Jetson 36.2 RT Kernel Installation not detecting USBs

[trekar9907]

Hi,

I tried to install Jetson 36.2 RT Kernel, and it seems to be well installed until i reach the ubuntu login, doesn’t work neither the keyboard nor the mouse.
The keyboard works because at boot menu i can access boot manager and setup.

But at ubuntu login doesn’t work:

I compiled kernel and modules using Driver Package (BSP) Sources and Sample Root Filesystem. And followed Kernel Customization — NVIDIA Jetson Linux Developer Guide 1 documentation steps.

And for installation:

@DaveYYY

Replace /boot/Image to update the kernel. Put kernel modules into /lib/modules/($uname -r)/.

[DaveYYY]

Are USB devices detected in dmesg when you log in via serial console?
List every steps you did for kernel compilation/installation.

[trekar9907]

hey, i put down the steps that i followed tell me if u see something. This week I do not have physical access to the board, when I have it I will do the dmesg with the serial console

1. Download sources to get kernel source code

• The way to do it with git does not work  the servers are usually down.

https://docs.nvidia.com/jetson/archives/r36.2/DeveloperGuide/SD/Kernel/KernelCustomization.html#to-manually-download-and-expand-the-kernel-sources
to. Jetson Linux Archive | NVIDIA Developer.
b. Download Driver Package (BSP) Sources

• wget https://developer.nvidia.com/downloads/embedded/l4t/r36_release_v2.0/sources/public_sources.tbz2
• wget https://developer.nvidia.com/downloads/embedded/l4t/r36_release_v2.0/release/tegra_linux_sample-root-filesystem_r36.2.0_aarch64.tbz2

2. Unzip source code and rootfs
   c. Extract the .tbz2 file:
   $ tar xf public_sources.tbz2 -C /Linux_for_Tegra/…
   d. Extract the kernel and the NVIDIA out-of-tree modules source files:
   $ cd /Linux_for_Tegra/source
   $ tar xf kernel_src.tbz2
   $ tar xf kernel_oot_modules_src.tbz2
   $ tar xf nvidia_kernel_display_driver_source.tbz2
   This extracts the kernel source to the kernel/ subdirectory, and the NVIDIA out-of-tree kernel modules sources to the current directory.
3. Activate RT

• $./generic_rt_build.sh “enable”

4. Compile kernel

• cd /Linux_for_Tegra/source
• ./generic_rt_build.sh “enable”
• make -C kernel
• export INSTALL_MOD_PATH=/Linux_for_Tegra/rootfs/
  o If the rootfs folder does not exist, create it
• sudo -E make install -C kernel
• cp kernel/kernel-jammy-src/arch/arm64/boot/Image \ /Linux_for_Tegra/kernel/Image
  o If the kernel folder does not exist, create it
• Possible error: fatal error: openssl/opensslv.h: No such file or directory
  o Solution: sudo apt-get install libssl-dev

5. Compile modules

• cd /Linux_for_Tegra/source
• export IGNORE_PREEMPT_RT_PRESENCE=1
• export KERNEL_HEADERS=$PWD/kernel/kernel-jammy-src
• make modules
• sudo -E make modules_install

6. INSTALLATION (CRITICAL STEP)

• Replace Linux_for_Tegra/kernel/Image for /boot/Image
• Replace Linux_for_Tegra/rootfs/lib/modules/$(uname -r) for /lib/modules/$(uname -r)

[DaveYYY]

@trekar9907

sudo -E make install -C kernel

This installs the in-tree kernel modules.

@trekar9907

sudo -E make modules_install

This install the OOT kernel modules.

@trekar9907

Replace Linux_for_Tegra/rootfs/lib/modules/$(uname -r) for /lib/modules/$(uname -r)

So this one is not required. Actually I don’t even know what exactly you did here.
There is no single folder called /lib/modules/ in the kernel source tree even after compilation.

[trekar9907]

I only followed this steps:

@DaveYYY

Replace /boot/Image to update the kernel. Put kernel modules into /lib/modules/($uname -r)/.

Do you think is the reason that doesnt detect keyboard and mouse?

[DaveYYY]

@DaveYYY

So this one is not required. Actually I don’t even know what exactly you did here.
There is no single folder called /lib/modules/ in the kernel source tree even after compilation.

Answer me here.

[DaveYYY]

Anyway, if you just cannot get it done, JetPack 6 GA comes with pre-built RT kernel as Debian packages, and you don’t have to build it yourself.

[trekar9907]

Oh okay! but JetPack 6 GA it’s not released yet, right?

[DaveYYY]

Scheduled in early May.

[trekar9907]

I’m trying again the installation but without replacing /lib/modules. To be sure:

1. With Jetson 6 DP installation is necessary to cp the image to /boot/Image?
2. If i’m compiling kernel natively, the var is INSTALL_MOD_PATH=/Linux_for_Tegra/rootfs/ or INSTALL_MOD_PATH=/ ??

[DaveYYY]

Answer to both your questions are YES.

[trekar9907]

To second question YES means that INSTALL_MOD_PATH is Linux_for_tegra/rootfs/ or / ???

[DaveYYY]

Of course it’s /.
Also, it’s better you name the new kernel image differently, and specify it in extlinux.conf.
So if it fails to load, you still have the stock kernel which should work properly.

[trekar9907]

Okay, now the instalation worked :) Thanks.