OLIMEX© 2018
A20-OLinuXino-MICRO user's manual
How to purchase?
You can purchase directly from our online shop or from any of our distributors. List of confirmed
Olimex LTD distributors and resellers:
https://www.olimex.com/Distributors
for more info.
8.4 Frequently asked questions (FAQ)
Q: I power my board, it shows a logo and then nothing happens.
A: This might be due to a number of reasons but it is recommended to try the following:
1. Download latest official image from our wiki (either Android or Debian; either for SD card or
flash memory), and upload it to the flash or to an SD card again. There are instructions how to do it
in the other questions below. Try if the board works now.
2. Check if your external power supply fits the voltage requirements and if it provides enough
current. Try with different and more powerful power supply.
3. Check the USB hub you are using, plug the USB cable directly to the back of your personal
computer, check the USB cable.
4. The board might enter sleep mode very fast (especially if the Android was turned off without the
“Quick Boot” mode being ticked on). Try pressing or holding down the PWR_BUT for a couple of
seconds to wake it up.
Q: How do I write the Linux image to a micro SD card to use with my A20 board?
A: In order to prepare a Linux card under Windows use a free software for writing SD card images
like “Etcher” or “Win32DiskImager”.
Under Linux you can use “dd” to download the image to an SD card - for example, an image with
file name "debian_2g.img" would be downloaded to the SD card connected to a Linux machine
using one of the following commands:
# dd bs=4M oflag=sync if=debian_2g.img of=/dev/sdX
or
# cp debian_2g.img /dev/sdX
where X is the uSD card.
The tips above can also be used to prepare a microSD card with an Android image, suitable for a
microSD card.
Page 53 of 56