The dts does not take effect

wxsrite · August 9, 2024, 8:58am

Hi All：
I use 36.3 and make the following changes.

I customized the dts myself, and modified it directly based on the tegra234-p3737-0000+p3701-0000.dts file.

Why does it seem that the dts does not take effect?

device：

q@q:/boot/dtb$ fdtdump  kernel_tegra234-p3737-0000+p3701-0005-nv.dtb |grep 9546

**** fdtdump is a low-level debugging tool, not meant for general use.
**** If you want to decompile a dtb, you probably want
****     dtc -I dtb -O dts <filename>

            tca9546@70 {
                compatible = "nxp,pca9546";
                    sysfs-device-tree = "/sys/firmware/devicetree/base/bus@0/i2c@3180000/tca9546@70/i2c@0/cam_0@1b";
                    sysfs-device-tree = "/sys/firmware/devicetree/base/bus@0/i2c@3180000/tca9546@70/i2c@0/cam_1@1c";
                    sysfs-device-tree = "/sys/firmware/devicetree/base/bus@0/i2c@3180000/tca9546@70/i2c@1/cam_2@1b";
                    sysfs-device-tree = "/sys/firmware/devicetree/base/bus@0/i2c@3180000/tca9546@70/i2c@1/cam_3@1c";
                    sysfs-device-tree = "/sys/firmware/devicetree/base/bus@0/i2c@3180000/tca9546@70/i2c@2/cam_4@1b";
                    sysfs-device-tree = "/sys/firmware/devicetree/base/bus@0/i2c@3180000/tca9546@70/i2c@2/cam_5@1c";
                    sysfs-device-tree = "/sys/firmware/devicetree/base/bus@0/i2c@3180000/tca9546@70/i2c@3/cam_6@1b";
                    sysfs-device-tree = "/sys/firmware/devicetree/base/bus@0/i2c@3180000/tca9546@70/i2c@3/cam_7@1c";
        cam_out0 = "/bus@0/i2c@3180000/tca9546@70/i2c@0/cam_0@1b/ports/port@0/endpoint";
        cam_out1 = "/bus@0/i2c@3180000/tca9546@70/i2c@0/cam_1@1c/ports/port@0/endpoint";
        dser_0 = "/bus@0/i2c@3180000/tca9546@70/i2c@0/max9296_0@48";
        ser_prim_0 = "/bus@0/i2c@3180000/tca9546@70/i2c@0/max9295_prim_0@40";
        ser_0 = "/bus@0/i2c@3180000/tca9546@70/i2c@0/max9295_0@60";
        ser_1 = "/bus@0/i2c@3180000/tca9546@70/i2c@0/max9295_1@62";
        cam_out2 = "/bus@0/i2c@3180000/tca9546@70/i2c@1/cam_2@1b/ports/port@0/endpoint";
        cam_out3 = "/bus@0/i2c@3180000/tca9546@70/i2c@1/cam_3@1c/ports/port@0/endpoint";
        dser_1 = "/bus@0/i2c@3180000/tca9546@70/i2c@1/max9296_1@48";
        ser_prim_1 = "/bus@0/i2c@3180000/tca9546@70/i2c@1/max9295_prim_1@40";
        ser_2 = "/bus@0/i2c@3180000/tca9546@70/i2c@1/max9295_2@60";
        ser_3 = "/bus@0/i2c@3180000/tca9546@70/i2c@1/max9295_3@62";
        cam_out4 = "/bus@0/i2c@3180000/tca9546@70/i2c@2/cam_4@1b/ports/port@0/endpoint";
        cam_out5 = "/bus@0/i2c@3180000/tca9546@70/i2c@2/cam_5@1c/ports/port@0/endpoint";
        dser_2 = "/bus@0/i2c@3180000/tca9546@70/i2c@2/max9296_2@48";
        ser_prim_2 = "/bus@0/i2c@3180000/tca9546@70/i2c@2/max9295_prim_2@40";
        ser_4 = "/bus@0/i2c@3180000/tca9546@70/i2c@2/max9295_4@60";
        ser_5 = "/bus@0/i2c@3180000/tca9546@70/i2c@2/max9295_5@62";
        cam_out6 = "/bus@0/i2c@3180000/tca9546@70/i2c@3/cam_6@1b/ports/port@0/endpoint";
        cam_out7 = "/bus@0/i2c@3180000/tca9546@70/i2c@3/cam_7@1c/ports/port@0/endpoint";
        dser_3 = "/bus@0/i2c@3180000/tca9546@70/i2c@3/max9296_3@48";
        ser_prim_3 = "/bus@0/i2c@3180000/tca9546@70/i2c@3/max9295_prim_3@40";
        ser_6 = "/bus@0/i2c@3180000/tca9546@70/i2c@3/max9295_6@60";
        ser_7 = "/bus@0/i2c@3180000/tca9546@70/i2c@3/max9295_7@62";
q@q:/boot/dtb$

root@q:/sys/firmware/devicetree/base/bus@0/i2c@3180000# ls
'#address-cells'          clock-frequency   compatible     dmas         name            reg          '#size-cells'   tca9546@70
 assigned-clock-parents   clock-names       dma-coherent   interrupts   phandle         reset-names   status         tca9548@70
 assigned-clocks          clocks            dma-names      iommus       prod-settings   resets        tca6408@21     tca9548@77

root@q:/sys/firmware/devicetree/base/bus@0/i2c@3180000# more /boot/extlinux/extlinux.conf
TIMEOUT 30
DEFAULT primary

MENU TITLE L4T boot options

LABEL primary
      MENU LABEL primary kernel
      LINUX /boot/Image
      INITRD /boot/initrd
      APPEND ${cbootargs} root=PARTUUID=a163bb8f-966a-473d-915a-b1e6b825c628 rw rootwait rootfstype=ext4 mminit_loglevel=4 console=ttyTCU0,115200 console=ttyAMA0
,115200 firmware_class.path=/etc/firmware fbcon=map:0 net.ifnames=0 nospectre_bhb video=efifb:off console=tty0

This change also does not work, and the phenomenon is the same as above.

root@q:~$ more /boot/extlinux/extlinux.conf
TIMEOUT 30
DEFAULT primary

MENU TITLE L4T boot options

LABEL primary
      MENU LABEL primary kernel
      LINUX /boot/Image
	  FDT /boot/dtb/kernel_tegra234-p3737-0000+p3701-0005-nv.dtb
      INITRD /boot/initrd
      APPEND ${cbootargs} root=PARTUUID=5e370ecd-1e9f-4a30-a878-71897146a036 rw rootwait rootfstype=ext4 mminit_loglevel=4 console=ttyTCU0,115200 console=ttyAMA0,115200 firmware_class.path=/etc/firmware
fbcon=map:0 net.ifnames=0 nospectre_bhb video=efifb:off console=tty0

dts：
dts.txt (392.8 KB)
dmesg：
dmesg.txt (64.8 KB)

WayneWWW · August 9, 2024, 9:14am

Better checking if the overlay causes that in your board config.

OVERLAY_DTB_FILE="L4TConfiguration.dtbo,tegra234-p3737-0000+p3701-0000-dynamic.dtbo,tegra234-carveouts.dtbo,tegra-optee.dtbo,tegra234-p3737-camera-dual-imx274-overlay.dtbo,tegra234-p3737-camera-e3331-overlay.dtbo,tegra234-p3737-camera-e3333-overlay.dtbo,tegra234-p3737-camera-imx185-overlay.dtbo";

You can try other change in the device tree to see if this is really “FDT does not take effect” or just some specific node could not be removed.

wxsrite · August 9, 2024, 9:26am

In which file does OVERLAY_DTB_FILE appear?

WayneWWW · August 9, 2024, 9:27am

As I already told, your board config file.

That one you used to flash the board.

wxsrite · August 9, 2024, 12:38pm

w@w:~/flash/jp6.3/Linux_for_Tegra$ lsusb | grep NVIDIA
Bus 001 Device 112: ID 0955:7023 NVIDIA Corp.

w@w:~/flash/jp6.3/Linux_for_Tegra$ more jetson-agx-orin-devkit.conf |grep OVERLAY_DTB_FILE
OVERLAY_DTB_FILE="L4TConfiguration.dtbo,tegra234-p3737-0000+p3701-0000-dynamic.dtbo,tegra234-carveouts.dtbo,tegra-optee.dtbo";
w@w:~/flash/jp6.3/Linux_for_Tegra$

I have modified the above file and deleted the corresponding camera dts, but the dts still does not take effect.

WayneWWW · August 9, 2024, 12:41pm

我這邊用中文解釋一下

你可以不用太執著在camera的東西. 你想要證明dts沒有被換掉 , 就直接在device tree裡面隨便加一段字串看一下這字串有沒有出現.

這個測試可以先做一下判斷到底是有其他東西加了camera的內容還是你的dts真的沒有被更新到…

wxsrite · August 9, 2024, 12:44pm

Hi,
我想直接使用下面方式，配置camera，而不是通过overlay的方式。

WayneWWW · August 9, 2024, 12:45pm

對, 所以你有要試我剛才說的嗎? 先把dts讀到然後再處理你想要做的camera東西可以嗎?

WayneWWW · August 9, 2024, 12:49pm

另外也跟你說明一下… 到目前為止你完全沒有說到你到底想加什麼東西進dts.

你只貼了一個截圖. 那個fg96-8ch-8rgb.dtsi的內容是什麼看起來也沒有提到…

wxsrite · August 9, 2024, 12:51pm

我通过下面方式读取dts：

q@q:~$ dtc -I dtb -O dts -o dts.txt /boot/dtb/kernel_tegra234-p3737-0000+p3701-0005-nv.dtb

发现这里面的内容已经是我想要的了。但是查看dmesg日志，确实没有有关对应的i2c信息，比如，pca9546的相关日志。见最上面我提供的日志。我指定dts也是这个现象。

WayneWWW · August 9, 2024, 12:54pm

ok 那請問現在的問題是? 到底是什麼東西沒有出來?

wxsrite · August 9, 2024, 12:55pm

camera.zip (5.8 KB)

内容如上。

WayneWWW · August 9, 2024, 12:56pm

我把問題講的簡單一點好了…請問你的/proc/device-tree底下的東西到底有沒有符合你改的?

如果沒有, 是什麼部分不一樣…?

wxsrite · August 9, 2024, 12:58pm

3180000下面没有任何设备，没有9546的信息。

信息是这样的：

我的刷机命令如下：

sudo ./tools/kernel_flash/l4t_initrd_flash.sh --external-device nvme0n1p1 -c tools/kernel_flash/flash_l4t_external.xml --showlogs --network usb0 jetson-agx-orin-devkit internal

WayneWWW · August 9, 2024, 1:00pm

不是有嗎…? tca9546@70…

wxsrite · August 9, 2024, 1:08pm

OK，我检查一下，添加日志验证一下！

WayneWWW · August 9, 2024, 1:10pm

我再澄清一下…這一條的topic只有管你的device tree讀不讀的到而已.

你的內容有沒有寫對不在我們這條討論的範圍… 如果driver的行為有問題/不如預期, 請你開一個新的討論.

wxsrite · August 9, 2024, 1:12pm

OK，了解，谢谢！

system · August 23, 2024, 1:12pm

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The dts does not take effect

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