Index: sys/usb/src.km/ucd/ethernat/ethernat_int.S
===================================================================
RCS file: /mint/freemint/sys/usb/src.km/ucd/ethernat/ethernat_int.S,v
retrieving revision 1.1
diff -u -8 -p -r1.1 ethernat_int.S
--- sys/usb/src.km/ucd/ethernat/ethernat_int.S	29 Apr 2011 11:39:28 -0000	1.1
+++ sys/usb/src.km/ucd/ethernat/ethernat_int.S	15 Feb 2013 07:28:03 -0000
@@ -37,16 +37,18 @@
 #define _cpld_cr		0x80000023	// Ethernat cpld control reg
 
 	.globl _old_int
 	.globl _interrupt
 	.globl _ethernat_int
 	.globl _set_old_int_lvl
 	.globl _set_int_lvl6
 	.globl _hook_reset_vector
+	.globl _ethernat_probe_asm,
+	.globl _ethernat_probe_c
 
 	.text
 
 	dc.l	0x58425241		// XBRA
 	dc.l	0x00000000		// (no cookie)
 _old_int:
 	ds.l	1
 _interrupt:
@@ -97,12 +99,34 @@ oldreset:
 newreset:
 	move.b	_cpld_cr,d0
 	and.b	0xF9,d0			//0xFB USB, 0xF9 USB+ETH 
 	move.b	d0,_cpld_cr
 	move.l	oldreset,_resvector
 	move.l	oldvalid,_resvalid
 	jmp	(a6)
 
-	.bss
 oldvalid:
 	.ds.l	1
 
+// Change bus error exception handler
+// Call probe function
+// Enable again the old bus error handler
+_ethernat_probe_asm:
+	movem.l	a0-a7/d0-d7,-(sp)
+	move.w	sr,-(sp)
+	move.l	8,old_berr
+	lea	berr,a0
+	move.l	a0,8
+	move.l	sp,old_stack
+	bsr	_ethernat_probe_c
+berr:
+	move.l	old_berr,8
+	move.l	old_stack,sp
+	move.w	(sp)+,sr
+	movem.l	(sp)+,d0-d7/a0-a7
+	rts
+
+old_stack:
+	ds.l	1
+old_berr:
+	ds.l	1
+
Index: sys/usb/src.km/ucd/ethernat/ethernat_int.h
===================================================================
RCS file: /mint/freemint/sys/usb/src.km/ucd/ethernat/ethernat_int.h,v
retrieving revision 1.1
diff -u -8 -p -r1.1 ethernat_int.h
--- sys/usb/src.km/ucd/ethernat/ethernat_int.h	29 Apr 2011 11:39:28 -0000	1.1
+++ sys/usb/src.km/ucd/ethernat/ethernat_int.h	15 Feb 2013 07:28:03 -0000
@@ -31,9 +31,16 @@ extern void (*old_int)(void);
 
 // interrupt wrapper routine
 void interrupt(void);
 void hook_reset_vector(void);
 
 void set_old_int_lvl(void);
 void set_int_lvl6(void);
 
+/* 
+ * To know if the EtherNat is present through the bus error
+ */
+void ethernat_probe_asm(void);
+void ethernat_probe_c(void);
+
+
 #endif // _ethernat_int_h
Index: sys/usb/src.km/ucd/ethernat/isp116x-hcd.c
===================================================================
RCS file: /mint/freemint/sys/usb/src.km/ucd/ethernat/isp116x-hcd.c,v
retrieving revision 1.1
diff -u -8 -p -r1.1 isp116x-hcd.c
--- sys/usb/src.km/ucd/ethernat/isp116x-hcd.c	29 Apr 2011 11:39:28 -0000	1.1
+++ sys/usb/src.km/ucd/ethernat/isp116x-hcd.c	15 Feb 2013 07:28:04 -0000
@@ -58,16 +58,17 @@
  */
 
 #include <stddef.h>
 #include <mint/osbind.h> /* Setexc */
 
 #include "mint/mint.h"
 #include "libkern/libkern.h"
 #include "mint/dcntl.h"
+#include "mint/arch/asm_spl.h" /* spl() */
 
 #include "../../config.h"
 #include "../../endian/io.h"
 #include "../../usb.h"
 #include "../ucd_defs.h"
 #include "ethernat_int.h"
 
 #define VER_MAJOR	0
@@ -175,16 +176,17 @@ struct ucdinfo	*uinf;
 /****************************************************************************/
 
 
 struct isp116x isp116x_dev;
 struct isp116x_platform_data isp116x_board;
 static long got_rhsc;		/* root hub status change */
 struct usb_device *devgone;	/* device which was disconnected */
 static long rh_devnum;		/* address of Root Hub endpoint */
+static int found = 0;
 
 /*
  * interrupt handling - bottom half
  */
 void _cdecl 	ethernat_int 	(void);
 /*
  * interrupt handling - top half
  */
@@ -1921,27 +1923,49 @@ usb_lowlevel_stop(void)
 	struct isp116x *isp116x = &isp116x_dev;
 
 	if (!isp116x->disabled)
 		isp116x_stop(isp116x);
 
 	return 0;
 }
 
+void
+ethernat_probe_c (void)
+{
+	if (!((*ETHERNAT_CPLD_CR) == (*ETHERNAT_CPLD_CR)))
+		return;
+
+	found = 1;
+}
+
 long _cdecl
 init (struct kentry *k, struct ucdinfo *uinfo, char **reason)
 {
 	long ret;
+	short sr;
 
 	kentry	= k;
 	uinf	= uinfo;
 
 	if (check_kentry_version())
 		return -1;
 
+	/* Check that the Ethernat card can be found */
+	sr = spl7 ();
+	ethernat_probe_asm();
+	spl (sr);
+
+	if(!found)
+	{
+		c_conws ("\n\r\033pEtherNat not found!\033q\n\n\r");
+		DEBUG (("EtherNat not found!"));
+		return -1;
+	}
+
 	c_conws (MSG_BOOT);
 	c_conws (MSG_GREET);
 	DEBUG (("%s: enter init", __FILE__));
 
 	ret = (*uinf->ucd_register)(&ethernat_uif);
 	if (ret)
 	{
 		DEBUG (("%s: ucd register failed!", __FILE__));