AGX module not powering up in OEM product

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
1

Hi:
I programmed an AGX module with Linux in a dev kit and tested it out. I also verifed a linux login on uart1 via the RasPi connection - I get a linux login prompt.

We removed the module/carrier from the dev kit and plugged it into our board. After power up, nothing coming out of uart1 or 2 header on the carrier. Module drawing 220mA at 12V.

We’ve checked a few pins - CARRIER_POWER_ON is high after power on. We didnt’ wire forced recovery to our system - it is pulled high in the GPU, correct?

Any other things we can check on our carrier?

Thanks
LArry

3

I wrote a startup script that saved thd kernel logs after each boot. The board is coming up ok - there’s just nothing on uart1. The uart signal passes from the Jetson to our main carrier and then out to a debug board with the peripheral headers. We missed something. Thanks.

4

You mean the system can boot up? Please share the log for check. Did you probe the UART1 pins with oscilloscope? Is there any signals coming out?

5

Thanks. Yes, system can start up OK per the log I looked at an nothing really interesting. The console login processes are started, just like on the dev board. Nothing coming on on UART1 TX line, but as I said, it makes hops from the Jetson to our main board and then out to the debug port board connectors.

We are leaving CTS/RTS floating on our system. I got login prompts on the dev kit with flow control off. Could the CTS/RTS need to set before the login process with transmit the prompt?

Thanks

larry

6

This got fixed this morning. The power control subsystem was bringing the Xavier out of reset before the Xavier’s power good signal was asserted.

Thanks
Larry