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products:sbc:common:configurations:device-tree-overlay

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products:sbc:common:configurations:device-tree-overlay [2022/09/22 02:30]
hyphop 		products:sbc:common:configurations:device-tree-overlay [2026/05/11 02:18] (current)
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-====== Device Tree Overlay ======+====== Device tree overlay ======
  
-We can use DT overlays to enable or disable the peripherals without recompiling the kernel source code.+We can use DT overlays to enable/disable or change configuration for peripherals without recompiling the DT kernel source code.
  
-===== Boards reference table ======+===== DT collections  =====
  
-^         ^  DT Overlays Directory                                 ^  DT Overlays Node  ^  DT Overlays Configuration File                           ^ +https://github.com/khadas/khadas-linux-kernel-dt-overlays
-^  VIM1   |  /boot/dtb/overlays/kvim                               |  overlays          |  /boot/env.txt                                            | +
-^  VIM2   |  /boot/dtb/overlays/kvim2                              | :::                | :::                                                       | +
-^  VIM3   |  /boot/dtb/overlays/kvim3                              | :::                | :::                                                       | +
-^  VIM3L  |  /boot/dtb/overlays/kvim3l                             | :::                | :::                                                       | +
-^  VIM1S  |  /boot/dtb/amlogic/kvim1s.dtb.overlays                 |  fdt_overlays      |  /boot/dtb/amlogic/kvim1s.dtb.overlay.env                 | +
-^  VIM4   |  /boot/dtb/amlogic/kvim4.dtb.overlays                  | :::                |  /boot/dtb/amlogic/kvim4.dtb.overlay.env                  | +
-^  Edge2  |  /boot/dtb/rockchip/rk3588s-khadas-edge2.dtb.overlays  |  :::               |  /boot/dtb/rockchip/rk3588s-khadas-edge2.dtb.overlay.env  | +
-^  Edge1  |  /boot/dtb/rockchip/overlays/caption                   |  overlays          |  /boot/env.txt                                            | +
-| :::     |  /boot/dtb/rockchip/overlays/edgev                     | :::                | :::                                                       |+
  
-===== Boards configurations =====+===== Device reference table ======
  
-<tabbox VIM1/2/3/3L/Edge1>+^         ^  Kernel Version  ^  DT overlays folder                                    ^  DT overlays list variable  ^  DT overlays config file                                  ^ 
 +^  VIM1   |  4.9/mainline    |  /boot/dtb/overlays/kvim                               |  overlays                   |  /boot/env.txt                                            | 
 +^  VIM2   |  4.9/mainline    |  /boot/dtb/overlays/kvim2                              | :::                         | :::                                                       | 
 +^  VIM3   |  4.9/mainline    |  /boot/dtb/overlays/kvim3                              | :::                         | :::                                                       | 
 +| :::     |  5.15            |  /boot/dtb/amlogic/kvim3.dtb.overlays                  |  fdt_overlays               |  /boot/dtb/amlogic/kvim3l.dtb.overlay.env                 | 
 +^  VIM3L  |  4.9/mainline    |  /boot/dtb/overlays/kvim3l                             |  overlays                   |  /boot/env.txt                                            | 
 +| :::     |  5.15            |  /boot/dtb/amlogic/kvim3l.dtb.overlays                 |  fdt_overlays               |  /boot/dtb/amlogic/kvim3l.dtb.overlay.env                 | 
 +^  VIM1S  |  5.4/5.15        |  /boot/dtb/amlogic/kvim1s.dtb.overlays                 | :::                         |  /boot/dtb/amlogic/kvim1s.dtb.overlay.env                 | 
 +^  VIM4   |  5.4/5.15        |  /boot/dtb/amlogic/kvim4.dtb.overlays                  | :::                         |  /boot/dtb/amlogic/kvim4.dtb.overlay.env                  | 
 +^  Edge2  |  5.10            |  /boot/dtb/rockchip/rk3588s-khadas-edge2.dtb.overlays  | :::                         |  /boot/dtb/rockchip/rk3588s-khadas-edge2.dtb.overlay.env  | 
 +^ Edge-2L |  6.1             |  /boot/dtb/rockchip/rk3576-khadas-edge-2l.dtb.overlays  | :::                         |  /boot/dtb/rockchip/rk3576-khadas-edge-2l.dtb.overlay.env  | 
 +^  Edge1  |  4.4             |  /boot/dtb/rockchip/overlays/captain                   |  overlays                   |  /boot/env.txt                                            | 
 +| :::     | :::              |  /boot/dtb/rockchip/overlays/edgev                     | :::                         | :::                                                       |
  
-<WRAP tip > +===== Device configurations =====
-This page takes VIM3 as an example, which can be different from yours but the structure is the same. +
-</WRAP>+
  
 +<tabbox VIM1/2/3/3L/Edge1>
  
 DT-overlays ''dtbo'' directory: ''/boot/dtb/overlays/**BOARD**'' DT-overlays ''dtbo'' directory: ''/boot/dtb/overlays/**BOARD**''
- 
-```shell 
-khadas@Khadas:~$ ls -l1  /boot/dtb/overlays/kvim3 
-total 40 
--rw-r--r-- 1 root root  352 Jan 29 09:35 disable-ts050.dtbo 
--rw-r--r-- 1 root root  223 Jan 29 09:35 i2c3.dtbo 
--rw-r--r-- 1 root root  277 Jan 29 09:35 m2x-eth.dtbo 
--rw-r--r-- 1 root root  472 Jan 29 09:35 onewire.dtbo 
--rw-r--r-- 1 root root 1072 Jan 29 09:35 os08a10.dtbo 
--rw-r--r-- 1 root root  345 Jan 29 09:35 pwm_f.dtbo 
--rw-r--r-- 1 root root  447 Jan 29 09:35 spi1.dtbo 
--rw-r--r-- 1 root root  225 Jan 29 09:35 uart3.dtbo 
-``` 
  
 <WRAP important > <WRAP important >
-**BOARD** should be ''vim1'', ''vim2'', ''vim3'', ''vim3l'' or ''edge''.+**BOARD** should be ''kvim1'', ''kvim2'', ''kvim3'', ''kvim3l'' or ''edgev''.
 </WRAP> </WRAP>
  
-DT-overlays configuration file: ''/boot/env.txt''.+<WRAP tip > 
 +Next example for VIM3 device, which can be different for other device, but the structure is the same. 
 +</WRAP>
  
-```txt+```shell 
 +khadas@Khadas:~$ ls -1 /boot/dtb/overlays/kvim3/ 
 +disable-ts050.dtbo 
 +i2c3.dtbo 
 +m2x-eth.dtbo 
 +onewire.dtbo 
 +os08a10.dtbo 
 +pwm_f.dtbo 
 +spi1.dtbo 
 +uart3.dtbo 
 +``` 
 + 
 +DT-overlays configuration file: 
 + 
 +```txt /boot/env.txt
 # Device Tree Overlays # Device Tree Overlays
 #   uart3           -- Enable UART3 (uart_C, GPIO Header PIN15 & PIN16) #   uart3           -- Enable UART3 (uart_C, GPIO Header PIN15 & PIN16)
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   * If you want to disable ''pwm_f'' you can remove ''pwm_f'' from ''overlays'' list variable   * If you want to disable ''pwm_f'' you can remove ''pwm_f'' from ''overlays'' list variable
   * If you want to enable ''onewire'', you can add ''onewire'' to ''overlays'' list variable   * If you want to enable ''onewire'', you can add ''onewire'' to ''overlays'' list variable
 +
 +<tabbox VIM3 with 5.15 kernel>
 +
 +DT-overlays ''dtbo'' directory: ''/boot/dtb/amlogic/kvim3.dtb.overlays''.
 +
 +```shell
 +khadas@Khadas:~$ ls -1 /boot/dtb/amlogic/kvim3.dtb.overlays/
 +uart3.dtbo
 +pwm_f.dtbo
 +i2c3.dtbo
 +spi1.dtbo
 +os08a10.dtbo
 +onewire.dtbo
 +disable-ts050.dtbo
 +m2x-eth.dtbo
 +otg-device.dtbo
 +```
 +
 +DT-overlays configuration file: ''/boot/dtb/amlogic/kvim3.dtb.overlay.env''.
 +
 +<tabbox VIM3L with 5.15 kernel>
 +
 +DT-overlays ''dtbo'' directory: ''/boot/dtb/amlogic/kvim3l.dtb.overlays''.
 +
 +```shell
 +khadas@Khadas:~$ ls -1 /boot/dtb/amlogic/kvim3.dtb.overlays/
 +uart3.dtbo
 +pwm_f.dtbo
 +i2c3.dtbo
 +spi1.dtbo
 +os08a10.dtbo
 +onewire.dtbo
 +disable-ts050.dtbo
 +m2x-eth.dtbo
 +otg-device.dtbo
 +```
 +
 +DT-overlays configuration file: ''/boot/dtb/amlogic/kvim3l.dtb.overlay.env''.
  
 <tabbox VIM4> <tabbox VIM4>
  
-DT-overlays ''dtbo'' directory: ''/boot/dtb/amlogic/kvim4.dtb.overlays''+DT-overlays ''dtbo'' directory: ''/boot/dtb/amlogic/kvim4.dtb.overlays''.
  
 ```shell ```shell
-khadas@Khadas:~$ ls -l1 /boot/dtb/amlogic/kvim4.dtb.overlays/ +khadas@Khadas:~$ ls -1 /boot/dtb/amlogic/kvim4.dtb.overlays/ 
-total 28 +ext_board.dtbo 
--rwxr-xr-x 1 root root  462 Jul  6 14:55 ext_board.dtbo +i2cm_a.dtbo 
--rwxr-xr-x 1 root root  223 Jul  6 14:55 i2cm_a.dtbo +i2cm_f.dtbo 
--rwxr-xr-x 1 root root  223 Jul  6 14:55 i2cm_f.dtbo +pwm_f.dtbo 
--rwxr-xr-x 1 root root  225 Jul  6 14:55 pwm_f.dtbo +uart_e.dtbo
--rwxr-xr-x 1 root root  225 Jul  6 14:55 uart_e.dtbo+
 ``` ```
  
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 ```shell ```shell
-khadas@Khadas:~$ ls -l1 /boot/dtb/amlogic/kvim1s.dtb.overlays/ +khadas@Khadas:~$ ls -1 /boot/dtb/amlogic/kvim1s.dtb.overlays/ 
-total 28 +i2cm_b.dtbo 
--rw-rw-r-- 1 root root  223 Aug 12 10:59 i2cm_b.dtbo +i2cm_e.dtbo 
--rw-rw-r-- 1 root root  223 Aug 12 10:59 i2cm_e.dtbo +pwm_f.dtbo 
--rw-rw-r-- 1 root root  345 Aug 12 10:59 pwm_f.dtbo +uart_c.dtbo
--rw-rw-r-- 1 root root  225 Aug 12 10:59 uart_c.dtbo+
 ``` ```
- 
 DT-overlays configuration file is ''/boot/dtb/amlogic/kvim1s.dtb.overlay.env''. DT-overlays configuration file is ''/boot/dtb/amlogic/kvim1s.dtb.overlay.env''.
  
 <tabbox Edge2> <tabbox Edge2>
  
-DT-overlays ''dtbo'' directory:  ''/boot/dtb/rockchip/rk3588s-khadas-edge2.dtb.overlays'':+DT-overlays ''dtbo'' directory: ''/boot/dtb/rockchip/rk3588s-khadas-edge2.dtb.overlays''
  
 ```shell ```shell
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 DT-overlays configuration file: ''/boot/dtb/rockchip/rk3588s-khadas-edge2.dtb.overlay.env'' DT-overlays configuration file: ''/boot/dtb/rockchip/rk3588s-khadas-edge2.dtb.overlay.env''
 +
 +<tabbox Edge-2L>
 +
 +DT-overlays ''dtbo'' directory: ''/boot/dtb/rockchip/rk3576-khadas-edge-2l.dtb.overlays''
 +
 +```shell
 +khadas@Khadas:~$ ls /boot/dtb/rockchip/rk3576-khadas-edge-2l.dtb.overlays
 +edge-2l-io-pwm.dtbo
 +edge-2l-io-spi.dtbo
 +```
 +
 +DT-overlays configuration file: ''/boot/dtb/rockchip/rk3576-khadas-edge-2l.dtb.overlay.env''
  
 </tabbox> </tabbox>
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 ===== Configuration DT overlays ===== ===== Configuration DT overlays =====
  
-Need edit the DT overlays configuration file and add custom DT overlays ''dtbo'' files to special folder.+You need to edit the DT overlays configuration file and add custom DT overlays ''dtbo'' files to special folder.
  
 ===== Make custom DT overlays ===== ===== Make custom DT overlays =====
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 ==== Write DT overlay source==== ==== Write DT overlay source====
  
-Basic example:+Basic  DT overlay source example:
  
 ```dts example.dts  ```dts example.dts 
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 ==== Copy DT overlays to special folder ==== ==== Copy DT overlays to special folder ====
  
 +  * VIM3 with 5.15 kernel is ''/boot/dtb/amlogic/kvim3.dtb.overlays'' 
 +  * VIM3L with 5.15 kernel is ''/boot/dtb/amlogic/kvim3l.dtb.overlays'' 
   * VIM4 is ''/boot/dtb/amlogic/kvim4.dtb.overlays''    * VIM4 is ''/boot/dtb/amlogic/kvim4.dtb.overlays'' 
   * VIM1S is ''/boot/dtb/amlogic/kvim1s.dtb.overlays''   * VIM1S is ''/boot/dtb/amlogic/kvim1s.dtb.overlays''
   * Edge2 is ''/boot/dtb/rockchip/rk3588s-khadas-edge2.dtb.overlays''   * Edge2 is ''/boot/dtb/rockchip/rk3588s-khadas-edge2.dtb.overlays''
-  * VIM1/2/3/3L/Edge1 is ''/boot/dtb/overlays/**BOARD**'' +  * Edge-2L is ''/boot/dtb/rockchip/rk3576-khadas-edge-2l.dtb.overlays'' 
 +  * VIM1/2/3/3L/Edge1 is ''/boot/dtb/overlays/%%*%%*BOARD%%*%%*'' 
  
 <WRAP important > <WRAP important >
-**BOARD** should be ''vim1'', ''vim2'', ''vim3'', ''vim3l'' or ''edge''+**BOARD** should be ''kvim1'', ''kvim2'', ''kvim3'', ''kvim3l'' or ''edgev''.
 </WRAP> </WRAP>
  
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   * VIM1/2/3/3L/Edge1 is ''/boot/env.txt''   * VIM1/2/3/3L/Edge1 is ''/boot/env.txt''
 +  * VIM3 with 5.15 kernel is ''/boot/dtb/amlogic/kvim3.dtb.overlay.env''
 +  * VIM3L with 5.15 kernel is ''/boot/dtb/amlogic/kvim3l.dtb.overlay.env''
   * VIM4 is ''/boot/dtb/amlogic/kvim4.dtb.overlay.env''   * VIM4 is ''/boot/dtb/amlogic/kvim4.dtb.overlay.env''
   * VIM1S is ''/boot/dtb/amlogic/kvim4.dtb.overlay.env''   * VIM1S is ''/boot/dtb/amlogic/kvim4.dtb.overlay.env''
   * Edge2 is ''/boot/dtb/rockchip/rk3588s-khadas-edge2.dtb.overlay.env''   * Edge2 is ''/boot/dtb/rockchip/rk3588s-khadas-edge2.dtb.overlay.env''
 +  * Edge-2L is ''/boot/dtb/rockchip/rk3576-khadas-edge-2l.dtb.overlay.env''
  
 ==== Reboot ==== ==== Reboot ====
  
 Need reboot board to take effect. Need reboot board to take effect.
Last modified: 2022/09/22 02:30 by hyphop

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