Olimex Open Source Hardware Embedded ARM Linux Single board computer with dual core, dual GPU ALLWINNER A20 CORTEX-A7 A2 A20-OLinuXino-MICRO 数据表
产品代码
A20-OLinuXino-MICRO
OLIMEX© 2013
A20-OLinuXino-MICRO user's manual
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.
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.
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.
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.
than others. This is perfectly normal for some chips – for instance – voltage regulators and the main
processor.
2.4 Button functions and NAND image restore in Android
The bellow three buttons usually are supported under both Android and Debian:
PWR_BUT – used to perform software turn off, software turn on; used to turn on board when
powered by battery – has to be held down for at least 5 seconds to perform each action
RESET – used for hardware reset of the board – it is not recommended
RECOVERY – used to wake up the board from sleep
powered by battery – has to be held down for at least 5 seconds to perform each action
RESET – used for hardware reset of the board – it is not recommended
RECOVERY – used to wake up the board from sleep
The following buttons represent functions in the Android (it is possible that not all Android
applications take advantage of the buttons, in such case the button would serve no purpose for that
application):
applications take advantage of the buttons, in such case the button would serve no purpose for that
application):
VOL+ – increases the volume
VOL- – lowers the volume
MENU – brings up the main menu
SEARCH – brings up search feature
HOME – shows the home screen; note that HOME is also used to enter bootloader mode for
firmware update
ESC – used to navigate away of a menu
ENTER – to select a choice
VOL- – lowers the volume
MENU – brings up the main menu
SEARCH – brings up search feature
HOME – shows the home screen; note that HOME is also used to enter bootloader mode for
firmware update
ESC – used to navigate away of a menu
ENTER – to select a choice
It is not recommended to disconnect the power supply (either the USB or the power jack) before
turning off the Android from the either the menus or by holding PWR_BUT system written on the
NAND.
turning off the Android from the either the menus or by holding PWR_BUT system written on the
NAND.
2.5 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.
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).
OTG communication (NAND firmware repair/update).
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