UM0844 datasheet(30/43 Pages) STMICROELECTRONICS

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Working at application level (userland)

UM0844

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Doc ID 16544 Rev 3

4.3.2

Testing a simple application example

In order to check the STLinux installation and start to learn the environment, it is useful to

write and test a simple user-space application. For example:

Right click in the "Project Explorer" window and select "New -> Project" from the menu

Select your programming language (for the purpose of this tutorial we use C)

Insert your Project name in "Project name" field ("Hello")

Select "Hello World ANSI C Project" as Project Type

Select "ARM926 Linux GCC" as toolchain

Click on "Finish"

In the Project Explorer you now see the newly created "Hello" project, with includes and a

source file in the "src" subdirectory. To open the src/Hello.c file double-click on it. It is now

ready to be modified.

4.3.3

Building a project

To build your project completely with the provided cross-compilation toolchain you can do

one of the following:

●

From the STWorkbench menu, select "Project -> Build Project"

- Or -

●

In the Project Explorer window, right click on your project name, then select "Build

Project"

Build messages are displayed in the "Console" tab at the bottom of the screen.

4.4

Userland packages

The general SPEAr Linux Support Package (LSP2.3) comes with a set of user-space

packages prebuilt for the ARM target. This set includes programs and libraries for:

●

Graphics: for example, X Server, SDL, Cairo, DirectFB, GTK+, Qt Embedded

●

Programming language runtimes: for example, micro Perl

●

Connectivity: for example, usblib, Bluetooth (Bluez)

●

Multimedia frameworks: for example, ALSA, GStreamer

●

Database: for example, sqlite

●

Benchmarking tools: for example, IOZONE, netperf

Some of these packages are not supported on SPEAr evaluation boards yet, especially the

ones requiring specific hardware for audio, video, wireless connectivity.

4.5

Rebuilding the root filesystem

The default root filesystem provided as pre-flashed on all SPEAr evaluation boards, as well

as binary image on ST Web site for upgrades, is built for serial NOR Flash and formatted

according to JFFS2 structure.

In order to rebuild this configuration, the procedure to be run on Linux host PC is as follows:

$ mkfs.jffs2 -n -p -l -s 0x200 -e 0x10000 -r $BUSYBOX/_install/ -o

rootfs_nor.img

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