Index: chipset_enable.c
===================================================================
--- chipset_enable.c	(revision 1253)
+++ chipset_enable.c	(working copy)
@@ -764,8 +764,50 @@
 
 static int enable_flash_ck804(struct pci_dev *dev, const char *name)
 {
+	uint32_t segctrl;
+	int segreg;
 	uint8_t old, new;
 
+	for (segreg = 0x8c; segreg <= 0x97; segreg += 4) {
+		segctrl = pci_read_long(dev, segreg);
+		if ((segctrl & 0x33333333) != 0x00000000) {
+			/* reads or writes are locked */
+			if ((segctrl & 0xcccccccc) == 0x00000000) {
+				/* we can unlock */
+				msg_pinfo("unlocking in %#02x\n", segreg);
+				pci_write_long(dev, segreg, 0x00000000);
+			} else {
+				msg_pinfo("can't unlock in %#02x\n", segreg);
+				programmer_may_write = 0;
+				return -1;
+			}
+		}
+		segctrl = pci_read_long(dev, segreg);
+		if ((segctrl & 0x33333333) != 0x00000000) {
+			msg_pinfo("still locked in %#02x (%#08x)\n",
+				  segreg, segctrl);
+			programmer_may_write = 0;
+			return -1;
+		}
+	}
+	segctrl = pci_read_byte(dev, 0x8a);
+	if ((segctrl & 0x3) != 0x0) {
+		if ((segctrl & 0xc) == 0x0) {
+			msg_pinfo("unlocking in %#02x\n", 0x8a);
+			pci_write_byte(dev, 0x8a, segctrl & 0xf0);
+		} else {
+			msg_pinfo("can't unlock in %#02x\n", 0x8a);
+			programmer_may_write = 0;
+			return -1;
+		}
+	}
+	segctrl = pci_read_byte(dev, 0x8a);
+	if ((segctrl & 0x3) != 0x0) {
+		msg_pinfo("still locked in %#02x (%#08x)\n", segreg, segctrl);
+		programmer_may_write = 0;
+		return -1;
+	}
+
 	old = pci_read_byte(dev, 0x88);
 	new = old | 0xc0;
 	if (new != old) {