===== drivers/video/aty/aty128fb.c 1.52 vs edited =====
--- 1.52/drivers/video/aty/aty128fb.c	2004-11-12 11:40:39 -08:00
+++ edited/drivers/video/aty/aty128fb.c	2004-12-13 15:13:55 -08:00
@@ -791,6 +791,7 @@
 static void __init aty128_unmap_ROM(struct pci_dev *dev, void __iomem * rom)
 {
 	struct resource *r = &dev->resource[PCI_ROM_RESOURCE];
+	u32 val;
 	
 	iounmap(rom);
 	
@@ -801,8 +802,9 @@
 		r->end -= r->start;
 		r->start = 0;
 	}
-	/* This will disable and set address to unassigned */
-	pci_write_config_dword(dev, dev->rom_base_reg, 0);
+	/* This will disable it again */
+	pci_read_config_dword(dev, dev->rom_base_reg, &val);
+	pci_write_config_dword(dev, dev->rom_base_reg, val & ~PCI_ROM_ADDRESS_ENABLE);
 }
 
 
@@ -830,8 +832,10 @@
 	
 	/* enable if needed */
 	if (!(r->flags & PCI_ROM_ADDRESS_ENABLE)) {
+		u32 val;
+		pci_read_config_dword(dev, dev->rom_base_reg, &val);
 		pci_write_config_dword(dev, dev->rom_base_reg,
-				       r->start | PCI_ROM_ADDRESS_ENABLE);
+				       val | PCI_ROM_ADDRESS_ENABLE);
 		r->flags |= PCI_ROM_ADDRESS_ENABLE;
 	}
 	
===== drivers/video/aty/radeon_base.c 1.35 vs edited =====
--- 1.35/drivers/video/aty/radeon_base.c	2004-11-11 00:39:04 -08:00
+++ edited/drivers/video/aty/radeon_base.c	2004-12-13 15:11:56 -08:00
@@ -265,6 +265,7 @@
 {
 	// leave it disabled and unassigned
 	struct resource *r = &dev->resource[PCI_ROM_RESOURCE];
+	u32 val;
 	
 	if (!rinfo->bios_seg)
 		return;
@@ -277,8 +278,9 @@
 		r->end -= r->start;
 		r->start = 0;
 	}
-	/* This will disable and set address to unassigned */
-	pci_write_config_dword(dev, dev->rom_base_reg, 0);
+	/* This will disable it again */
+	pci_read_config_dword(dev, dev->rom_base_reg, &val);
+	pci_write_config_dword(dev, dev->rom_base_reg, val & ~PCI_ROM_ADDRESS_ENABLE);
 }
 
 static int __devinit radeon_map_ROM(struct radeonfb_info *rinfo, struct pci_dev *dev)
@@ -310,8 +312,10 @@
 	
 	/* enable if needed */
 	if (!(r->flags & PCI_ROM_ADDRESS_ENABLE)) {
+		u32 val;
+		pci_read_config_dword(dev, dev->rom_base_reg, &val);
 		pci_write_config_dword(dev, dev->rom_base_reg,
-				       r->start | PCI_ROM_ADDRESS_ENABLE);
+				       val | PCI_ROM_ADDRESS_ENABLE);
 		r->flags |= PCI_ROM_ADDRESS_ENABLE;
 	}