1.1. Boot Process
1.2. Boot Stages
1.3. Boot Devices
1.4. Second-Stage Boot Loader Support Package Generator Tool
1.5. Generating a Boot Loader with an External Flash Boot Device
1.6. Boot and FPGA Configuration
1.7. Boot Debugging
1.8. Appendix A: Building the UEFI Boot Loader
1.9. Revision History for Arria 10 SoC Boot User Guide
1.4.1.3. Step 3: Generating the Boot Loader Source
Click on the link in the "Related Information" below that corresponds to the type of external flash device you are using. Each of these links describe the steps for generating a boot loader for a given boot source.