Kernel Boot Time Optimization

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano
1

Hi all,

I’m currently trying to reduce the boot time of my jetson nano down to around 3-4s. I’m following the L4T guide for R34.4.2 (I’m running jetpack 4.4). I’m trying to build a custom image on the jetson nano itself.

While following the guide there are some topics I couldn’t really figure out, they are:

  1. Disable console over UART
    In the guide, they mention that for the Nano platform I would need to edit the configuration file p3488-0000.conf but it was no where to be found in the kernel source.

  2. Secondary Bootloader
    Same issue, it says to edit the common configuration file at p2771-000.conf but I couldn’t find the file in the source.

Hopefully, anyone who has done something similar or have experience doing this can give me some pointers.

Thanks!

3
  1. Disable console over UART
    In the guide, they mention that for the Nano platform I would need to edit the configuration file p3488-0000.conf but it was no where to be found in the kernel source.
  2. Secondary Bootloader
    Same issue, it says to edit the common configuration file at p2771-000.conf but I couldn’t find the file in the source.

Because these files are not in kernel source. It is inside Linux_for_Tegra folder as a board config.
https://elinux.org/Jetson/General_debug

Also, p2771-0000.conf is for TX2 but not Nano.

5

Oh thanks alot!

Does this means that I have to compile a custom version of the kernel, modify the files on p3448.conf and flash it using the flash.sh script?

6

Hi,

Yes, I think so. What you should modify in p3448.conf should be only 1~2 lines. The remain customization should be in kernel.

8

@nicholas.leong Hello, could you share your image which boots only 3-4s? I attach a USB3 camera and it takes 40s+ before the camera is available when using the official image.