Xavier AGX Serial debugging port issue

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Xavier
1

hi

I have two AGX devices, and one’s serial debugging port works fine. Here is log from dmesg --follow.

[ 2782.411859] usb 1-2: new high-speed USB device number 14 using xhci_hcd

[ 2782.560228] usb 1-2: New USB device found, idVendor=0403, idProduct=6011, bcdDevice= 8.00

[ 2782.560230] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0

[ 2782.560231] usb 1-2: Product: Quad RS232-HS

[ 2782.560231] usb 1-2: Manufacturer: FTDI

[ 2782.576963] usbcore: registered new interface driver ftdi_sio

[ 2782.576973] usbserial: USB Serial support registered for FTDI USB Serial Device

[ 2782.577070] ftdi_sio 1-2:1.0: FTDI USB Serial Device converter detected

[ 2782.577093] usb 1-2: Detected FT4232H

[ 2782.577295] usb 1-2: FTDI USB Serial Device converter now attached to ttyUSB1

[ 2782.577328] ftdi_sio 1-2:1.1: FTDI USB Serial Device converter detected

[ 2782.577346] usb 1-2: Detected FT4232H

[ 2782.577497] usb 1-2: FTDI USB Serial Device converter now attached to ttyUSB2

[ 2782.577536] ftdi_sio 1-2:1.2: FTDI USB Serial Device converter detected

[ 2782.577568] usb 1-2: Detected FT4232H

[ 2782.577673] usb 1-2: FTDI USB Serial Device converter now attached to ttyUSB3

[ 2782.577706] ftdi_sio 1-2:1.3: FTDI USB Serial Device converter detected

[ 2782.577739] usb 1-2: Detected FT4232H

[ 2782.577838] usb 1-2: FTDI USB Serial Device converter now attached to ttyUSB4

[ 2852.252762] usb 1-2: USB disconnect, device number 14

[ 2852.253174] ftdi_sio ttyUSB1: FTDI USB Serial Device converter now disconnected from ttyUSB1

[ 2852.253211] ftdi_sio 1-2:1.0: device disconnected

[ 2852.253561] ftdi_sio ttyUSB2: FTDI USB Serial Device converter now disconnected from ttyUSB2

[ 2852.253591] ftdi_sio 1-2:1.1: device disconnected

[ 2852.253915] ftdi_sio ttyUSB3: FTDI USB Serial Device converter now disconnected from ttyUSB3

[ 2852.253950] ftdi_sio 1-2:1.2: device disconnected

[ 2852.254240] ftdi_sio ttyUSB4: FTDI USB Serial Device converter now disconnected from ttyUSB4

[ 2852.254267] ftdi_sio 1-2:1.3: device disconnected

and I can find list form lsusb too:
Bus 001 Device 016: ID 0403:6011 Future Technology Devices International, Ltd FT4232H Quad HS USB-UART/FIFO IC

In the other AGX device, I use same usb cable and also same PC USB port, nothing happen. I have tried to refresh device, but still same issue.

Please help to advise if this is hardware issue. If so, how can I do the RMA?

Thanks,

hal.

2

On the non-working unit, what do you see after boot from:
dmesg | grep -i usb

Also, is there any difference between two so far as software versions? In part this is a comparison of their L4T release as found from “head -n 1 /etc/nv_tegra_release”. The other part of the question is whether there might be any device tree or other modifications on one of them. If both units were fully flashed with the same release (flash not specifying just a partition or some partial flash), then they should be exact matches, but if any of the two was ever flashed using extra flags, then some part of the content might differ even if the release is the same. I’m going to guess this will turn out to be a hardware failure, but you have to first consider differences in software, and content in the QSPI memory and non-rootfs content has a lot to do with hardware setup even if the release is otherwise the same.

3

@linuxdev

Thanks for your suggestion.
I couldn’t figure out where is the issue, so I refresh the kit with latest Jetpack, and it fixes the problem.

Hal.