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 ---
Changes PATCH v5->PATCH v6: Added README for SECURE BOOT support in SPL framework.
doc/SPL/README.spl-secure-boot | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 doc/SPL/README.spl-secure-boot
diff --git a/doc/SPL/README.spl-secure-boot b/doc/SPL/README.spl-secure-boot new file mode 100644 index 0000000..f2f8d78 --- /dev/null +++ b/doc/SPL/README.spl-secure-boot @@ -0,0 +1,18 @@ +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.