OLIMEX© 2014
A20-OLinuXino-MICRO user's manual
driving the board when using external display connected to the HDMI connector.
The typical consumption of A20-OLinuXino-MICRO-4GB is between 100mA and 320mA
depending on the current load and the power voltage applied.
If the board has entered power-down state you can bring it back without restart using the
PWR_BUT. The PWR_BUT is also used to start the board when powered from a Li-Po battery on
the battery connector.
Sometimes when starting Android it is possible the board to enter battery save mode even before
booting fully. Especially, if you have turned off the board without quick boot mode enabled. In this
case you should press the PWR_BUT for at least 5 seconds which would allow the board to start.
For the European customers we sell two power supply adapters, please check chapter 2.2. We also
sell USB OTG to USB type A cables if you lack such.
The default username/password combination for the default Linux image on the SD card (if
purchased) is: root/olimex.
Note that it is normal that when the board is powered some integrated circuits might appear hotter
than others. This is perfectly normal for some chips – for instance – voltage regulators and the main
processor.
2.4 Prebuilt software
The 4GB board-variant comes with Android 4.2.2 ready to use. The default settings of the software
are followed. The default image works with HDMI monitor and 7'' display.
How we have installed the software? Detailed information might be found in chapter
6.1.1 USB-
OTG communication (NAND firmware repair/update).
2.5 Changing the default image resolution
Depending on the display or the screen you want to use with the A10-OlinuXino-LIME, you might
need to apply software changes to the prebuilt Android or Linux image.
Generally, this means that you would need to edit the configuration file script.bin and edit the
settings inside. This file is usually located in Script.bin can't be opened in the binary format so you
would need to convert it to .fex file format first. There are ready-to-use tools that convert script.bin
<-> script.fex. Note that script.bin/fex contains configuration settings and definitions not only for
the video output but also for the pin descriptions and names; power setting and much more. If you
really want to modify and customize the default images (to change port functions, port names, to
disable specific peripherals) you would need to be able to edit the script files. Please refer to the
following web page for more information:
http://linux-sunxi.org/Fex_Guide
The typical OlinuXino user would not need to edit the files, however.
To ease the process of changing the resolution we have compiled a number of Android images
for the Android users (with hard-coded video output settings). Alternatively, for Debian Linux
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