feat(bl31): aarch64: RESET_TO_BL31_WITH_PARAMS
It is not always the case that RESET_TO_BL31 enabled platforms don't
execute a bootloader before BL31.
For those use cases, being able to receive arguments from that first
loader (i.e: a DTB with TPM logs) might be necessary feature.
This code has been validated on iMX8mm.
Signed-off-by: Jorge Ramirez-Ortiz <jorge@foundries.io>
Change-Id: Ibf00c3867cb1d1012b8b376e64ccaeca1c9d2bff
diff --git a/bl31/aarch64/bl31_entrypoint.S b/bl31/aarch64/bl31_entrypoint.S
index ed05864..b0c46dc 100644
--- a/bl31/aarch64/bl31_entrypoint.S
+++ b/bl31/aarch64/bl31_entrypoint.S
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2013-2021, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2022, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -67,6 +67,7 @@
_exception_vectors=runtime_exceptions \
_pie_fixup_size=BL31_LIMIT - BL31_BASE
+#if !RESET_TO_BL31_WITH_PARAMS
/* ---------------------------------------------------------------------
* For RESET_TO_BL31 systems, BL31 is the first bootloader to run so
* there's no argument to relay from a previous bootloader. Zero the
@@ -77,6 +78,7 @@
mov x21, 0
mov x22, 0
mov x23, 0
+#endif /* RESET_TO_BL31_WITH_PARAMS */
#endif /* RESET_TO_BL31 */
/* --------------------------------------------------------------------