xiaoxiang781216 commented on code in PR #16332:
URL: https://github.com/apache/nuttx/pull/16332#discussion_r2076996895
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tools/imx9/Config.mk:
##########
@@ -47,6 +47,13 @@ ifeq ($(CONFIG_IMX9_BOOTLOADER),y)
FCB_TOOL_PATH = $(BASE_PATH)$(FCB_TOOL)
EXTRAFLAGS += -mstrict-align
+# If we don't use MMU all memory is treated as device memory and can't handle
alignment faults.
+# Some compiler builtins like memset() can introduce alignment faults, so we
need to disable them
+# if we don't use the MMU.
+ifneq ($(CONFIG_ARCH_USE_MMU),y)
Review Comment:
let's move to common places for both cmake and makefile under arch/arm64/
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arch/arm64/src/imx9/imx9_boot.c:
##########
@@ -142,9 +142,11 @@ void arm64_chip_boot(void)
#endif
#endif
+#if defined(CONFIG_ARCH_USE_MMU)
Review Comment:
`#ifdef CONFIG_ARCH_USE_MMU`
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