Index: boot/genarch/ofw.c
===================================================================
--- boot/genarch/ofw.c	(revision 63cda71efb0a2f95861470401dbc781d7f284896)
+++ boot/genarch/ofw.c	(revision fcf907e132925e88117f57b22cfbc44d5c2dafa3)
@@ -75,5 +75,13 @@
 }
 
-
+/** Perform a call to OpenFirmware client interface.
+ *
+ * @param service String identifying the service requested.
+ * @param nargs Number of input arguments.
+ * @param nret Number of output arguments. This includes the return value.
+ * @param rets Buffer for output arguments or NULL. The buffer must accommodate nret - 1 items.
+ *
+ * @return Return value returned by the client interface.
+ */
 static unsigned long ofw_call(const char *service, const int nargs, const int nret, ofw_arg_t *rets, ...)
 {
@@ -82,5 +90,5 @@
 	int i;
 	
-	args.service = service;
+	args.service = (ofw_arg_t) service;
 	args.nargs = nargs;
 	args.nret = nret;
Index: boot/genarch/ofw.h
===================================================================
--- boot/genarch/ofw.h	(revision 63cda71efb0a2f95861470401dbc781d7f284896)
+++ boot/genarch/ofw.h	(revision fcf907e132925e88117f57b22cfbc44d5c2dafa3)
@@ -47,18 +47,18 @@
  */
 typedef struct {
-	const char *service;		/**< Command name */
-	unsigned long nargs;		/**< Number of in arguments */
-	unsigned long nret;		/**< Number of out arguments */
-	ofw_arg_t args[MAX_OFW_ARGS];	/**< List of arguments */
+	ofw_arg_t service;		/**< Command name. */
+	ofw_arg_t nargs;		/**< Number of in arguments. */
+	ofw_arg_t nret;			/**< Number of out arguments. */
+	ofw_arg_t args[MAX_OFW_ARGS];	/**< List of arguments. */
 } ofw_args_t;
 
 typedef struct {
 	void *start;
-	unsigned int size;
+	uint32_t size;
 } memzone_t;
 
 typedef struct {
-	unsigned int total;
-	unsigned int count;
+	uint32_t total;
+	uint32_t count;
 	memzone_t zones[MEMMAP_MAX_RECORDS];
 } memmap_t;
@@ -66,25 +66,25 @@
 typedef struct {
 	void *addr;
-	unsigned int width;
-	unsigned int height;
-	unsigned int bpp;
-	unsigned int scanline;
+	uint32_t width;
+	uint32_t height;
+	uint32_t bpp;
+	uint32_t scanline;
 } screen_t;
 
 typedef struct {
 	void *addr;
-	unsigned int size;
+	uint32_t size;
 } keyboard_t;
 
 typedef struct {
-	unsigned int info;
-	unsigned int addr_hi;
-	unsigned int addr_lo;
+	uint32_t info;
+	uint32_t addr_hi;
+	uint32_t addr_lo;
 } pci_addr_t;
 
 typedef struct {
 	pci_addr_t addr;
-	unsigned int size_hi;
-	unsigned int size_lo;
+	uint32_t size_hi;
+	uint32_t size_lo;
 } pci_reg_t;