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X399 Post Confirmation

Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=9266
Printed Date: 01 Nov 2025 at 7:31am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com


Topic: X399 Post Confirmation
Posted By: ssmith335
Subject: X399 Post Confirmation
Date Posted: 29 Jul 2018 at 1:55am
Its my understanding that when a motherboard boots it checks all hardware for functionality; memory, MB, etc., and won't boot until all are deemed functional, etc. 

ssmith335


Replies:
Posted By: kerberos_20
Date Posted: 29 Jul 2018 at 5:56pm
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Quote Aptio Boot Flow
Aptio 5.x core follows the firmware model described by the UEFI Platform Initialization Specification (PI).
 The PI Specification refers the following "boot phases" which may apply to various checkpoint and beep code descriptions:
- Security (SEC) - initial low-level initialization
- Pre-EFI Initialization (PEI) - memory initialization (Analogous to "bootblock" functionality of legacy BIOS)
- Driver Execution Environment (DXE) - main hardware initialization (Analogous to "POST" functionality in legacy BIOS)
- Boot Device Selection (BDS) - system setup, pre-OS user interface & selecting a bootable device (CD/DVD, HDD, USB, Network, Shell, ...


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