PHDK

== Pentax Hacker Development Kit

A CHDK (the [[http://chdk.wikia.com/wiki/CHDK|Canon Hacker Development Kit]]) for Pentax Cameras...

== Status

Biggest problems for creating a hacked firmware are:

• Need for experienced reverse engineers
• Cost of the required tools such as IDA Pro
• The FP instruction set

Progress so far:

• Decrypted the firmware
• Found the CPU base address (0xA0000000 and that it's a Cortex M4)
• A lot of reverse engineering. Large parts found including memory allocation functions, displaying text on screen etc
• Found all the debug processing code
• Found the firmware decryption routine

What is needed (so far):

• Service manual for a K30 (or even a similar model). This would be really useful in understanding how all the debug functionality actually works
• Datasheet for the MB91696AM or even a very similar ARM based CPU
• Source code for the Pentax-hack firmware decryption tool - I want to encrypt my own firmware
• Someone to tell me the offsets to icons/text images in the binary. This would rapidly increase the amount of functions I can find!

How you can help:

• I will need testers. Be warned there is a small chance of bricking the camera...
• I need people to help with the dissasembly. You'll need a copy of IDA Pro (or maybe notepad - see below).
• Anyone know anyone at Pentax / Ricoh. I'm considering dropping their marketing team an email.
• Don't request features. At the moment there is only one feature - get custom code running on the device.
• Don't request other cameras. I own a K30 and thats what i'm working on.

== Links

• Forum Thread at pentaxforums.com: [[http://www.pentaxforums.com/forums/6-pentax-dslr-discussion/250555-resurrecting-pentax-firmware-hacking.html|Resurrecting Pentax firmware hacking]]
• PDF "Hacking the Pentax K30" by Shodan: [[https://www.dropbox.com/s/ogez7sb4b0cw92g/hacking_pentax_k30.pdf|hacking_pentax_k30.pdf]]
• Related Github repository: [[https://github.com/i-am-shodan/PentaxFirmwareTool|Pentax Firmware tool for the K30]]
• Wiki: [[http://phdk.wikia.com/wiki/Pentax_Hacker_Development_Kit_Wiki|Pentax Hacker Development Kit Wiki]]
• Foreign website with many information, but no longer maintained: [[http://www.pentax-hack.info/|pentax-hack.info]]