diff --git a/src/include/device/device.h b/src/include/device/device.h
index 0b15ac5..b44a551 100644
--- a/src/include/device/device.h
+++ b/src/include/device/device.h
@@ -2,11 +2,12 @@
 #define DEVICE_H
 
 #include <stdint.h>
+#include <stddef.h>
 #include <device/resource.h>
 #include <device/path.h>
 
-
 struct device;
+#ifndef __PRE_RAM__
 typedef struct device * device_t;
 struct pci_operations;
 struct pci_bus_operations;
@@ -42,12 +43,14 @@
 	const struct smbus_bus_operations *ops_smbus_bus;
 	const struct pci_bus_operations *ops_pci_bus;
 };
+#endif
 
 
 struct bus {
-	device_t 	dev;		/* This bridge device */
-	device_t 	children;	/* devices behind this bridge */
-	struct bus	*next;		/* The next bridge on this device */
+
+	ROMSTAGE_CONST struct device * 	dev;		/* This bridge device */
+	ROMSTAGE_CONST struct device * 	children;	/* devices behind this bridge */
+	ROMSTAGE_CONST struct bus	*next;		/* The next bridge on this device */
 	unsigned	bridge_ctrl;	/* Bridge control register */
 	unsigned char	link_num;	/* The index of this link */
 	uint16_t	secondary; 	/* secondary bus number */
@@ -70,10 +73,12 @@
 };
 
 struct device {
-	struct bus *	bus;		/* bus this device is on, for bridge
+	ROMSTAGE_CONST struct bus *	bus;		/* bus this device is on, for bridge
 					 * devices, it is the up stream bus */
-	device_t	sibling;	/* next device on this bus */
-	device_t	next;		/* chain of all devices */
+
+	ROMSTAGE_CONST struct device *	sibling;	/* next device on this bus */
+
+	ROMSTAGE_CONST struct device *	next;		/* chain of all devices */
 
 	struct device_path path;
 	unsigned 	vendor;
@@ -89,23 +94,24 @@
 	u8 command;
 
 	/* Base registers for this device. I/O, MEM and Expansion ROM */
-	struct resource *resource_list;
+	ROMSTAGE_CONST struct resource *resource_list;
 
 	/* links are (downstream) buses attached to the device, usually a leaf
 	 * device with no children has 0 buses attached and a bridge has 1 bus
 	 */
-	struct bus *link_list;
+	ROMSTAGE_CONST struct bus *link_list;
 
 	struct device_operations *ops;
 	const struct chip_operations *chip_ops;
-	void *chip_info;
+	ROMSTAGE_CONST void *chip_info;
 };
 
 /**
  * This is the root of the device tree. The device tree is defined in the
  * static.c file and is generated by the config tool at compile time.
  */
-extern struct device	dev_root;
+extern ROMSTAGE_CONST struct device	dev_root;
+#ifndef __PRE_RAM__
 extern struct device	*all_devices;	/* list of all devices */
 
 extern struct resource	*free_resources;
@@ -195,5 +201,10 @@
 
 void tolm_test(void *gp, struct device *dev, struct resource *new);
 u32 find_pci_tolm(struct bus *bus);
-
+#else
+ROMSTAGE_CONST struct device * dev_find_slot (unsigned int bus,
+						unsigned int devfn);
+ROMSTAGE_CONST struct device * dev_find_slot_on_smbus (unsigned int bus,
+							unsigned int addr);
+#endif
 #endif /* DEVICE_H */