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| − | {{rockpi4_header}}
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| − | {{Languages|rockpi4/hardware/devtree_overlays | Linux5.10 Device Tree Overlays}}
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| − | [[rockpi4 | ROCK Pi 4]] > [[rockpi4/hardware | Hardware]] > [[rockpi4/hardware/devtree_overlays | Linux5.10 Device Tree Overlays]]
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| − |
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| − | === Device Tree Overlays===
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| − |
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| − | ==== Introduction ====
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| − |
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| − | This directory contains Device Tree overlays. Device Tree makes it possible
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| − | to support many hardware configurations with a single kernel and without the
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| − | need to explicitly load or blacklisr kernel modules.
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| − |
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| − | On Radxa borad which uses linux5.10 kernel, you can use "rsetup" to load overlays that you want to enable, rsetup load overlays' dtbo from [[https://github.com/radxa/overlays/tree/main/arch/arm64/boot/dts/rockchip/overlays Radxa/overlay]]
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| − |
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| − |
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| − | ==== How to enable a overlay dtbo ====
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| − |
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| − | run "rsetup" command as below:
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| − | radxa@rock-4c-plus:~$ rsetup
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| − |
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| − | Please select an option below:
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| − |
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| − | System Maintaince
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| − | Onboard Hardware
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| − | Overlay Management
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| − | Connectivity
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| − | User Settings
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| − | Localization
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| − | Common Tasks
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| − | About
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| − |
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| − |
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| − | <Ok> <Cancel>
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| − |
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| − |
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| − | Select "Overlay Management"
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| − |
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| − | Configure Device Tree Overlay
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| − | Install overlay from source
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| − | Manage installed overlay
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| − | Rebuild boot configuration
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| − | Reset overlay libraries with kernel's default
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| − |
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| − |
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| − | <Ok> <Cancel>
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| − |
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| − | Select "Manage installed overlay",
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| − |
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| − |
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| − | [ ] audioinjector-isolated-soundcard.dtbo
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| − | [ ] cm3-sodimm-io-sata.dtbo
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| − | [ ] radxa-5inch-touchscreen-on-cm3-sodimm-io.dtbo
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| − | [ ] radxa-5inch-touchscreen-on-rock-3a.dtbo
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| − | [ ] radxa-5inch-touchscreen-on-rock-3b.dtbo
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| − | [ ] radxa-cm3-io-dual-cameras-gc2053.dtbo
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| − | [ ] radxa-cm3-io-hd101boe9365-display.dtbo
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| − | [ ] radxa-cm3-io-headphone.dtbo
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| − | [ ] radxa-cm3-io-i2c0-hym8563.dtbo
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| − | [ ] radxa-cm3-io-pcie2x1.dtbo
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| − | [ ] radxa-cm3-io-radxa-10p1inch-display.dtbo
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| − | [ ] radxa-cm3-io-sata1.dtbo
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| − | [ ] radxa-cm3-io-sata2.dtbo
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| − | [ ] radxa-cm3-io-sharp-lq133t1jw01-without-hdmi.dtbo
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| − | [ ] radxa-cm3-raspcm4io-pcie2x1.dtbo
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| − | [ ] radxa-cm3-sodimm-io-raspberrypi-7inch-touchscreen.dtbo
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| − | [ ] radxa-cm3i-gmac1.dtbo
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| − | [ ] rk3399-dwc3-0-host.dtbo
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| − | [ ] rk3399-dwc3-0-otg.dtbo
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| − | [ ] rk3399-dwc3-0-peripheral.dtbo
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| − | [ ] rk3399-opp-1800.dtbo
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| − | [ ] rk3399-opp-2000.dtbo
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| − | [ ] rk3399-opp-2200.dtbo
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| − | [ ] rk3399-opp-2400.dtbo
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| − | [ ] rk3399-spi-5-enc28j60.dtbo
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| − | [ ] rk3399-spi-gpio-enc28j60.dtbo
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| − | [ ] rk3399-uart0.dtbo
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| − | [ ] rk3568-can1-m0.dtbo
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| − | [ ] rk3568-can1-m1.dtbo
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| − | [ ] rk3568-disable-gmac1.dtbo
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| − | [ ] rk3568-disable-npu.dtbo
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| − | [ ] rk3568-fiq-debugger-uart0.dtbo
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| − | [ ] rk3568-fiq-debugger-uart2m0.dtbo
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| − | [ ] rk3568-fiq-debugger-uart3m0.dtbo
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| − | [ ] rk3568-fiq-debugger-uart5m1.dtbo
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| − | [ ] rk3568-fiq-debugger-uart7m1.dtbo
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| − | [ ] rk3568-fiq-debugger-uart8m1.dtbo
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| − | [ ] rk3568-fiq-debugger-uart9m1.dtbo
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| − | [ ] rk3568-i2c2-m0.dtbo
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| − |
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| − |
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| − | <Ok> <Cancel>
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| − |
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| − |
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| − | Select the overlays you want to load with the space bar,
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| − |
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| − | [*] rk3399-uart0.dtbo
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| − |
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| − | Overlay with a "*" indicates that it is enabled.
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| − |
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| − | reboot, to make overlays work
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| − | <pre>
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| − | sudo reboot
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| − | </pre>
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| − |
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| − |
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| − | ==== How to use a overylay written by yourselt ====
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| − | ===== DTBO code specification =====
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| − |
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| − | Because of the number of products we have, writing the device tree overlay(dtbo) for each product has become a significant burden. To improve code reuse, you now need to specify metadata for dtbo to facilitate sharing of the same dtbo across different products.
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| − | In our dtbo source file, you need add a new node named "matedata", this node needs the following fields:
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| − | * title: it's property is text, used to display in the rsetup menu, there is no necessary to also indicate the supported development board.
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| − | * compatible: it's property is array, Compatible products or SOCs can be specified. If dtbo is not cross-product compatible, the corresponding SoC cannot be filled in.
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| − | * category: text, Used to classify in the rsetup menu. At present, only 'display', 'camera' and 'misc' are defined
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| − | * description: text, The functions and precautions of dtbo are briefly introduced, used to display dtbo when installing rsetup.
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| − |
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| − | ===== get the sdk source =====
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| − | [[https://github.com/radxa/rockchip-bsp SDK rockchip-bsp]]
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| − | install the tools
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| − | <pre>
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| − | sudo apt-get update
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| − | sudo apt-get install git device-tree-compiler build-essential
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| − | </pre>
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| − |
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| − | ===== get the source code and update it =====
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| − | <pre>
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| − | git clone -b master https://github.com/radxa/rockchip-bsp.git
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| − | cd rockchip-bsp
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| − | git submodule init
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| − | git submodule update
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| − | cd rockchip-bsp
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| − | git checkout master
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| − | git fetch origin
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| − | git rebase origin/master
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| − | git submodule update
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| − | </pre>
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| − |
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| − |
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| − | overlay source code are located under the directory "rockchip-bsp/kerne/arch/arm64/boot/dts/rockchip/overlay/",
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| − |
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| − | ===== write overlay code =====
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| − | example:
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| − | rk3399-rock4-i2c7.dts
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| − | <pre>
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| − | /dts-v1/;
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| − | /plugin/;
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| − |
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| − | / {
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| − | metadata {
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| − | title = "Enable i2c7 on ROCK 4 plus";
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| − | compatible = "radxa,rock-4c-plus", "rockchip,rk3399";
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| − | category = "misc";
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| − | description = "Enable Radxa rock-4c-plus i2c7";
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| − | };
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| − |
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| − | fragment@0 {
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| − | target = <&i2c7>;
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| − | __overlay__ {
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| − | status = "okay";
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| − | };
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| − | };
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| − | };
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| − | </pre>
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| − |
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| − | ===== compile the dts to dtbo =====
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| − |
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| − | <pre>
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| − | rockchip-bsp/kernel$ make dtbs
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| − | </pre>
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| − |
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| − | ===== Upload it to the board =====
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| − | <pre>
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| − | scp rk3399-rock4-i2c7.dts radxa@192.168.xx.xx:~
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| − | </pre>
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| − |
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| − | ===== move the dtbo to correct directory =====
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| − | radxa@rock-4c-plus:~$ sudo mv rk3399-rock4-i2c7.dtbo /boot/dtbo
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| − |
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| − | Then, use rsetup to check to whether that overlay is enabled, the steps are similar to "How to enable a overlay dtbo" .
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| − | Finally, reboot the board, you will see i2c-7 under the /dev/ directory.
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