D26725.diff
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	Index: head/sys/arm/arm/machdep.c
	===================================================================
	--- head/sys/arm/arm/machdep.c
	+++ head/sys/arm/arm/machdep.c
	@@ -1111,6 +1111,8 @@
	char *env;
	void *kmdp;
	int err_devmap, mem_regions_sz;
	+ phandle_t root;
	+ char dts_version[255];
	#ifdef EFI
	struct efi_map_header *efihdr;
	#endif
	@@ -1272,6 +1274,18 @@
	err_devmap);

	platform_late_init();
	+
	+ root = OF_finddevice("/");
	+ if (OF_getprop(root, "freebsd,dts-version", dts_version, sizeof(dts_version)) > 0) {
	+ if (strcmp(LINUX_DTS_VERSION, dts_version) != 0)
	+ printf("WARNING: DTB version is %s while kernel expects %s, "
	+ "please update the DTB in the ESP\n",
	+ dts_version,
	+ LINUX_DTS_VERSION);
	+ } else {
	+ printf("WARNING: Cannot find freebsd,dts-version property, "
	+ "cannot check DTB compliance\n");
	+ }

	/*
	* We must now clean the cache again....