R36.3 Kernel Customization error

[tornado1100]

Hello,

I’m trying to customize jetson kernel for the purpose of boot time optimization. after running modules_install, when I tried to run sudo ./tools/l4t_update_initrd.sh

it gave the following response:

Using rootfs directory: /home/ubuntu/jetlin363/Linux_for_Tegra/rootfs
Updating the initrd: /home/ubuntu/jetlin363/Linux_for_Tegra/bootloader/l4t_initrd.img
Copy /home/ubuntu/jetlin363/Linux_for_Tegra/bootloader/l4t_initrd.img to /home/ubuntu/jetlin363/Linux_for_Tegra/rootfs/boot/initrd
Preparing virtual env
chroot: failed to run command 'nv-update-initrd': No such file or directory
ERROR: nv-update-initrd failed!
Cleaning up virtual env
umount: /home/ubuntu/jetlin363/Linux_for_Tegra/rootfs/dev: target is busy.

I cannot locate the nv-update-initrd file in Linux_for_Tegra folder, to setup the build environment, I followed the steps from Quick Start and Kernel Customization chapters of the online guide.

I did face some issues before while running modules_install,

first was due to not running the compile and install commands in the order given the Kernel Customization chapter (after compiling the kernel via make -C kernel, I compiled the external modules first via make modules, then tried to directly install external modules using sudo -E make modules install before install the kernel and in-tree modules).

Next issue that I faced was in signing of external modules, specifically - SSL error:FFFFFFFF80000002:system library::No such file or directory: ... , which I solved as given in this thread . Afterwards, the output showed installation and signing of modules within nvidia–ot, hwpm, nvdisplay and nvgpu folders, and the command ended without giving errors so I assume it went okay.

Now, I’m facing the issue stated at the beginning.

[DaneLLL]

Hi,
It should be in rootfs:

Linux_for_Tegra$ sudo find -name nv-update-initrd
./rootfs/var/lib/dpkg/triggers/nv-update-initrd
./rootfs/usr/sbin/nv-update-initrd
./rootfs/etc/nv-update-initrd

Probably you remove the files while customizing rootfs, or certain path is not set correctly.

[tornado1100]

Thank you for the reply,

I did not find it in rootfs, sudo find -name nv-update-initrd resulted in showing nothing.

Then I downloaded the Sample Root FS again from Jetson Linux, and ran sudo tar xpf ${SAMPLE_FS_PACKAGE} -C Linux_for_Tegra/rootfs/ , still nv-update-initrd is nowhere to be found. Am I downloading the correct files?

[DaneLLL]

Hi,
Please check if you execute all steps in

Quick Start — NVIDIA Jetson Linux Developer Guide 1 documentation

[tornado1100]

Thank you, I can locate the files after running sudo ./apply_binaries.sh in a fresh project. Does the sudo -E make install -C kernel or sudo -E make modules_install affect the complete rootfs directory? Also do I need to run apply_binaries.sh only once at the start or run after modifying kernel image as well?

[DaneLLL]

Hi,
Please follow the quick start section to make sure you can flash the developer kit. This is to confirm the files under Linux_for_Tegra is complete. And then do kernel customization.

[tornado1100]

Ok,

Thank you.