By Pierre Ficheux

ISBN-10: 2212116748

ISBN-13: 9782212116748

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L’adaptation se situera principalement au niveau du développement de pilotes de périphériques et de l’optimisation du système en taille ou en performances. Dans le second cas, les contraintes matérielles nécessiteront l’utilisation de composants spécialisés, soit un logiciel spécifique, soit un système d’exploitation dit temps réel (Real Time Operating System ou RTOS). Les définitions et comparaisons des deux types de systèmes seront approfondies dans la section suivante. Le domaine de l’équipement grand public avait échappé aux systèmes embarqués d’abord pour des raisons de coût du matériel.

Com) qui a récemment modifié son nom en raison de son virage vers Linux avec le développement de BlueCat. C’est un système temps réel conforme à la norme Posix. Nucleus Nucleus est développé par la société Accelerated Technology Inc. com). C’est un noyau temps réel qui inclut une couche TCP/IP, une interface graphique (Graphix) ainsi qu’un navigateur web (WebBrowse) et un serveur HTTP (WebServ). Il est livré avec les sources et il n’y pas de royalties à payer pour la redistribution. 33 34 Systèmes embarqués, généralités PREMIÈRE PARTIE eCos Acronyme pour Embeddable Configurable Operating System, eCos fut initialement développé par la société Cygnus, figure emblématique et précurseur de l’Open Source professionnel, acquise ensuite par la société Red Hat Software.

Dans le cas des systèmes embarqués, l’exemple classique de contrainte inhérente à la GPL est l’impossibilité de mixer le code GPL original du noyau Linux avec du code propriétaire. Si vous développez un pilote de périphérique à partir du source d’un pilote existant (donc sous GPL), la licence vous oblige à diffuser le source du pilote. Même si vous écrivez entièrement un pilote de périphérique, la licence GPL vous oblige à diffuser son source si vous désirez le lier statiquement au noyau original sous GPL.

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Linux embarqué (Broché) by Pierre Ficheux


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