Modifications

=== Exigence fondamentales pour les nouvelles cartes d'extensions ===

=== Exigence fondamentales pour les nouvelles cartes d'extensions ===

If you are designing a new add-on board that takes advantage of the pins on the B+ GPIO header other than the original 26 then you must follow the basic requirements:

Il est nécessaire de suivre les conditions suivantes si vous désirez faire du hacking ou créer de nouvelles cartes {{underline|utilisant les nouvelles broches supplémentaires sur le GPIO du B+}} (de 27 à 40):

#  The header must cover the ID_SD and ID_SC pins and either a valid ID EEPROM must be used on these pins, OR the ID_SD pin must be shorted to GND (so the Pi can detect at least that a board is plugged in) and the ID_SC pin must be left unconnected. Do not use ID_SC and ID_SD pins for anything except an ID_EEPROM, or shorting ID_SD to GND on non-EEPROM boards.

#  Pour les cartes: Le connecteur doit inclure lles broches ID_SD et ID_SC et doit:

## soit utiliser un ID EEPROM valide sur ces broches

## soit raccorder ID_SD à la masse to GND (permet au Pi de savoir qu'il y a une carte branchée) et laisser la broche ID_SC déconnectée.<br />{{ambox-stop|text=Do not use ID_SC and ID_SD pins for anything except an ID_EEPROM, or shorting ID_SD to GND on non-EEPROM boards.}}

# If back-powering via the 5V GPIO header pins you must make sure that it is safe to do so even if the Pi 5V supply is also connected. Adding an ideal 'safety' diode identical to the one on B+ as per the relevant section of the design guide is the recommended way to do this.

# If back-powering via the 5V GPIO header pins you must make sure that it is safe to do so even if the Pi 5V supply is also connected. Adding an ideal 'safety' diode identical to the one on B+ as per the relevant section of the design guide is the recommended way to do this.

# The board must protect against old firmware accidentally driving GPIO6,14,16 at boot time if any of those pins are also driven by the board itself.

# The board must protect against old firmware accidentally driving GPIO6,14,16 at boot time if any of those pins are also driven by the board itself.