Allwinner A20 User Manual download pdf (Page 36)

In Debian Linux you would need to start a start a shell script to change the built-in the image

resolution settings. Start it with ./change_display_A20_OLinuXino.sh and follow the instructions.

Please refer to chapter 2.5 “Changing the default image resolution” for more details.

6.15 Jumper description

Please note that most the jumpers on the board are SMT type. If you feel insecure of your

soldering/cutting technique it is better not to try to adjust the jumpers since it is possible to damage

the board.

Board jumpers

Jumper name Type Default position Function

NAND_E PTH UBOOT Changes the functionality of the

BOOT/REC button – when in UBOOT

position the button is used to

enter bootloader mode (to connect

via USB_OTG). When in REC

VPS- SMT Open Reserved for future use of

different types of NAND memories.

VPS+ SMT Open Reserved for future use of

different types of NAND memories.

6.16 Additional hardware components

The components below are mounted on OLinuXino but are not discussed above. They are listed

here for completeness:

Reset button – used to reset the board

2×2Gbytes (2×256Mb x 8 bit) DDR3 SDRAM – the exact memory used in the first revisions of

the board is Memphis H5TQ2G83CFR-H9C H5TQ2G63BFR

1×32Gbytes (4096Mb x 8 bit) NAND FLASH – the exact memory is hynix H27UBG8T2A

PWR_LED – turns on upon powering the board

LED1 – GPIO button

CHGLED – lights when charging a battery connected to the Li-Po battery connector.

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Allwinner A20 User Manual Page 36