jeff on hackaday.io has designed a board for an Atmel microcontroller with the ARM Cortext M7 core:

se7eduino

Small Atmel SAM S70 based dev board.  Similar to the Arduino Due, except super-mega-turbocharge

The board features:

• 300 MHz ARM Cortex-M7
• 2MB flash
• 384k RAM
• 480 Mbps high-speed USB
• MicroSD card
• Battery Charger

jaw has shared the project on GitHub:

se7eduino/2015-05