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-rw-r--r--doc/arch/sandbox.rst13
1 files changed, 13 insertions, 0 deletions
diff --git a/doc/arch/sandbox.rst b/doc/arch/sandbox.rst
index e111949..bc670b9 100644
--- a/doc/arch/sandbox.rst
+++ b/doc/arch/sandbox.rst
@@ -420,6 +420,19 @@ state_setprop() which does this automatically and avoids running out of
space. See existing code for examples.
+VPL (Verifying Program Loader)
+------------------------------
+
+Sandbox provides an example build of vpl called `sandbox_vpl`. This can be run
+using::
+
+ /path/to/sandbox_vpl/tpl/u-boot-tpl -D
+
+It starts up TPL (first-stage init), then VPL, then runs SPL and finally U-Boot
+proper, following the normal flow for a verified boot. At present, no
+verification is actually implemented.
+
+
Debugging the init sequence
---------------------------