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+# Part 2 - Secure boot
+
+## Abstract
+
+<!-- todo -->
+
+Domain          | Improvement
+--------------- | ----------------------------------------------------
+Boot-Abstract-1 | More generic and add examples (The chain of trust).
+
+<!-- endtodo -->
+
+**Boot Hardening**: Steps/requirements to configure the boot sequence, in order
+to restrict the device from executing anything other than the approved software
+image.
+
+In this part, we will see a series of settings that will allow us to improve
+security during boot phase. For the purposes of reference and explanation, we
+are providing guidance on how to configure an embedded device that runs with a
+3.10.17 Linux kernel. If the integrity is not checked or if a critical error
+occurs, the system must boot on a very stable backup image.
+
+**Requirements**: These requirements must be met even if an alternative version
+of the Linux kernel is chosen.
+
+**Recommendations**: Detailed best practices that should be applied in order to
+secure a device. Although they are not currently listed as hard requirements,
+they may be upgraded to requirements status in the future. In addition, specific
+operators may change some of these recommendations into requirements based on
+their specific needs and objectives.
+
+<!-- todo -->
+
+Domain          | Improvement
+--------------- | -------------------------------------------
+Boot-Abstract-1 | Review the definition of the "boot loader".
+
+<!-- endtodo -->
+
+**Boot loader**: The boot loader consists of the Primary boot loader residing
+in **OTP** memory, sboot, U-Boot and Secure loader residing in external flash
+(NAND or SPI/NOR flash memory). The CPU on power on or reset executes the
+primary boot loader. The **OTP** primary boot loader makes the necessary initial
+system configuration and then loads the secondary boot loader sboot from
+external flash memory to ram memory. The sboot then loads the U-Boot along with
+the Secure loader. U-Boot then verifies the Kernel/system image integrity, then
+loads the Kernel/system image before passing control to it.
+
+--------------------------------------------------------------------------------
+
+## Acronyms and Abbreviations
+
+The following table lists the terms utilized within this part of the document.
+
+Acronyms or Abbreviations | Description
+------------------------- | ---------------------------------
+_FUSE_                    | **F**ilesystem in **U**ser**S**pac**E**
+_OTP_                     | **O**ne-**T**ime-**P**rogrammable