Toolchain and Embedded Distributions: Difference between revisions
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== [[Toolchain Overlay File]] == | == [[Toolchain Overlay File]] == | ||
Because Xtensa is a configurable and extensible processor architecture that allows to define additional registers and instructions, the toolchain is the main software component that usually needs to be adapted for a specific Xtensa processor configuration. Tensilica provides a small set of configuration files in form of an ''overlay'' that | Because Xtensa is a configurable and extensible processor architecture that allows to define additional registers and instructions, the toolchain is the main software component that usually needs to be adapted for a specific Xtensa processor configuration. Tensilica provides a small set of configuration files in form of an ''overlay'' that replace the version in the toolchain sources. The [[Toolchain Overlay File]] is a version of that ''overlay'' provided by Tensilica with a specific format required for crosstool-NG and buildroot. A script to convert the ''overlay'' provided by Tensilica can be found under [[Toolchain Overlay File]] | ||
== Start from scratch with FSF/OSS sources == | == Start from scratch with FSF/OSS sources == | ||
Revision as of 20:58, 17 March 2013
Toolchain Overlay File
Because Xtensa is a configurable and extensible processor architecture that allows to define additional registers and instructions, the toolchain is the main software component that usually needs to be adapted for a specific Xtensa processor configuration. Tensilica provides a small set of configuration files in form of an overlay that replace the version in the toolchain sources. The Toolchain Overlay File is a version of that overlay provided by Tensilica with a specific format required for crosstool-NG and buildroot. A script to convert the overlay provided by Tensilica can be found under Toolchain Overlay File
Start from scratch with FSF/OSS sources
Creating a toolchain and bootable root file system starting from sources is certainly the most challenging approach. It usually requires additional patches and sometimes matching versions of sources. While support for Xtensa is integrated in most toolchain tools, they must be patches for a specific Xtensa processor configuration. The overlay file, typically provided by Tensilica, includes the necessary set of configuration files together with information that explains the process to patch the toolchain sources.
crosstool-NG (build instructions for Xtensa)
crosstool-NG (http://crosstool-ng.org/) provides a system to build a complete toolchain. It supports various C-libraries (Multilib, uClibc, glibc, and eglibc), but can also be used to build a 'bare' toolchain. The current version does not yet support Xtensa as a target, but a development version can be retrieved from the local GIT repositories. Patching the toolchain and other software, that is architecture specific, is fully automated using the Toolchain Overlay File. More information for building a toolchain for Xtensa using crosstool-NG can be found here.
BuildRoot (build instructions for Xtensa)
Buildroot is a set of Makefiles and patches that makes it easy to generate a cross-compilation toolchain and root file system for your target Linux system. The Xtensa architecture is fully supported in the official tree, including support for specific processor configuration using the Toolchain Overlay File. For build instructions, see Buildroot.