What is the typical boot sequence from power-on to application launch?

What is the typical boot sequence from power-on to application launch?

• A. BIOS initializes hardware, then OS loads; kernel starts user apps.
• B. ROM loads bootstrap, bootloader loads from nonvolatile storage, kernel loads into memory and hands off to RTOS.
• C. Bootloader runs first, then RAM tests, then OS boots directly from microcode.
• D. Diagnostics run, then OS loads from network.

Answer: (B)

The essential idea is a layered startup: a small ROM-resident bootstrap initializes the minimal hardware and finds the next stage, a bootloader stored in nonvolatile memory is then loaded, that bootloader loads the OS kernel into RAM, and finally control is handed to the kernel which starts the RTOS and launches the application tasks. This sequence ensures reliable hardware setup, flexible update of the bootloader and kernel, and proper initialization of the real-time operating system before applications run. The other options describe PC-style boot (BIOS/OS handoff), an unrealistic microcode-only path, or a network-only diagnostic boot, which don’t reflect the typical embedded RTOS bootflow.

The essential idea is a layered startup: a small ROM-resident bootstrap initializes the minimal hardware and finds the next stage, a bootloader stored in nonvolatile memory is then loaded, that bootloader loads the OS kernel into RAM, and finally control is handed to the kernel which starts the RTOS and launches the application tasks. This sequence ensures reliable hardware setup, flexible update of the bootloader and kernel, and proper initialization of the real-time operating system before applications run. The other options describe PC-style boot (BIOS/OS handoff), an unrealistic microcode-only path, or a network-only diagnostic boot, which don’t reflect the typical embedded RTOS bootflow.