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Getting Started with Cubieboard by Olliver M. Schinagl

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Appendix C. The FEX Configuration File

Many systems have a way of configuring themselves, be it software or, in this case, hardware. Allwinner-based hardware is no different; there are some bits and pieces that do require configuring, such as GPIO pins. A chip cannot configure itself; that is, it cannot parse a configuration file and configure itself. The actual configuration of the chip is done by the various drivers. The procedure is illustrated in the following sections.

Initial boot up

The chip starts in a hardwired way, where certain components are preprogrammed to be active on specific pins. Because of this, the chip can boot from various boot media, as mentioned in Chapter 3, Installing an Operating System, and load the bootloader. The bootloader ...

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