Build system:Board level control of no-unaligned-access

boards/nxp/fmurt1062-v1/nuttx-config/Kconfig

@@ -30,3 +30,12 @@ config BOARD_USE_PROBES
 	---help---
 		Select to use GPIO FMU-CH1-8, as PROBE_1-8 to provide timing signals
 		from selected drivers.
+
+config BOARD_FORCE_ALIGNMENT
+	bool "Forces all acesses to be Aligned"
+	default n
+
+	---help---
+		Adds -mno-unaligned-access to build flags. to force alignment.
+		This can be needed if data is stored in a region of memory, that
+		is Strongly ordered and dcache is off.

platforms/nuttx/NuttX/Make.defs.in

@@ -116,6 +116,11 @@ FLAGS = $(MAXOPTIMIZATION) -g2 \
 
 FLAGS += $(EXTRAFLAGS)
 
+# force alignment
+ifeq ($(CONFIG_BOARD_FORCE_ALIGNMENT),y)
+	FLAGS += -mno-unaligned-access
+endif
+
 # enable precise stack overflow tracking
 ifeq ($(CONFIG_ARMV7M_STACKCHECK),y)
 	FLAGS += -finstrument-functions -ffixed-r10

platforms/nuttx/cmake/px4_impl_os.cmake

@@ -86,6 +86,13 @@ function(px4_os_add_flags)
 		)
 	endif()
 
+	if("${CONFIG_BOARD_FORCE_ALIGNMENT}" STREQUAL "y")
+		message(STATUS "Board forcing alignment")
+		add_compile_options(
+			-mno-unaligned-access
+		)
+	endif()
+
 endfunction()
 
 #=============================================================================