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

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products:sbc:common:configurations:device-tree-overlay [2022/09/23 23:21]
frank [Configuration DT overlays] 		products:sbc:common:configurations:device-tree-overlay [2023/11/07 04:18] (current)
nick
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 We can use DT overlays to enable/disable or change configuration for peripherals without recompiling the DT kernel source code. We can use DT overlays to enable/disable or change configuration for peripherals without recompiling the DT kernel source code.
 +
 +===== DT collections  =====
 +
 +https://github.com/khadas/khadas-linux-kernel-dt-overlays
  
 ===== Device Reference Table ====== ===== Device Reference Table ======
  
-^         ^  DT overlays folder                                 ^  DT overlays list variable  ^  DT overlays config file                           ^ +^         ^  Kernel Version  ^  DT overlays folder                                    ^  DT overlays list variable  ^  DT overlays config file                                  ^ 
-^  VIM1   |  /boot/dtb/overlays/kvim                               |  overlays          |  /boot/env.txt                                            | +^  VIM1   |  4.9/mainline    |  /boot/dtb/overlays/kvim                               |  overlays                   |  /boot/env.txt                                            | 
-^  VIM2   |  /boot/dtb/overlays/kvim2                              | :::                | :::                                                       | +^  VIM2   |  4.9/mainline    |  /boot/dtb/overlays/kvim2                              | :::                         | :::                                                       | 
-^  VIM3   |  /boot/dtb/overlays/kvim3                              | :::                | :::                                                       | +^  VIM3   |  4.9/mainline    |  /boot/dtb/overlays/kvim3                              | :::                         | :::                                                       | 
-^  VIM3L  |  /boot/dtb/overlays/kvim3l                             | :::                | :::                                                       | +| :::     |  5.15            |  /boot/dtb/amlogic/kvim3.dtb.overlays                  |  fdt_overlays               |  /boot/dtb/amlogic/kvim3l.dtb.overlay.env                 | 
-^  VIM1S  |  /boot/dtb/amlogic/kvim1s.dtb.overlays                 |  fdt_overlays      |  /boot/dtb/amlogic/kvim1s.dtb.overlay.env                 | +^  VIM3L  |  4.9/mainline    |  /boot/dtb/overlays/kvim3l                             |  overlays                   |  /boot/env.txt                                            | 
-^  VIM4   |  /boot/dtb/amlogic/kvim4.dtb.overlays                  | :::                |  /boot/dtb/amlogic/kvim4.dtb.overlay.env                  | +| :::     |  5.15            |  /boot/dtb/amlogic/kvim3l.dtb.overlays                 |  fdt_overlays               |  /boot/dtb/amlogic/kvim3l.dtb.overlay.env                 | 
-^  Edge2  |  /boot/dtb/rockchip/rk3588s-khadas-edge2.dtb.overlays  |  :::               |  /boot/dtb/rockchip/rk3588s-khadas-edge2.dtb.overlay.env  | +^  VIM1S  |  5.4/5.15        |  /boot/dtb/amlogic/kvim1s.dtb.overlays                 | :::                         |  /boot/dtb/amlogic/kvim1s.dtb.overlay.env                 | 
-^  Edge1  |  /boot/dtb/rockchip/overlays/caption                   |  overlays          |  /boot/env.txt                                            | +^  VIM4   |  5.4/5.15        |  /boot/dtb/amlogic/kvim4.dtb.overlays                  | :::                         |  /boot/dtb/amlogic/kvim4.dtb.overlay.env                  | 
-| :::     |  /boot/dtb/rockchip/overlays/edgev                     | :::                | :::                                                       |+^  Edge2  |  5.10            |  /boot/dtb/rockchip/rk3588s-khadas-edge2.dtb.overlays  | :::                         |  /boot/dtb/rockchip/rk3588s-khadas-edge2.dtb.overlay.env  | 
 +^  Edge1  |  4.4             |  /boot/dtb/rockchip/overlays/captain                   |  overlays                   |  /boot/env.txt                                            | 
 +| :::     | :::              |  /boot/dtb/rockchip/overlays/edgev                     | :::                         | :::                                                       |
  
 ===== Device Configurations ===== ===== Device Configurations =====
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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
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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 =====
  
 There are some preparations steps for DT overlays ''dtbo'' files, you can also add custom DT overlays. There are some preparations steps for DT overlays ''dtbo'' files, you can also add custom DT overlays.
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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''
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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''
Last modified: 2022/09/23 23:21 by frank

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