Agx devkit can't use uart1, during system boot phase

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
#1

agx devkit uart is used by uart1, and 40-pin Expansion Header are pin 6/8/10.
uart only use when system is started, but uart is no log during system boot when power is on.

I already test cases:
1、when flash jp4.6.2, uart only use when system prompt is appeared;
2、when flash jp5.0.2, uart have few log when booting and lost most log until system is started.

agx_devkit_boot_jp502
agx_devkit_boot_jp5021026×983 52.9 KB

maybe uart is disabled or uart is switched during boot.
please check the root cause and solve it.

#3

hello samwise.yang,

what’s your actual use-case, are you going to check bootloader logs?
AGX Xavier is using combined uart, you may setup connections with port J501, a micro-USB connector which provides access to the UART console.

#4

yes, I want to check bootloader log.
micro-usb is the uart console and actually ttyUSB3 is OK.

Thanks a lot.