Embedded Linux on ARM Devices
We got some really nice Hardware from a friendly company, and now we adapt it to our needs:
Have a look at: http://www.micromint.com/index.php/SBC/electrum100.html
It shall be used for measurement and control applications, using a wired link (UDP) or a wireless link (modem, connected via serial- TTL).
You can connect all kind of sensor:
etc using analog (12 bit) or digital inputs.
Because we want to use C++ with the QT library to write the code for this little board, we first need a cross-compiler (a toolchain) for this.
Installing the CodeSourcery toolchain
The following description is based on the tutorial, that I found on the following website: http://holtham.org/content/establishing-build-environment-cross-compiling-embedded-qt-applications-ubuntu
First we download the toolchain, move it to /opt and rename it to CodeSourcery:
cd ~ mkdir Downloads cd Downloads wget https://sourcery.mentor.com/sgpp/lite/arm/portal/package8739/public/arm-none-linux-gnueabi/arm-2011.03-41-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2 sudo mv arm-2011.03-41-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2 /opt cd /opt sudo tar --bzip2 -xvf arm-2011.03-41-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2 sudo mv "arm-2011.03" CodeSourcery sudo rm arm-2011.03-41-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2
Add the path /CodeSourcery/bin to the search path and reboot:
cd /etc sudo joe environment Add the following path to the first line: :/opt/CodeSourcery/bin On my computer, it than looks like this: PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/opt/CodeSourcery/bin" sudo init 6
Check, if the correct compiler can now be found. Open a terminal and enter:
arm-none-linux-gnueabi-g++ (Sourcery G++ Lite 2011.03-41) 4.5.2 Copyright (C) 2010 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
On the target computer there must be a directory "/sysroot" be installed. To create it, type:
cd ~ mkdir 00Software cp -r /opt/CodeSourcery/arm-none-linux-gnueabi/libc . mv libc sysroot
This sysroot directory has now a size of 1.3 GB. To reduce the size, you can do:
cd sysroot rm -r armv4t rm -r thumb2
Now the size is only 459 MB. To further reduce the size, delete all locales, that you don't need, from the folder sysroot/usr/lib/locale. If I delete all but the english locales, the size is reduced to 79 MB.
Now you can pack the sysroot folder into a .tar.gz archive, copy it to the target, move it to the root folder and unpack it there.
You should have a working cross-compiling toolchain now.
Advantages compared to embeddian: You can independently upgrade the toolchain and the operation system. Disadvantage: Higher use of flash-memory on the target device.
Continue with: QT on embedded Linux
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