[Jetson Nano eMMC sku 0002] [L4T 32.7.2] Uart log via ttyUSB0 is not showing during boot

[anhhao.hcmus]

Hi Nvidia team.

I’m using Jetson Nano devkit B01 + SOM eMMC SKU0002.
I’m trying to flash and expect to see serial log during boot. However, it didn’t show anything. Device able to bootup and access via /dev/ttyACM0.

I tried to replace SOM with

1. SOM A02 → console serial showing booting log (sudo ./flash.sh -x 0x21 jetson-nano-qspi-sd mmcblk0p1)
2. SOM B01 → same with SOM eMMC SKU0002. (sudo ./flash.sh -x 0x21 jetson-nano-emmc mmcblk0p1)

Could someone help me? am I missing any configurations?

log_emmc.txt (17.6 KB)

[WayneWWW]

How is your connection to dump uart log here?

[anhhao.hcmus]

Hi I connect pin 3,4,7 in 12-Pin Button Header

[WayneWWW]

Could you cross check other carrier board too? If you are sure the system can boot up, then UART log shall be printed automatically, no software configuration is needed.