diff -ur linux-2.2.19/arch/alpha/kernel/bios32.c linux-2.2.19.dp264/arch/alpha/kernel/bios32.c
--- linux-2.2.19/arch/alpha/kernel/bios32.c	Sun Mar 25 20:31:46 2001
+++ linux-2.2.19.dp264/arch/alpha/kernel/bios32.c	Wed Jun  6 15:35:09 2001
@@ -125,6 +125,9 @@
 void __init
 pcibios_fixup_bus(struct pci_bus *bus)
 {
+	if (alpha_mv.pci_fixup_bus) {
+		alpha_mv.pci_fixup_bus(bus);
+	}
 }
 
 int
diff -ur linux-2.2.19/arch/alpha/kernel/sys_dp264.c linux-2.2.19.dp264/arch/alpha/kernel/sys_dp264.c
--- linux-2.2.19/arch/alpha/kernel/sys_dp264.c	Sun Mar 25 20:31:46 2001
+++ linux-2.2.19.dp264/arch/alpha/kernel/sys_dp264.c	Wed Jun  6 15:35:27 2001
@@ -14,6 +14,7 @@
 #include <linux/sched.h>
 #include <linux/pci.h>
 #include <linux/init.h>
+#include <linux/malloc.h>
 
 #include <asm/ptrace.h>
 #include <asm/system.h>
@@ -388,6 +389,60 @@
 }
 
 static void __init
+dp264_pci_fixup_bus(struct pci_bus *bus)
+{
+	struct pci_dev *dev, *next;
+
+	unsigned int mask = 0;
+	for (dev = bus->devices; dev; dev = dev->sibling) {
+		mask |= 1 << (dev->devfn >> 3);
+	}
+
+	/* analyze the mask */
+	if (mask == 0xffffffff) { /* Oops!!! */
+		/* disable everything with except of IdSel 7 */
+		/* which is known to be a problematic slot */
+		/* with a 64 bit cards such as 3COM 3c985 */
+		/* !!! NEVER use bus 0 idsel 7 with such cards!!! */
+		printk("dp264_pci_fixup_bus: WARNING: Phantom device occupies entire bus %d - only IdSel 7 enabled.\n", bus->number);
+		mask &= 0xffffff7f; 
+	} else {
+		/* disable everyting with except of valid */
+		/* IdSels 5 - 10 - some 64bit cards */
+		/* detects twice - once with valid IdSel */
+		/* and secondly with invalid IdSel */
+		mask &= 0xfffff81f;
+	}
+		
+	for (dev = bus->devices; dev; dev = next) {
+		next = dev->sibling;
+		if (mask & (1 << (dev->devfn >> 3))) {
+			unsigned short cmd;
+			struct pci_dev *fixup;
+			
+			printk("dp264_pci_fixup_bus: Disabling \"phantom\" device at %02x:%02x.%02x [%04x/%04x]\n",
+			    dev->bus->number, dev->devfn >> 3, dev->devfn & 7, dev->vendor, dev->device);
+				    
+			/* disable this device to avoid problems */
+			pcibios_read_config_word(dev->bus->number, 
+				dev->devfn, PCI_COMMAND, &cmd);
+			cmd &= (~PCI_COMMAND_IO & ~PCI_COMMAND_MEMORY & ~PCI_COMMAND_MASTER);
+			pcibios_write_config_word(dev->bus->number,
+				dev->devfn, PCI_COMMAND, cmd);
+					
+			/* delete from the list of devices */
+			/* fixup devices */
+			for (fixup = pci_devices; fixup; fixup = fixup->next) {
+			        if (fixup->next == dev) fixup->next = dev->next;
+				if (fixup->sibling == dev) fixup->sibling = dev->sibling;
+			}
+			/* free memory */
+			kfree(dev);
+		}
+	}
+}
+
+static void __init
 monet_pci_fixup(void)
 {
 	layout_all_busses(DEFAULT_IO_BASE, DEFAULT_MEM_BASE);
@@ -438,6 +493,7 @@
 	init_irq:		dp264_init_irq,
 	init_pit:		generic_init_pit,
 	pci_fixup:		dp264_pci_fixup,
+	pci_fixup_bus:		dp264_pci_fixup_bus,
 	kill_arch:		generic_kill_arch,
 };
 ALIAS_MV(dp264)
diff -ur linux-2.2.19/include/asm-alpha/machvec.h linux-2.2.19.dp264/include/asm-alpha/machvec.h
--- linux-2.2.19/include/asm-alpha/machvec.h	Sun Mar 25 20:31:06 2001
+++ linux-2.2.19.dp264/include/asm-alpha/machvec.h	Wed Jun  6 15:34:11 2001
@@ -88,6 +88,7 @@
 	void (*init_irq)(void);
 	void (*init_pit)(void);
 	void (*pci_fixup)(void);
+	void (*pci_fixup_bus)(void *);
 	void (*kill_arch)(int, char *);
 
 	const char *vector_name;