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Sumit Garg ebfc066e6f doc: SPL: Add README for secure boot support 
Adds information regarding SPL handling validation process of main u-boot
image on power/mpc85xx and arm/layerscape platforms.

Signed-off-by: Sumit Garg <sumit.garg@nxp.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: York Sun <york.sun@nxp.com>
2016-07-21 11:11:29 -07:00
..
README.am335x-network doc, spl, am335x: update am335x-network 2016-06-09 13:53:10 -04:00
README.omap3 README.SPL: Move the 'Estimating stack usage' from omap3 to here 2012-09-02 19:39:46 +02:00
README.spl-secure-boot doc: SPL: Add README for secure boot support 2016-07-21 11:11:29 -07:00

README.spl-secure-boot 

Overview of SPL verified boot on powerpc/mpc85xx & arm/layerscape platforms
===========================================================================

Introduction
------------

This document provides an overview of how SPL verified boot works on powerpc/
mpc85xx & arm/layerscape platforms.

Methodology
-----------

The SPL image is responsible for loading the next stage boot loader, which is
the main u-boot image. For secure boot process on these platforms ROM verifies
SPL image, so to continue chain of trust SPL image verifies U-boot image using
spl_validate_uboot(). This function uses QorIQ Trust Architecture header
(appended to U-boot image) to validate the U-boot binary just before passing
control to it.