Hi, with kernels newer than 3.16.1 (provided by Acmessystems) the Arietta G25 (http://www.acmesystems.it/arietta) has problems to be successfully powered off or (boolean "EXOR" ;) reboot.
With the new 3.18.0 mainline kernel it is possible to successfully shutdown (power off) and reboot the system. For the kernel configuration the following options have to be set CONFIG_POWER_RESET CONFIG_POWER_RESET_AT91_RESET The following option needs to be disabled: CONFIG_POWER_RESET_AT91_POWEROFF Have fun! Best regards, Meino