jetson-nano-support

SPI

The spi directory contains dtb and u-boot binaries for the DevKit with part number p3448-0000-p3449-0000-a02 as well as the patch files used to create them. Together they enable spi1 on the 40-pin connector and create a device node for /dev/spidev0.0.

Unlike earlier install methods, you can install the binaries on a running Nano without the need for any other downloads, compiling, etc.

The latest release contains a tarball which, when extracted and run on the Nano, will update the appropriate partitions.

Extract the tarball then change to the directory created. Run sudo ./flashme.sh /dev/mmcblk0 (assuming /dev/mmcblk0 contains the system partitions) Reboot and you should have the spidev0.0 device.

NOTE: This program doesn't touch any other partitions or files so it's safe to run on an existing customized filesystem. The program will also make sure that the needed partitions are already on the device before it writes anything.

You can also run this program on any other computer to update an SDCard that's not currently in a Nano. The above note still applies.

Customization

The patches that created the DTB and u-boot binaries are included here. You'll need to follow the instructions in the Nvidia documentation for customizing the DTBs and u-boot.

If you want to create your own flash package you can use the scripts in the flash directory.

• Use the Nvidia documentation to create your DTB and u-boot images.
  Follow the instructions to copy the DTBs to your Linux_for_Tegra/kernel/dtb directory, and your u-boot.bin file to Linux_for_Tegra/bootloader/t210ref/p3450-porg/ directory.

• Copy create-signed-partitions.sh and create-flash-package.sh to your Linux_for_Tegra directory.

• From your Linux_for_Tegra directory, run sudo ./create-signed-partitions.sh -r 200 where "200" is the board rev id for the "a02" boards. Adjust as necessary. This command will apply the DTBs to the appropriate partition blobs and sign the partition blobs. They'll be located in bootloader/signed directory.

• From your Linux_for_Tegra directory, run ./create-flash-package.sh. You don't need to be root for this command. When it's done (it'll be very quick) you should have a /tmp/flash-dtb-update-.tar.gz file that you can copy to any Nano and execute as above.