buildroot/boot/mv-ddr-marvell/0001-Allow-access-to-low-addresses-with-gcc-12.patch

From 4796a1eacc6a5ccb623e7d2e46a5196f8335e496 Mon Sep 17 00:00:00 2001
From: Baruch Siach <baruch@tkos.co.il>
Date: Fri, 11 Aug 2023 11:19:49 +0300
Subject: [PATCH] Allow access to low addresses with gcc 12

gcc 12 added a warning that triggers on access to low addresses. Add a
compile option that allows access to lower addresses.

Add the 'cc_option' macro to avoid the compile option when the compiler
does not support it.

This fixes build with TF-A. TF-A added a similar fix in commit
dea23e245fb89.

See some more details in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105523

Upstream: https://github.com/MarvellEmbeddedProcessors/mv-ddr-marvell/pull/42
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
---
 Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Makefile b/Makefile
index 3f0dd89a7381..045284c30cbc 100644
--- a/Makefile
+++ b/Makefile
@@ -108,6 +108,10 @@ MV_DDR_VER_CSRC = mv_ddr_build_message.c
 # create mv_ddr build message and version string source file
 $(shell $(MV_DDR_ROOT)/scripts/localversion.sh $(MV_DDR_ROOT) $(MV_DDR_VER_CSRC) 2> /dev/null)
 
+define cc_option
+	$(shell if $(CC) $(1) -c -x c /dev/null -o /dev/null >/dev/null 2>&1; then echo $(1); fi )
+endef
+
 # ******************
 # U-BOOT SPL SUPPORT
 # ******************
@@ -331,6 +335,7 @@ OBJ_DIR ?= $(MV_DDR_ROOT)
 CFLAGS = -DMV_DDR_ATF -DCONFIG_DDR4
 CFLAGS += -Wall -Werror -Os -ffreestanding -mlittle-endian -g -gdwarf-2 -nostdinc
 CFLAGS += -march=armv8-a -fpie
+CFLAGS += $(call cc_option, --param=min-pagesize=0)
 
 # PLATFORM is set in ble/ble.mk
 ifneq ($(findstring a80x0,$(PLATFORM)),)
-- 
2.40.1