When developing systems and application software with L4T, you run and test your code on an actual reference platform, such as the NVIDIA® Jetson Nano™ Developer Kit. Your code targets this hardware directly, rather than a software simulator or emulator.

Accordingly, you must acquire and set up your carrier board before using L4T. Consult your board documentation for guidance on setting up and configuring your board. See the sections below for additional notes.

This section provides additional notes that apply to the Jetson Developer Kit for specific Jetson modules.

This section describes hardware setup for NVIDIA® Jetson Nano™ devices.

Although the carrier board supports a variety of peripheral devices, start developing on L4T with a board that has the following:

The L4T Jetson Nano board layout and connections are shown in the following diagram.

This section describes hardware setup for NVIDIA® Jetson AGX Xavier™ devices.

Although the carrier board supports a variety of peripheral devices, start developing on L4T with a board that has the following:

The L4T Jetson AGX Xavier board layout and connections are shown in the following diagram.

This section describes hardware setup for NVIDIA® Jetson™ TX2 series devices: Jetson TX2, Jetson TX2i, and Jetson TX2 4GB.

Although the carrier board supports a variety of peripheral devices, start developing on L4T with a board that has the following:

 

To ensure the bluetooth software stack is conformant for the configuration, Bluetooth audio is disabled by default. If additional bluetooth audio profiles are enabled, product conformance may be impacted.

This section describes hardware setup for NVIDIA Jetson TX1 devices.

Although the carrier board supports a variety of peripheral devices, start developing on L4T with a board that has:

The Jetson TX1 carrier board is identical to the Jetson TX2 carrier board, shown in the Jetson TX2 section Platform Board Layout.

The voltage and current monitor work together with platform hardware to implement a system Electrical Design Point (EDP) management strategy which maximizes CPU and GPU performance within system EDP constraints for the platform.

A voltage comparator and a current monitor detect under-voltage and over-current scenarios. When the sensor outputs are asserted, the Jetson module throttles the CPU and GPU clocks as configured by software to reduce the current load.

The power monitor accepts configuration data from the powermon.dtsi (Device Tree) source file. The following sections give the location of this file, and a code snippet from it, for each platform supported.

The Jetson Nano module includes an on-board power monitor, the INA3221, to monitor the voltage and current of the following power rails:

The alert outputs of the INA3221 include:

The outputs are fed into a SOC_THERM input on the Jetson module. When one or more alert outputs are asserted, the SOC_THERM hardware reacts to reduce module power consumption and avoid violating current limits.

The powermon.dtsi file for the Jetson Nano module is located at:

The following code snippet is from this file:

The Jetson AGX Xavier module includes an on-board power monitor, the INA3221, to monitor the voltage and current of the following power rails:

The alert outputs of the INA3221 include:

The outputs are fed into a SOC_THERM input on the Jetson module. When one or more alert outputs are asserted, the SOC_THERM hardware reacts to reduce module power consumption and avoid violating current limits.

The powermon.dtsi file for the Jetson AGX Xavier module is located at:

The following code snippet is from this file:

The Jetson TX2 and Jetson TX2i modules each include an on-board power monitor, the INA3221, to monitor the voltage and current of the following power rails:

The alert outputs of the INA3221 include:

The outputs are fed into a SOC_THERM input on the Jetson module. When one or more alert outputs are asserted, the SOC_THERM hardware reacts to reduce module power consumption and avoid violating current limits.

By default, the Jetson TX2 or Jetson TX2i developer kit’s critical current limit of VDD_IN is set to the maximum possible value of 8190 mA. Therefore, it is not necessary to modify the critical current for lower input voltage unless you want to configure the critical current limit for a specific input voltage.

The powermon.dtsi file for the Jetson TX2 module is located at:

The following code snippet is from this file:

The e file for the Jetson TX2i module is located at:

The following code snippet is from this file:

Jetson TX1 modules have an on-board power monitor, the INA3221, to monitor the voltage and current of the following power rails:

The alert outputs of the INA3221 include:

The outputs are fed into a SOC_THERM input on the Jetson module. When one or more alert outputs are asserted, the SOC_THERM hardware responds by reducing module power consumption to avoid violating current limits.

The base powermon .dtsi file for the Jetson TX1 module is located at:

This file contains settings for INA channels 1 and 2.

The following code snippet is from this file:

The plugin manager powermon.dtsi file for the Jetson TX1 module is located at:

The following code snippet is from this file: