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Debian (deb) packages are used for application and library management on Debian based Linux systems.

In order to carry out cross development, toolchain packages for cross development and library packages for the target architecture which have been converted for cross development use must be installed on the work PC.

On Debian based Linux systems there are two ARM architectures: arm and armel. The difference between these two lies in the ABI (Application Binary Interface), with the arm architecture using OABI, and the armel architecture using EABI.

As EABI is the standard ABI on the Armadillo-400 Series, Debian armel packages must be installed.

The cross development environment packages are stored on the included DVD under the cross-dev/deb/ directory. For development with the Armadillo-400 Series, please install the ARM EABI cross development packages in the armel directory.

The install must be carried out as a root user. The deb packages are installed by executing the command shown in 図4.1「Install Command」.

[PC ~]$ sudo dpkg --install *.deb

	sudo is used to execute the specified command as a different user. The above command line executes the dpkg command as the root user. A password is requested after executing the sudo command. This is the password of the user executing the command, and not the root password.

	If a cross development environment for the same target architecture has been previously installed in the Linux environment, please make sure to uninstall this existing environment before installing the new cross development environment.

Atmark-Dist is the default distribution for Armadillo. The packages listed in 表4.1「List of Packages Required for Atmark-Dist Builds」 must be installed on the work PC in order to build Atmark-Dist.

The currently installed version can be displayed by specifying the package name when executing the command shown in 図4.2「Installed Version Display Command」.

--list is an option to dpkg used to display package information. The package name pattern for the package to be displayed is specified in place of package-name-pattern.

[PC ~]$ dpkg --list [package-name-pattern]

When building applications or libraries not included in Atmark-Dist, library packages that are neither available in the included DVD or from the download site may be required. The following is an introduction on how to create and install the required cross development library packages.

First, the library package on which the cross development package will be based on must be acquired. The package architecture must match the target and the Debian distribution version should match that of the development environment. For the Armadillo-400 Series, the architecture is armel and the Debian distribution version is lenny (the stable version as at March, 2010).

For example, for the libjpeg62 library the package name will be libjpeg62_[version]_armel.deb.

Debian packages can be searched for and downloaded from the Debian Packages site^[9].

Once the library package has been obtained, it is then converted for cross development use with the dpkg-cross command.

[PC ~]$ dpkg-cross --build --arch armel libjpeg62_[version]_armel.deb
[PC ~]$ ls
libjpeg62-armel-cross_[version]_all.deb libjpeg62_[version]_armel.deb

The created cross development library package is then installed.

[PC ~]$ sudo dpkg -i libjpeg62-armel-cross_[version]_all.deb

	If the dpkg-cross command is used in environments other than Debian Lenny, there may be times when an installable package cannot be created.

By using apt-cross, all of the above steps can be performed with just one command.

[PC ~]$ apt-cross --arch armel --suite lenny --install libjpeg62

The target architecture is specified after the --arch option, and the Debian distribution version after --suite. When --install is specified, apt-cross automatically installs the converted package. The package name is specified as the last parameter.