Debug log by uart2 halt during booting

Autonomous Machines Jetson & Embedded Systems Jetson Nano
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1

Hi everyone:
I used uart cable connect to uart2 in nano devkit ,it can output log but halt ,it is asked to input acount and password. after input acount and password ,it just enter to bash ,the uart log can not output. what do need to modify to make uart continue output from booting to enter system.THanks.
THe picture is uart log show and halt during booting

uart_halt1
uart_halt11152×571 28.7 KB
uart_halt2
uart_halt21100×475 18.9 KB

3

hello jz_leetop,

may I know which JetPack release version you’re working with,
may I also know the exactly pin you’d connected to for gather uart logs.
thanks

4

Hi JerryChang:
I am working with jetpack4.3 .i connect to UART2_RXD (DEBUG) /UART1_TXD (DEBUG) in nano module to gather uart logs

5

don’t you connect Tx/Rx to the same UART port for communication?
for example, according to Nano J41 Header Pinout, you should wiring with pin-8, pin-10 and also GND to setup serial port.
thanks

6

Hi Jerry chang:
my uart cable ‘RX to TX in nano ,uart cable’ TX to RX in nano.

7

Hi jz_leetop,

Have you clarified the cause and resolved the problem?
Any result can be shared?

8

Hi ,
fixed by step as below:
1. Modify /boot/extlinux/extlinux.conf on Nano.
Remove “quiet” string.
2. Reboot
3. After Linux boot complete
echo 8 > /proc/sys/kernel/printk # to set loglevel