of/flattree: Make unflatten_device_tree() safe to call from any arch
This patch makes unflatten_device_tree() safe to call from any arch
setup code with the following changes:
- Make sure initial_boot_params actually points to a device tree blob
before unflattening
- Make sure the initial_boot_params->magic field is correct
- If CONFIG_OF_FLATTREE is not set, then make unflatten_device_tree()
an empty static inline function.
This patch also adds some additional debug output to the top of
unflatten_device_tree().
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
index f0fdd1f..71e1a91 100644
--- a/include/linux/of_fdt.h
+++ b/include/linux/of_fdt.h
@@ -99,6 +99,8 @@
/* Other Prototypes */
extern void unflatten_device_tree(void);
extern void early_init_devtree(void *);
+#else /* CONFIG_OF_FLATTREE */
+static inline void unflatten_device_tree(void) {}
#endif /* CONFIG_OF_FLATTREE */
#endif /* __ASSEMBLY__ */