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The system startup stage on embedded Linux system starts by executing the firmware / program on the on-chip boot ROM, which then load bootloader / operating system from the storage device like eMMC, eUFS, NAND flash, etc. [5] The sequences of system startup are varies by processors [5] but all include hardware initialization and system hardware ...
Many modern CPUs, SoCs and microcontrollers (for example, TI OMAP) or sometimes even digital signal processors (DSPs) may have a boot ROM integrated directly into their silicon, so such a processor can perform a simple boot sequence on its own and load boot programs (firmware or software) from boot sources such as NAND flash or eMMC. It is ...
Once all the boot and system drivers have been loaded, the kernel starts the session manager (smss.exe), which begins the login process. After the user has successfully logged into the machine, winlogon applies User and Computer Group Policy setting and runs startup programs declared in the Windows Registry and in "Startup" folders. [5]
In x86 computers, a first-stage bootloader is a compact 512-byte program that resides in the master boot record (MBR) and executes when a computer starts. Running in 16-bit real mode at address 0x7C00, it performs minimal hardware initialization, sets up a basic execution environment, and locates the second-stage bootloader.
ginitd, a software package that consists of an init system and a service management system [15] Initng, a full replacement of init designed to start processes asynchronously; launchd, a replacement for init in Darwin/macOS/iOS/tvOS starting with Mac OS X v10.4 (it launches SystemStarter to run old-style 'rc.local' and SystemStarter processes)
It can disable or re-enable software, device drivers and Windows services that run at startup, or change boot parameters. It is bundled with all versions of Microsoft Windows operating systems since Windows 98 except Windows 2000. Windows 95 and Windows 2000 users can download the utility as well, although it was not designed for them. [1]
The term boot comes from the idea of lifting oneself by one's own bootstraps: [5] the computer contains a tiny program (bootstrap loader) which will load and run a program found on a boot device. This program may itself be a small program designed to load a larger and more capable program, i.e., the full operating system.
On system with BIOS firmware, the BIOS invokes MBR boot code from a hard disk drive at startup. The MBR boot code and the VBR boot code are OS-specific. In Microsoft Windows, the MBR boot code tries to find an active partition (the MBR is only 512 bytes), then executes the VBR boot code of an active partition.