View source for Jetson/TX2 DTB


Starting on Jetson TX2, the '''Device Tree Binary''' (DTB) is no longer specified by default in /boot/extlinux/extlinux.conf.  This is to allow u-boot to pass parameter to load the specific DTB file.  However if you have compiled your own DTB, there are ways to set it yourself.<br>
Please refer to the steps according to your JetPack release version.

== R27.1 ==
=== Modifying the Existing extlinux.conf ===

Although L4T by default no longer sets the FDT entry in extlinux.conf, users can still manually set this for the change to take effect.  Note the DTB field added back into /boot/etxlinux/extlinux.conf below:

   TIMEOUT 30
   DEFAULT primary
   MENU TITLE p2771-0000 eMMC boot options
   LABEL primary
      MENU LABEL primary kernel
      LINUX /boot/Image
      '''FDT /boot/tegra186-quill-p3310-1000-c03-00-base.dtb'''
      APPEND fbcon=map:0 net.ifnames=0 console=tty0 OS=l4t console=ttyS0,115200n8 memtype=0 video=tegrafb no_console_suspend=1 earlycon=uart8250,mmio32,0x03100000 gpt tegraid=18.1.2.0.0 tegra_keep_boot_clocks maxcpus=6 android.kerneltype=normal androidboot.serialno=0335115020673 vpr_resize root=/dev/mmcblk0p1 rw rootwait

=== Before Flashing ===

The default DTB can also be set before flashing by modifying jetson-tx2.conf located inside ../Linux_for_Tegra_tx2 directory on the host PC.  Set the path to the desired DTB in jetson-tx2.conf, then proceed with flashing.

If extlinux.conf is also edited with FDT option, then extlinux.conf will override what is specified in jetson-tx2.conf at the time of flashing.

== R28.1 ==

Replace the dtb file with your own build, and update the DTB with the following commands.

=== TX1 ===
Replace your own build DTB with
 JetPack/3.1/64_TX1/Linux_for_Tegra_64_tx1/kernel/dtb/tegra210-jetson-tx1-p2597-2180-a01-devkit.dtb
flash the DTB partition with
 sudo ./flash -r -k DTB jetson-tx1 mmcblk0p1
=== TX2 ===
Replace your own build DTB with
 [TX2]
 JetPack/3.1/64_TX2/Linux_for_Tegra_64_tx2/kernel/dtb/tegra186-quill-p3310-1000-[a00|c03]-00-base.dtb
 [TX2i]
 JetPack/3.1/64_TX2/Linux_for_Tegra_64_tx2/kernel/dtb/tegra186-quill-p3489-1000-a00-00-ucm1.dtb
flash the DTB partition with
 sudo ./flash -r -k kernel-dtb jetson-tx2 mmcblk0p1

== Discussion Thread ==

# [https://devtalk.nvidia.com/default/topic/1001443 extlinux.conf: FDT No Longer Used for DTB File Specification?]
# [https://devtalk.nvidia.com/default/topic/1020708 method to modify/use different device tree in R28.1]