Open Source Summit North America 2022

Ever wondered how you push a button and swiftly you are being taken to the Phone login screen, or the Linux desktop? The modern Linux system is no less than IronMan, and the transition from the start button to home screen is as exciting as IronMan suit up scene.  All the Linux action takes place on a battleground called "Main Memory" which is initialized by the bootloader. The bootloader also loads and sets up the preface for the Linux image to boot.  Like the IronMan suit is different for different type of crisis situation, the Linux Image indeed wears a different suit based on the "Device Tree Blob(dtb)". We shall see how much support Linux offers in describing and parsing the dtb. We shall discuss when and how the dtb is parsed, and the sequence that follows.  Like the core of the IronMan suit powers the Ironman, we shall witness how multiple cores that runs a Linux system are initialized and powered up in the Linux.  After the cores are fully powered up, we shall prepare the Armory Systems to fire. Here we discuss the initialization of other subsystems in Linux like timers, clocks, pinmux, and the serial console. Post the system H/W initialization, what follows are the user processes which draw the required home screen and the IronMan suit up is deemed to be complete!