Zoe Romano posted a new blog entry on Arduino.cc site, about Intel releasing the source code to the Arduino 101 firmware.
[…] We’re very happy to announce that the source code of the real-time operating system (RTOS) powering the Arduino 101 and Genuino 101 is now available for hacking and study purposes. The package contains the complete BSP (Board Support Package) for the Curie processor on the 101. It allows you to compile and modify the core OS and the firmware to manage updates and the bootloader. (Be careful with this one since flashing the wrong bootloader could brick your board and require a JTAG programmer to unbrick it). The firmware runs on the x86 chip inside the Curie module and communicates with the ARC core (which runs your Arduino sketches) using these callbacks. Right now, the x86 core takes care of handling Bluetooth Low Energy (BLE) and USB communication, offloading the ARC core. You can use the code which implements these functionalities as a starting point for your custom extra features. […]
https://downloadcenter.intel.com/download/25832
https://github.com/01org/corelibs-arduino101
http://forum.arduino.cc/index.php?board=103.0
Firmware Security 