Introduce SPIN_ON_BL1_EXIT build flag
This patch introduces a new build flag, SPIN_ON_BL1_EXIT, which
puts an infinite loop in BL1. It is intended to help debugging
the post-BL2 phase of the Trusted Firmware by stopping execution
in BL1 just before handing over to BL31. At this point, the
developer may take control of the target using a debugger.
This feature is disabled by default and can be enabled by
rebuilding BL1 with SPIN_ON_BL1_EXIT=1.
User Guide updated accordingly.
Change-Id: I6b6779d5949c9e5571dd371255520ef1ac39685c
diff --git a/bl1/aarch64/bl1_exceptions.S b/bl1/aarch64/bl1_exceptions.S
index 0bd0485..ee66ef0 100644
--- a/bl1/aarch64/bl1_exceptions.S
+++ b/bl1/aarch64/bl1_exceptions.S
@@ -207,6 +207,12 @@
bl disable_mmu_icache_el3
tlbi alle3
+#if SPIN_ON_BL1_EXIT
+ bl print_debug_loop_message
+debug_loop:
+ b debug_loop
+#endif
+
bl bl1_plat_prepare_exit
ldp x6, x7, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x30)]