diff --git a/source/chapter1-about.rst b/source/chapter1-about.rst index a8d3d55a55e5aef712ae7f86f71e58ae14ab787b..88878f6ef6533f3093e52024edb0f4b0c79ceced 100644 --- a/source/chapter1-about.rst +++ b/source/chapter1-about.rst @@ -64,9 +64,9 @@ without UEFI is outside the scope of this document. Refer to [#UEFICapsuleUpdateNote]_ for details. - We assume that our immutable stage loader can load the second stage boot loader (e.g TF-A) from a dual image. In case the masked ROM can not boot with an alternative location, similar functionality - **must** be added to the secondary bootloader stage. - In that case updating the secondary bootloader stage should be disallowed from OTA - update. In person update of secondary bootloader stage may be possible and may require extra + **must** be added to the secondary bootloader stage. In that case the secondary boot loader inherits all the + requirements of the first stage boot loader and the secondary bootloader stage is disallowed from OTA updates. + In person update of secondary bootloader stage may be possible and may require extra tools or procedures but that is out of the scope of this document. - Update process can target a single firmware component or multiple components. Updating multiple components and multiplexing boot combinations can be very challenging. In this document we treat