See the handoff from immutable boot code to bootloader, kernel, device tree, userspace and the final application.
Embedded Linux startup is a chain of handoffs. When a system fails to boot, locating the last successful handoff dramatically narrows the diagnostic surface.
Boot failures are easiest to isolate by handoff boundary.
Device tree belongs to the hardware description path.
Userspace health cannot compensate for an incomplete kernel/device initialization.
SoC immutable code
U-Boot / firmware
Drivers + hardware
Userspace startup
Networking • IPC
Product behavior
The diagram is intentionally architectural rather than vendor-specific. Use it as a mental model, then map the components to the actual environment.
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