Notes from inside the Kronos - Part I: The security IC

The AT88SC0204CA is used for at least the following purposes:

1. It defines the Kronos' Public ID
2. It holds (part of) the AES keys that are used to encrypt the synthesizer software
3. It is used to authenticate EXs

The chip is connected to the OMAP via I2C and can be accessed by the Linux kernel via the USB connection between OMAP and PC. OmapNKS4Module.ko implements functions to access the security IC.