Compact31s

'Compact31s Card Size Board' The Compact31s Card Size Board is based on ALLWINNER A31S Quad-core ARM Cortex A7@1GHz, and running Linux3.30 and Android4.4.

Linux on Allwinner SoC resources[edit] 

Linux Sunxi Wiki

About the ALLWINNER A31S

The Allwinner A31S processor is a quad-core phablet processor designed for the phablet market. The phablet is a product category that combines the functionalities of a smartphone with that of a tablet, and its size usually falls somewhere in between a smartphone and a tablet. The A31S processor is based on quad-core Cortex-A7 CPU, which is the most power efficient porcssor developed by ARM. It also comes with SGX544MP2 CPU with eight logic core to enable powerful 3D computing capability as well as excellent UI experience, especially when it comes to the smoothness of screen with large size. More inportantly,A31s processor integrates a robust Audio Codec that includes two sets of I2S/PCM interface for Baseband and Bluetooth, two integrated differential analog MIC for headset and phone, as well as a digital MIC. It is capable of 3G,2G,LTE,WiFi,Bluetooth,FM,GPS,AGPS,NFC and other voice and data wireless transmission technology with a minimum of external components. Additionaly, A31S processor provides a wide range of peripheral interface. For example, it integrates display interfaces such as HDMI,RGB LCD and LVDS,image input interface such as CSI, and data interfaces such as USB OTG,USB EHCI/OHCI,SDC,SPI,UART,etc. When it comes to power efficiency, AXP221s is specially designed for the power optimization of A31s.A31s processor also supports a smart Power Consumption Management System to dynamically adjust CPU frequency and voltage,support DRAM Dynamic Frequency Scaling technology to dynamically adjust DRAM frequency based on bandwidth requirements, and also supports Super Standby Mode to lower the system power consumption during system standby.