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products:sbc:vim4:configurations:device-tree-overlay [2022/07/06 02:57] nick |
products:sbc:vim4:configurations:device-tree-overlay [2022/09/28 08:45] nick |
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- | ====== Device Tree Overlay ====== | + | {{indexmenu_n> |
- | ===== Introduction ===== | ||
- | You can use Device Tree Overlay | + | ====== VIM4 Device Tree Overlay |
- | ===== Configuration ===== | + | {{page> |
- | + | ||
- | The dtbo files are stored in directory ''/ | + | |
- | + | ||
- | ``` | + | |
- | khadas@Khadas:~$ ls -al / | + | |
- | total 28 | + | |
- | drwxr-xr-x 2 root root 4096 Jul 6 14:55 . | + | |
- | drwxr-xr-x 3 root root 4096 Jul 6 14:55 .. | + | |
- | -rwxr-xr-x 1 root root 462 Jul 6 14:55 ext_board.dtbo | + | |
- | -rwxr-xr-x 1 root root 223 Jul 6 14:55 i2cm_a.dtbo | + | |
- | -rwxr-xr-x 1 root root 223 Jul 6 14:55 i2cm_f.dtbo | + | |
- | -rwxr-xr-x 1 root root 225 Jul 6 14:55 pwm_f.dtbo | + | |
- | -rwxr-xr-x 1 root root 225 Jul 6 14:55 uart_e.dtbo | + | |
- | ``` | + | |
- | + | ||
- | + | ||
- | ===== Make Your Own DTBO Files ===== | + | |
- | + | ||
- | + | ||
- | There are some ready to use dtbo files, you can also add your own dtbos to enable or disable the peripherals. | + | |
- | + | ||
- | + | ||
- | ```sh | + | |
- | khadas@Khadas: | + | |
- | ``` | + | |
- | + | ||
- | * Write your own device tree overlay | + | |
- | /dts-v1/; | + | |
- | /plugin/; | + | |
- | + | ||
- | / { | + | |
- | fragment@0 { | + | |
- | target = <&i2c3>; | + | |
- | + | ||
- | __overlay__ { | + | |
- | status = " | + | |
- | | + | |
- | | + | |
- | }; | + | |
- | ``` | + | |
- | + | ||
- | This device tree overlay is to enable `i2c3`. | + | |
- | + | ||
- | * Compile it to dtbo ``` | + | |
- | khadas@Khadas: | + | |
- | khadas@Khadas: | + | |
- | example.dtbo | + | |
- | ``` | + | |
- | + | ||
- | * Move the dtbo file to ''/ | + | |
- | + | ||
- | * Edit ''/ | + | |
- | + | ||
- | * Reboot the board | + |