Platform Adaptation and Bring-Up
Jetson Nano Platform Adaptation and Bring-Up Guide DA_09361-002 | iii
Table of Contents
Platform Adaptation and Bring-Up ................................................. 1
Board Configuration ............................................................................. 1
Board Naming .................................................................................... 2
Placeholders in the Porting Instructions ...................................................... 2
Root Filesystem Configuration ................................................................. 3
Pinmux Changes ................................................................................. 3
Exporting Pinmux for U-Boot .................................................................. 4
Accessing GPIOs via “gpio” Device Labels ................................................... 6
Exporting Pinmux for the L4T Linux Kernel .................................................. 6
Porting U-Boot ................................................................................... 6
Porting the Linux Kernel ........................................................................ 7
Porting USB ...................................................................................... 9
USB Structure ................................................................................. 9
UPHY Lane Assignment ...................................................................... 9
Required Device Tree Changes ............................................................ 12
For a Host-Only Port ..................................................................... 12
For an OTG (On-The-Go) Port .......................................................... 16
Fan speed control mapping table ............................................................ 25
Other Considerations When Porting ......................................................... 26
Boot Time Reduction ........................................................................... 26
Root Filesystem .............................................................................. 26
Kernel ......................................................................................... 27
Hardware Bring-Up Checklist ................................................................. 27
Before Power-On ............................................................................ 28
Initial Power-On ............................................................................. 28
Initial Software Flashing .................................................................... 28
Power ......................................................................................... 29
Power Optimization ......................................................................... 29
USB 2.0 PHY ................................................................................. 29
USB 3.0 ....................................................................................... 30
HDMI .......................................................................................... 30
Audio .......................................................................................... 30
UART .......................................................................................... 30
SD Card (SDMMC1) ......................................................................... 31
Fan ............................................................................................ 31
Sensors I2C: General ....................................................................... 31
Sensors I2C: Touch Screen (Optional) .................................................... 31
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