fix(bl31): avoid clearing of argument registers in RESET_TO_BL31 case
It was assumed that BL31 is the first bootloader to run so there's
no argument to relay from a previous bootloader in RESET_TO_BL31
case, however this is not true for every platform with a non-TF-A
bootloader that might get executed before BL31 while compiling in
RESET_TO_BL31 feature.
Thus, by avoiding zeroing registers, the arguments passed from the
previous bootloader to BL31 are preserved.
Change-Id: I7bb66a10d1fd551ba3fd59a7a38ab5bde3197f72
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/bl31/aarch64/bl31_entrypoint.S b/bl31/aarch64/bl31_entrypoint.S
index ed05864..dfb14e9 100644
--- a/bl31/aarch64/bl31_entrypoint.S
+++ b/bl31/aarch64/bl31_entrypoint.S
@@ -66,17 +66,6 @@
_init_c_runtime=1 \
_exception_vectors=runtime_exceptions \
_pie_fixup_size=BL31_LIMIT - BL31_BASE
-
- /* ---------------------------------------------------------------------
- * 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
- * arguments passed to the platform layer to reflect that.
- * ---------------------------------------------------------------------
- */
- mov x20, 0
- mov x21, 0
- mov x22, 0
- mov x23, 0
#endif /* RESET_TO_BL31 */
/* --------------------------------------------------------------------