From f86ca5ad8f780d306e79d49ffe4f5cf1edef37b9 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Sat, 30 Apr 2022 00:56:52 -0600 Subject: Introduce Verifying Program Loader (VPL) Add support for VPL, a new phase of U-Boot. This runs after TPL. It is responsible for selecting which SPL binary to run, based on a verified-boot process. Signed-off-by: Simon Glass --- doc/develop/spl.rst | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'doc/develop') diff --git a/doc/develop/spl.rst b/doc/develop/spl.rst index 1059b2fb9c0..aec7b562faa 100644 --- a/doc/develop/spl.rst +++ b/doc/develop/spl.rst @@ -83,7 +83,12 @@ U-Boot Phases U-Boot boots through the following phases: TPL - Very early init, as tiny as possible. This loads SPL. + Very early init, as tiny as possible. This loads SPL (or VPL if enabled). + +VPL + Optional verification step, which can select one of several SPL binaries, + if A/B verified boot is enabled. Implementation of the VPL logic is + work-in-progress. For now it just boots into SPL. SPL Secondary program loader. Sets up SDRAM and loads U-Boot proper. It may also -- cgit v1.2.3