the resource filesystem of the iPod firmware. It is unencrypted and of not much use to this project.
Nano 3G
The Nano 3G has the same osos, aupd, and rsrc sections as the Nano 2G, but it also has an added hash section. The hash section is populated with 0x1800 bytes of 0xFF.
Classic 1G (6G)
The Classic 1G has the same firmware structure as the 3G. This makes sense because they were released at the same time.
Nano 4G
The Nano 4G kept the osos and aupd sections, but it no longer has the aupd section. Instead, seven new sections were added. We assume that these have the following functions, the question mark means that we are not completely sure:
- appl - bootlogo?
- bdhw - bad hardware?
- bdsw - bad software?
- chrg - sleep, but charging?
- diag - diag mode
- disk - disk mode
- lbat - low battery logo?
Helpful pages
http://home.gna.org/linux4nano/download/crypto_synth-1.0.pdf
