| ==================== |
| Device Tree |
| ==================== |
| |
| Overview |
| -------- |
| |
| Currently, NuttX supports parsing of FDT(Flattened Device Tree) using libfdt, a |
| utility library for reading and manipulating the binary format: |
| |
| https://github.com/dgibson/dtc/ |
| |
| Based on that, NuttX has implemented some common functions to get properties. |
| Device Tree support in NuttX will reduce the configuration of chips/boards, |
| it is not used in NuttX kernel framework yet. |
| |
| How to use |
| ----------- |
| |
| 1. Enable Device Tree and libfdt |
| |
| Enable the Kconfig settings: |
| |
| .. code-block:: console |
| |
| CONFIG_DEVICE_TREE=y /* Enable Device Tree */ |
| CONFIG_LIBFDT=y /* Enable utility library */ |
| |
| 2. Register the DTB address |
| |
| Use fdt_register to set the DTB Address in NuttX |
| |
| 3. Parse the DTB |
| |
| Chip/board will use fdt_get to get the DTB Address, and then use fdt_* APIs to |
| parse the DTB properties. |
