Serial connection is not working during last step of flash to OS5.2.6

[tingguang.wang1]

Please provide the following info (check/uncheck the boxes after creating this topic):
Software Version
DRIVE OS Linux 5.2.6
DRIVE OS Linux 5.2.6 and DriveWorks 4.0
DRIVE OS Linux 5.2.0
DRIVE OS Linux 5.2.0 and DriveWorks 3.5
NVIDIA DRIVE™ Software 10.0 (Linux)
NVIDIA DRIVE™ Software 9.0 (Linux)
other DRIVE OS version
other

Target Operating System
Linux
QNX
other

Hardware Platform
NVIDIA DRIVE™ AGX Xavier DevKit (E3550)
NVIDIA DRIVE™ AGX Pegasus DevKit (E3550)
other

SDK Manager Version
1.9.1.10844
other

Host Machine Version
native Ubuntu 18.04
other

Hello,
I am flashing my pegasus target board (A+B) from sw10 to 5.2.6
now error was provided in SDK manager

according to NV instruction, “The user must connect to the DRIVE AGX platform console via a terminal emulator to determine when flashing has been completed, and to complete the platform setup.”
“The customer is recommended to use the “putty” terminal emulation program for better display of the setup prompts.”

I have try both putty and minicom to connect to serial port.
But I guess the connection is not sucessful, which I am not sure

putty configuration looks like this, no window pop out after click open

minicom terminal look like this, no message will be pop out

I have my USB cable connected to target board debug USB
One thing is very unclear to me is how to define the port number, let me know how to configure this, thanks?

[SivaRamaKrishnaNV]

Dear @tingguang.wang1,
Do you see NVIDIA devices in lsusb output when host is connected to target’s debug port?

Please check using below command for serial connection from host.
For Tegra A: sudo minicom -D /dev/ttyUSB2
For Tegra B: sudo minicom -D /dev/ttyUSB6
For Aurix : sudo minicom -D /dev/ttyUSB3

Make sure to have below setting in minicom for each port

Bps/Par/Bits: 115200 8N1
Hardware Flow Control: No
Software Flow Control: No

Please see https://docs.nvidia.com/drive/drive-os-5.2.6.0L/drive-os/index.html#page/DRIVE_OS_Linux_SDK_NGC_Development_Guide/MCU%20Setup%20and%20Configuration/mcu_uart.html#wwpID0EZHA for reference

[tingguang.wang1]

I will have following USB info once connect the cable

[SivaRamaKrishnaNV]

Yes. Board is detected. Please try the commands I suggested

[tingguang.wang1]

it works.
The tricky thing was 1 default configuration need to be changed(hardware flow control)
I have tried for USB0 and 1 before seeing your last message.

Now account nvidia can be logged in.
I guess I should follow to the next step

[tingguang.wang1]

Hello

I was able to light up the display by installing the gdm3
But issue will happen after operation like switching camera/reboot, display will gone, even etc/dgm3/custom.conf is gone
is it a known issue? dgm can’t be restart properly since then and it seems I have to reflash to fix this issue