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= Configure Mux =
Mux options are vast, at the beginning can be difficult and tedious change some default configurations. Use Before configure mux, use the following tips to configure mux without avoid problems:
*Mux can connect multiple connectors at the same peripheral, this improper use can damage the processor. Make sure to disable old connector configuration before use new oneBefore configure mux, revise that this peripheral is not used in other pads. See schematics or [[Connectors_Summary|connectors summary]] for more information.
*Some peripherals are only available if you place or replace some resistances. See schematics for more information.<br>
*Some connectors share multiples peripheralslike OMAP, WIFI/BT combo, etc. You should disable unused peripherals to avoid interferences. For example: if you want to control WIFI module via J990 disable OMAP or if you want use [[How_to_set_up_UART2_in_J990|UART2 at j990 ]] disable Bluetooth.<br>See schematics or [[Connectors_Summary|connectors summary]] for more information.
There are three ways to configure mux in IGEP Boards based in OMAP35xx and DM37xx:<br>
*Editing OS User Space. this This mode has a issue, when your system reboot or shutdown you will need to configure again. [[How to set up UART2 in J990#First_way|Example]]. *Using kernel buddies. This way is not avaliable in some cases. [[How to set up UART2 in J990#Second_way|Example]]. and [[Linux Kernel 2.6.37.y#Kernel_Parameters|Buddies buddies parametres]].<br>
*Editing and compile kernel sources. [[How to set up UART2 in J990#Third_way|Example]].<br>
