diff -urN -X linux-2.6.16/Documentation/dontdiff linux-2.6.16/drivers/edac/e752x_edac.c linux-2.6.16_edac/drivers/edac/e752x_edac.c
--- linux-2.6.16/drivers/edac/e752x_edac.c	2006-03-19 21:53:29.000000000 -0800
+++ linux-2.6.16_edac/drivers/edac/e752x_edac.c	2006-04-25 13:59:45.000000000 -0700
@@ -29,6 +29,7 @@
 
 #include "edac_mc.h"
 
+static int force_function_unhide = 0;
 
 #ifndef PCI_DEVICE_ID_INTEL_7520_0
 #define PCI_DEVICE_ID_INTEL_7520_0      0x3590
@@ -755,10 +756,19 @@
 	debugf0("MC: " __FILE__ ": %s(): mci\n", __func__);
 	debugf0("Starting Probe1\n");
 
-	/* enable device 0 function 1 */
+	/* check to see if device 0 function 1 is enbaled if it isn't we
+	 * assume the BIOS has reserved it for a reason and is expecting
+	 * exclusive access, we take care to not violate that assumption and
+	 * fail the probe. */
 	pci_read_config_byte(pdev, E752X_DEVPRES1, &stat8);
-	stat8 |= (1 << 5);
-	pci_write_config_byte(pdev, E752X_DEVPRES1, stat8);
+	if (!(stat8 & (1 << 5))) {
+		printk(KERN_INFO "contact your bios vendor to see if the " 
+		"E752x error registers can be safely un-hidden\n");
+		if (!force_function_unhide)
+			goto fail;
+	}
+        stat8 |= (1 << 5);
+        pci_write_config_byte(pdev, E752X_DEVPRES1, stat8);
 
 	/* need to find out the number of channels */
 	pci_read_config_dword(pdev, E752X_DRC, &drc);
@@ -1069,3 +1079,8 @@
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Linux Networx (http://lnxi.com) Tom Zimmerman\n");
 MODULE_DESCRIPTION("MC support for Intel e752x memory controllers");
+
+module_param(force_function_unhide, int, 0644);
+MODULE_PARM_DESC(force_function_unhide, "if BIOS sets Dev0:Fun1 up as hidden:"
+" 1=force unhide and hope BIOS doesn't fight driver for Dev0:Fun1 access");
+