1. ECE 424 Embedded Systems Design Lecture 11: Embedded Platform Boot Sequence Chapter 6 Ning Weng

2. Introduction What is boot sequence? Why we care? 2 or 3 phases ─ BIOS/fireware: from processor reset vector ─ OS boot loader: from storage devices ─ OS Ning WengECE 4242

3. Multi-core/threads Boot Basic terms ─ Thread, core, package and SOC, Bootstrap processor (BSP), Aps Wait-for-SIPI state: wait for startup inter processor interrupt Ning WengECE 4243

4. Image Storage Technologies Ning WengECE 4244

5. S1: Power Sequencing Ning WengECE 4245

6. S2: Reset Reset vector: the location of these initial processor instructions ─ Inel 16 bytes Hardware and software reset Operation modes ─ Real ─ Flat protected mode ─ Segmented protected mode Ning WengECE 4246

7. S3: Early Initialization CPU and memory controller initialization ─ CPU ─ IA Microcode update ─ Device Initialization ─ Memory Configuration ─ Post-memory setup ─ Shadowing ─ AP Initialization Ning WengECE 4247

8. S4: Advanced Initialization Platform related initialization, peripheral-specific ─ GPIO ─ Interrupt/Cache controller ─ Timers ─ PCIe bus ─ Image storage … Ning WengECE 4248

9. S5: Boot Loader Identifying the image and handoff to the image See next slides for overall boot flow Ning WengECE 4249

10. Ning WengECE 42410

11. PXE (Networking Booting) Ning WengECE 42411

12. Announcement Read chapter 7 for OS overview Friday, 9/21 Exam 1 HW and Lab due Ning WengECE 42412