FDT parameter doesn’t have effect in extlinux.conf

[limeng-linux]

I have a Orin AGX board, it has 64G emmc.
And I build yocto project for Orin AGX board
git clone https://github.com/OE4T/tegra-demo-distro.git
cd tegra-demo-distro
git checkout master
git submodule update --init
. ./setup-env --machine p3737-0000-p3701-0005 build-jetson-agx-orin-devkit
bitbake demo-image-sato

after building project, I burn Image into board, and then system boots up normally

I open the /boot/extlinux/extlinux.conf file and add below code
FDT /boot/dtb/tegra234-p3737-0000+p3701-0005-nv.dtb
But I found out that the FDT parameter doesn’t have effect, it still gets dtb from configuration table
EFI stub: Using DTB from configuration table
Could you please tell me how use my dtb file?

Another question, I know the dtb from configuration table is a full feature dtb, my dtb tegra234-p3737-0000+p3701-0005-nv.dtb is a basic one. Could you please tell me how to generate a dtb that is the same with the one from configuration table ?

thanks,
LImeng

[madisongh]

The EFI stub: Using DTB from configuration table message is from the Linux kernel, and it just says that EFI passed it the device tree. This is expected - it's the L4TLauncher EFI application that reads the extlinux.conf file. It should be trying to load the one configured there, and if successful, that should replace the copy in the kernel-dtb partition, or the copy that's bundled into UEFI.

If L4TLauncher isn't loading your device tree, there may be a message about it as part of the UEFI output on the serial console. If there isn't, you may need to use a debug build of UEFI to find out more.