HCL:A20-OLinuXino-MICRO

The A20-OLinuXino-MICRO is a Allwinner A20 development board. It is manufactured and sold by Olimex.

Technical Data

• Allwinner A20 dual core Cortex-A7 processor, each core typically running at 1GHz and dual-core Mali 400 GPU
• 1GB DDR3 RAM memory
• SATA connector with 5V SATA power jack
• HDMI connector with FullHD support (1080p)
• 2 x USB High-speed host with power control and current limiter
• 100MBit native Ethernet
• VGA output on 6-pin 1.25mm (0.05") step connector
• MicroSD card connector
• Audio headphones output and Microphone input on connector
• 4GiB NAND Flash version available
• LiPo backup battery support, LCD interface, 160 GPIOs with I2C, SPI, ... (and what else the A20 supports)
• Full board documentation available

Writing a disk image to the SD card

1. Download the image you want (Leap is stable, Tumbleweed is rolling) from here:
   

   Tumbleweed

   JeOS image E20 image XFCE image LXQT image GNOME image KDE image X11 image

   If the direct links above do not work for you, please check the general download directory for the images.

2. As root extract the image onto your SD card (replace sdX with the device name of your SD card).
   WARNING: all previous data on the SD card will be lost. Check first if the device you have selected is really your SD card!

    xzcat [image].raw.xz | dd bs=4M of=/dev/sdX iflag=fullblock oflag=direct; sync

3. Insert the SD card with the openSUSE image into your board.
4. Connect the board to your PC via serial port (optional, but helpful for debugging; USB-TTL serial cable needed).
5. Connect the board to your monitor (via DVI/HDMI, optional).
6. Power on the board.
7. Walk through the first boot steps.
8. Ethernet is configured to request an IP via DHCP, check your DHCP server for the board IP if used.
9. Have a lot of fun...

Default login is root:linux, works on serial console, via ssh, GUI.

LCD Display Support

For detailed instructions see HCL:A10-OLinuXino-LIME.
The display parameter details are:

set "ARM architecture --> LCD panel timing details" to the display properties
set "ARM architecture --> LCD panel power enable pin" to PH8
set "ARM architecture --> LCD panel backlight enable pin" to PH7
set "ARM architecture --> LCD panel backlight pwm pin" to PB2

Framebuffer settings:

dtc -I dtb -O dts /boot/dtb/sun7i-a20-olinuxino-micro.dtb > sun7i-a20-olinuxino-micro.dts

...
chosen {
...
  framebuffer@1 {
    compatible = "allwinner,simple-framebuffer", "simple-framebuffer";
    allwinner,pipeline = "de_be0-lcd0";
    clocks = <0x2 0x1 0x3 0x24 0x3 0x2b>;
    status = "disabled";
  };
}
...

dtc -I dts -O dtb sun7i-a20-olinuxino-micro.dts > /boot/dtb/sun7i-a20-olinuxino-micro.dtb

The A20 has no touchscreen controller built in.

See HCL:A10-OLinuXino-LIME page for battery and power supply support.