OLIMEX A20-SOM [12/41] Expanding the debian file system space

2.6 Expanding the Debian file system space

The provided official Debian images have constant size but you may want to use a bigger microSD

card.

In case you don't know how to expand the file system space you can use the built-in shell script for

this task. This way you can take advantage of the whole volume of your microSD card.

Type in the command prompt:

./resize_sd.sh /dev/mmcblk0 1

After that you need to reboot the board with:

reboot

You can find the name given to the microSD card and its partition using:

fdisk -l

2.7 Changing the default image resolution

The method for changing the output video resolutions varies whether you are using Android or

Debian.

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 users, we

have provided a shell script that can be executed in order to set preferred video output and

resolution.

For Android that you boot from the NAND memory you would need an image suitable for the

specific resolution. Download locations to such images might be found at the wiki article for the

A20 board here: https://www.olimex.com/wiki/A20-SOM.

For Linux Debian you would need to execute a shell script to be able to change the resolution. It is

very good idea to use a serial cable for connection to the board from a personal computer since in

this case you are not dependent on the current video output resolution (a cable like USB-SERIAL-

CABLE-F). When the board boots type:

./change_display*

./change_display_a20_SOM.sh

It looks like this:

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