我使用的orin nx，我尝试在tegra234-p3767.dtsi中添加serial@3110000{
status = “okay”；
}；但是不起作用，通过dmesg打印发现serial@3110000串口没有启用
Hi 1969288803,
Are you using the devkit or custom board for Orin NX?
Please share the dmesg and device tree for further check.
dmesg.txt (66.7 KB)
我只在设备树tegra234-p3767.dtsi添加了下面红圈这一段
I can not find any messages relating to serial@3110000 in your dmesg.
Could you just configure the status as “okay” w/o other modification and share the full device tree for further check?
You can run the following command to get the device tree configuration(extracted_proc.dts) on your board.
$ sudo dtc -I fs -O dts -o extracted_proc.dts /proc/device-tree
这是我目前的dmesg以及设备树配置
dmesg.txt (70.4 KB)
extracted_proc.dts.txt (331.2 KB)
Please run the following command before test to check if it could help.
$ sudo systemctl stop nvgetty.service
$ sudo systemctl disable nvgetty.service
$ sudo systemctl status nvgetty.service
Where do you get /dev/ttyTHS0?
It may depend on which driver is in use,
From the dmesg you shared before, it should be /dev/ttyS0.
Do you confirm that you are using the UART interface from M.2 Key E port?
Is it the devkit board or custom carrier board?
pin99 and pin101 seem the UART0 of SoM, UART2 of SoC.
It should be uartb@3110000.
serial@3110000 {
resets = <0x03 0x65>;
interrupts = <0x00 0x71 0x04>;
clocks = <0x03 0x9c>;
compatible = "nvidia,tegra234-uart\0nvidia,tegra20-uart";
status = "okay";
reg = <0x00 0x3110000 0x00 0x10000>;
};
Your current configuration in device tree as above looks good to me.
Please also add the following line in device tree and you should get /dev/ttyS3 available for your RS232 communication.
aliases {
i2c3 = "/bus@0/i2c@3190000";
nvdla1 = "/bus@0/host1x@13e00000/nvdla1@158c0000";
i2c1 = "/bus@0/i2c@c240000";
i2c8 = "/bus@0/i2c@31e0000";
i2c6 = "/bus@0/i2c@31c0000";
serial1 = "/bus@0/serial@3100000";
+ serial3 = "/bus@0/serial@3110000";
按你说的添加了以后，使用ttyS3还是不能正常通讯
dmesg.txt (65.7 KB)
但是我使用35.4.1版本的系统使能了serial@3110000以后就能正常通讯；在36.4中我还需要做些什么？
[ 1.764390] kernel: 3110000.serial: ttyS3 at MMIO 0x3110000 (irq = 198, base_baud = 4250000) is a Tegra
It should work since it has been recognized and configured in kernel.
Could you get an oscilloscope to check there’s any waveform when you transmit data?
Could you also compare the device tree and dmesg in both releases?
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