diff --git a/src/kernel/boot/platform/openfirmware/openfirmware.c b/src/kernel/boot/platform/openfirmware/openfirmware.c
index c71d6c36ed..5084b52627 100644
--- a/src/kernel/boot/platform/openfirmware/openfirmware.c
+++ b/src/kernel/boot/platform/openfirmware/openfirmware.c
@@ -10,12 +10,19 @@
 
 // OpenFirmware entry function
 static int (*gCallOpenFirmware)(void *) = 0; 
+int gChosen;
 
 
-void
+status_t
 of_init(int (*openFirmwareEntry)(void *))
 {
 	gCallOpenFirmware = openFirmwareEntry;
+
+	gChosen = of_finddevice("/chosen");
+	if (gChosen == OF_FAILED)
+		return B_ERROR;
+
+	return B_OK;
 }
 
 
@@ -395,7 +402,7 @@ of_release(void *virtual, int size)
 
 
 void *
-of_claim(void *virtual, int size)
+of_claim(void *virtual, int size, int align)
 {
 	struct {
 		const char	*name;
@@ -405,7 +412,7 @@ of_claim(void *virtual, int size)
 		int			size;
 		int			align;
 		void		*address;
-	} args = {"claim", 3, 1, virtual, size, 64};
+	} args = {"claim", 3, 1, virtual, size, align};
 
 	if (gCallOpenFirmware(&args) == OF_FAILED)
 		return NULL;
diff --git a/src/kernel/boot/platform/openfirmware/openfirmware.h b/src/kernel/boot/platform/openfirmware/openfirmware.h
index 8feb195e25..df4330b646 100644
--- a/src/kernel/boot/platform/openfirmware/openfirmware.h
+++ b/src/kernel/boot/platform/openfirmware/openfirmware.h
@@ -15,11 +15,17 @@
 extern int gChosen;
 
 
+struct of_region {
+	void	*base;
+	uint32	size;
+};
+
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-extern void of_init(int (*openFirmwareEntry)(void *));
+extern status_t of_init(int (*openFirmwareEntry)(void *));
 
 /* device tree functions */
 extern int of_finddevice(const char *device);
@@ -43,9 +49,10 @@ extern int of_seek(int handle, off_t pos);
 
 /* memory functions */
 extern int of_release(void *virtualAddress, int size);
-extern void *of_claim(void *virtualAddress, int size);
+extern void *of_claim(void *virtualAddress, int size, int align);
 
 /* misc functions */
+extern int of_call_method(const char *method, int numArgs, int numReturns, ...);
 extern int of_test(const char *service);
 extern int of_milliseconds(void);
 extern void of_exit(void);