Serial console about TX2NX and NX

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
1

Hello,I have additional questions about the content of the link.
Continuing the discussion from About a / b Bootloader:

Q1. Does the serial console indicate the debug port (UART # 2)?

Q2. Is a message output to the serial console when a Cboot error occurs? Or do I need to check the registers from the debug port?

Q3. If you get an error message, can you tell me the characters?

Q4. In Xavier NX and TX2 NX, can I judge from the debug port when failing before Cboot (MB1, MB2)?

3

hello sakata-s,

Q1
please access Jetson Xavier NX Product Design Guide, you may refer to [Figure 12-5. Jetson Xavier NX UART Connections].
it’s using pin-203/pin-205 for serial console communications by default.
so, the serial console means the UART general, the UART-1 to transmit/receive the logs.

Q2
it’ll output logs no matter its error logs or information logs, there’s an index to indicate the log types,
for example,
I> means the information; W> to indicate warning logs, and E> shows an error logs.

[0000.335] I> Default Heap @ [0xd486400 - 0xd48a400]
[0000.336] E> DEVICE_PROD: Invalid value data = 70020000, size = 0.
[0000.342] W> device prod register failed

Q3
following above, you’ll the the error logs in the serial console.

Q4
it depends on the failure, normally it should report the errors before problematic.

4

Thank you for reply.
Regarding Q1, it is said that you connect to UART-1 to check the bootloader log, but for what purpose is UART-2 used? Devkit’s J14 pin is connected to UART-2.
Best regards.

5

hello sakata-s,

please check [Figure 12-5. Jetson Xavier NX UART Connections], it’s debug UART.
for Jetson Xavier NX, it’s pin-3 and pin-4 respectively for UART Receive and Send of J14,
pin-3 and pin-4 were UART2_TXD,UART2_RXD / UART3_TX,UART3_RX =pin 236,238, the port is mapping to ttyTHS2.

6

Thank you for reply.
Are the debug UART and bootloader logs different ports?

7

hello sakata-s,

Xavier series using combine uart, bootloader and kernel logs dump into general uart port.
please consider debug UART as another port to check the board info, thanks

8

Thank you for reply. For Jetson Nano, is the boot loader log output from UART2 (Debug port)?

9

hello sakata-s,

no, that’s the same. UART2 used for debug purpose.
it’s pin-203/205 for UART-1 routed to 40-pin expansion header on DevKit to output console logs, i.e. bootloader and also kernel logs.
please also check Nano’s product design guide for reference,
thanks

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