doc/SPL/README.spl-secure-boot

   1 Overview of SPL verified boot on powerpc/mpc85xx & arm/layerscape platforms
   2 ===========================================================================
   3
   4 Introduction
   5 ------------
   6
   7 This document provides an overview of how SPL verified boot works on powerpc/
   8 mpc85xx & arm/layerscape platforms.
   9
  10 Methodology
  11 -----------
  12
  13 The SPL image is responsible for loading the next stage boot loader, which is
  14 the main u-boot image. For secure boot process on these platforms ROM verifies
  15 SPL image, so to continue chain of trust SPL image verifies U-boot image using
  16 spl_validate_uboot(). This function uses QorIQ Trust Architecture header
  17 (appended to U-boot image) to validate the U-boot binary just before passing
  18 control to it.