The Yocto project has a handy tool called ksize. Something like 1 Do this in command line, 2 Do this and this 3 Modify this and this in config. NoteIn general, you need to have root access and then install the required packages. Thus, you typically do not need to uncomment these variables in your local. The filesystem image has two tarball forms: ext3 and tar.
Who Should Attend: This course is designed for engineers who are developing advanced applications based on embedded Linux. I originally reviewed Leave Open, but I guess marking this as a duplicate of that is the right way to go. The tool prints tables identifying the size of individual kernel parts. In most cases simple monitoring of the serial port from a host system is accurate enough. If this is the case, 's fsck hook can be removed. Despite its widespread and growing adoption, the Yocto Project is one of the more misunderstood of Linux technologies. Digi Embedded Yocto includes the kernel source as well as device tree configuration files.
Without 's fsck hook, systemd will still fsck any relevant filesystems with the systemd-fsck. Kernel Configuration In order to support tethering, the following kernel configuration options need to be enabled either as modules m or builtin y : Category : , Booting a device as fast as possible is not only a requirement for time critical applications but also an important facet for improving the usability and user experience. If there are many interdependent processes in play, can be used to inspect those dependencies and reorder their priorities. The course provides advanced training in the design, development, debugging, profiling, testing, performance measurement, and optimization of embedded Linux applications including detailed memory management approaches for embedded systems and deployment considerations for embedded Linux applications software. Digi Embedded Yocto is designed to improve your time to market with common and simple to use software features that work out of the box.
I also use Revo Uninstaller for cleaning junk files. Note If you attempt to use a distribution not in the above list, you may or may not have success. In this little series of blog posts, I aim to have a look at what can be done about size and performance for the minimal core image that comes with the system. This makes it hard to strip down systemd to a bare minimum. The course focuses on acquiring an understanding of the basic Linux Operating System, highlighting areas of concern for embedded Linux applications development with a focus on embedded development. Early start for services One central feature of systemd is and socket activation. Compiling a custom kernel Compiling a custom kernel can reduce boot time and memory usage.
By default, the OpenEmbedded build system sets these variables based on the number of processor cores your build host uses. It helped us to decrease the size of U-Boot to 366kB and shaved away another 10ms. When the Yocto image is built, the U-Boot image is also built with it. This slows down the boot speed, and on most consumer hardware provides no benefits at all since the drives will already spin-up immediately when the power is turned on. Ergo, it may be safely removed. These happened for me a lot of time since I used different kernels to compile for different machines. User Space Init Process: One obvious optimization is to configure the Start of the critical application as soon as possible, of course after starting dependencies.
Then start the optimization with systemd-analyze! Note For information on running a memory-resident , see the setup script. This article is generally applicable to all of our modules. I agree the mentioned lines are not very important in a product and hence good candidate to omit. In the scheme of things, the kernel and u-boot are only very small parts of the build process so removing them likely won't make much difference. Before starting the optimization, we need an appropriate method to measure the boot time. Throughout the course, attendees will learn about the complete Yocto Project build process and customizations, how to add custom hardware definitions, and how to customize the Linux software stack. Having built and started the system, I get a boot time of 11.
This is a big plus and a good reason to use older hardware for development and testing since all the drivers have already been reviewed and upstreamed. Thus, if you need a fast boot, cut as much software from the init sequence as possible. Prerequisites: Basic understanding of C programming, Linux and script writing. Subsequent builds run much faster since parts of the build are cached. You can use it to cross compile applications to run on Digi embedded platforms. If your system does not meet any of these three listed version requirements, you can take steps to prepare the system so that you can still use the build system. Downloading the Filesystem You can also download the filesystem image suitable for your target architecture from.