Index: sys/conf/files
===================================================================
--- sys/conf/files
+++ sys/conf/files
@@ -1494,6 +1494,7 @@
 dev/firewire/sbp_targ.c		optional sbp_targ
 dev/flash/at45d.c		optional at45d
 dev/flash/mx25l.c		optional mx25l
+dev/flash/flash_if.m		optional mx25l | at45d
 dev/fxp/if_fxp.c		optional fxp
 dev/fxp/inphy.c			optional fxp
 dev/gem/if_gem.c		optional gem
Index: sys/dev/flash/at45d.c
===================================================================
--- sys/dev/flash/at45d.c
+++ sys/dev/flash/at45d.c
@@ -137,6 +137,12 @@
 	return (err);
 }
 
+static uint64_t
+at45d_get_size(device_t dev){
+	struct at45d_softc* sc = device_get_softc(dev);
+	return sc->disk->d_mediasize;
+}
+
 static int
 at45d_get_mfg_info(device_t dev, uint8_t *resp)
 {
@@ -438,6 +444,7 @@
 	DEVMETHOD(device_attach,	at45d_attach),
 	DEVMETHOD(device_detach,	at45d_detach),
 
+	DEVMETHOD(flash_get_size, 	at45d_get_size),
 	DEVMETHOD_END
 };
 
Index: sys/dev/flash/flash_if.m
===================================================================
--- /dev/null
+++ sys/dev/flash/flash_if.m
@@ -0,0 +1,17 @@
+# $FreeBSD$
+
+# Flash chip interface description
+#
+
+#include <sys/bus.h>
+
+INTERFACE flash;
+
+# Get flash size
+#
+# Return values:
+#  size 
+#
+METHOD uint64_t get_size {
+	device_t dev;
+};
\ No newline at end of file
Index: sys/dev/flash/mx25l.c
===================================================================
--- sys/dev/flash/mx25l.c
+++ sys/dev/flash/mx25l.c
@@ -50,6 +50,8 @@
 
 #include <dev/spibus/spi.h>
 #include "spibus_if.h"
+#include "flash_if.h"
+
 
 #include <dev/flash/mx25lreg.h>
 
@@ -151,6 +153,12 @@
 	return (rxBuf[1]);
 }
 
+static uint64_t
+mx25l_get_size(device_t dev){
+	struct mx25l_softc* sc = device_get_softc(dev);
+	return sc->sc_disk->d_mediasize;
+}
+
 static void
 mx25l_wait_for_device_ready(device_t dev)
 {
@@ -626,6 +634,7 @@
 	DEVMETHOD(device_attach,	mx25l_attach),
 	DEVMETHOD(device_detach,	mx25l_detach),
 
+	DEVMETHOD(flash_get_size,   mx25l_get_size),
 	{ 0, 0 }
 };