I am currently using the Jetson Nano Development Kit (4GB), but we are working to building our own custom carrier board for the Jetson Nano SOM.
On the dev kit, there is a serial port running on the Micro-USB interface (the USB interface used for recovery mode). On our custom hardware, this USB interface will be configured for host mode and used for USB devices like webcams. I don’t want the serial port enabled on this interface but am having trouble disabling it.
I have found that the serial port is tied to the “/dev/ttyGS0” device. Can anyone provide any details on which driver creates this device and how I might go about disabling it?
hello mfransham ,
please follow below steps to disable it.
- Remove “earlyprintk=uart8250-32bit,0x70006000” from kernel cmdline
- Change ODMDATA to 0x14000, you’ll need to re-flash the target to apply the settings.
- Remove console=ttyS0 in kernel cmdline.
Hi @JerryChang. I appreciate the quick reply.
I am wondering whether we are referring to different serial consoles though. There is the main debug console on the 12-pin header of the dev kit (same header that has the force recovery pins). I want to keep that one. It is the serial console that runs on the micro-USB interface that I want to disable. Could you clarify which serial port your instructions apply to?
As another experiment since my post, I rebuilt the kernel with “CONFIG_USB_GADGET” not set and this seemed to provide the desired results. I no longer see the “/dev/ttyGS0” device and there doesn’t appear to be a serial interface running on the micro-USB interface anymore. Do you know if this is an appropriate solution for what I’m hoping to do?
there’s no serial console that runs on the micro-USB interface on Jetson Nano,
please see-also Jetson Nano Product Design Guide for chapter-11.3 UART.
Perhaps I am misusing the term “serial console”. Maybe UART is the better term?
What I am referring to is that I can plug a Micro-USB to USBA cable between the Jetson Nano dev kit and my laptop and through Putty connect to the Jetson Nano as a COM port. I get a Linux login prompt and can login to the Jetson over this interface. It connects to /dev/ttyGS0. This is the functionality I’m trying to disable for our custom hardware.
/etc/systemd/system/nv-l4t-usb-device-mode.service to configure USB flashing port for device mode.
please have a try to disable this service, thanks
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