diff --git a/Makefile b/Makefile
index b9445b7..3b9432f 100644
--- a/Makefile
+++ b/Makefile
@@ -41,7 +41,7 @@
 LDFLAGS += -L/usr/local/lib
 endif
 
-CHIP_OBJS = jedec.o stm50flw0x0x.o w39v080fa.o sharplhf00l04.o w29ee011.o \
+CHIP_OBJS = jedec.o stm50flw0x0x.o w39v040c.o w39v080fa.o sharplhf00l04.o w29ee011.o \
 	sst28sf040.o m29f400bt.o 82802ab.o pm49fl00x.o \
 	sst49lfxxxc.o sst_fwhub.o flashchips.o spi.o
 
diff --git a/chipdrivers.h b/chipdrivers.h
index c5062ca..e262c2d 100644
--- a/chipdrivers.h
+++ b/chipdrivers.h
@@ -117,6 +117,7 @@
 int probe_49fl00x(struct flashchip *flash);
 int erase_49fl00x(struct flashchip *flash);
 int write_49fl00x(struct flashchip *flash, uint8_t *buf);
+int unlock_49fl00x(struct flashchip *flash);
 
 /* sharplhf00l04.c */
 int probe_lhf00l04(struct flashchip *flash);
@@ -145,6 +146,7 @@
 int erase_block_49lfxxxc(struct flashchip *flash, unsigned int address, unsigned int sector_size);
 int erase_chip_49lfxxxc(struct flashchip *flash, unsigned int addr, unsigned int blocksize);
 int write_49lfxxxc(struct flashchip *flash, uint8_t *buf);
+int unlock_49lfxxxc(struct flashchip *flash);
 
 /* sst_fwhub.c */
 int probe_sst_fwhub(struct flashchip *flash);
@@ -157,11 +159,13 @@
 int probe_w39v040c(struct flashchip *flash);
 int erase_w39v040c(struct flashchip *flash);
 int write_w39v040c(struct flashchip *flash, uint8_t *buf);
+int printlock_w39v040c(struct flashchip *flash);
 
 /* w39V080fa.c */
 int probe_winbond_fwhub(struct flashchip *flash);
 int erase_winbond_fwhub(struct flashchip *flash);
 int write_winbond_fwhub(struct flashchip *flash, uint8_t *buf);
+int unlock_winbond_fwhub(struct flashchip *flash);
 
 /* w29ee011.c */
 int probe_w29ee011(struct flashchip *flash);
diff --git a/flash.h b/flash.h
index 1474a38..1378b61 100644
--- a/flash.h
+++ b/flash.h
@@ -206,6 +206,8 @@
 		int (*block_erase) (struct flashchip *flash, unsigned int blockaddr, unsigned int blocklen);
 	} block_erasers[NUM_ERASEFUNCTIONS];
 
+	int (*printlock) (struct flashchip *flash);
+	int (*unlock) (struct flashchip *flash);
 	int (*write) (struct flashchip *flash, uint8_t *buf);
 	int (*read) (struct flashchip *flash, uint8_t *buf, int start, int len);
 
diff --git a/flashchips.c b/flashchips.c
index cfe9dba..875d5b3 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -49,6 +49,8 @@
 	 *	.eraseblocks[]	= Array of { blocksize, blockcount }
 	 *	.block_erase	= Block erase function
 	 * }
+	 * .printlock		= Chip lock status function
+	 * .unlock		= Chip unlock function
 	 * .write		= Chip write function
 	 * .read		= Chip read function
 	 */
@@ -3330,7 +3332,6 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_ZERO,	/* routine is wrapper to probe_jedec (pm49fl00x.c) */
-		/* .erase	= NULL, Was: erase_49fl00x */
 		.block_erasers	=
 		{
 			{
@@ -3344,6 +3345,7 @@
 				.block_erase = erase_chip_block_jedec,
 			}
 		},
+		.unlock		= unlock_49fl00x,
 		.write		= write_49fl00x,
 		.read		= read_memmapped,
 	},
@@ -3360,7 +3362,6 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_ZERO,	/* routine is wrapper to probe_jedec (pm49fl00x.c) */
-		/* .erase	= NULL, Was: erase_49fl00x */
 		.block_erasers	=
 		{
 			{
@@ -3374,6 +3375,7 @@
 				.block_erase = erase_chip_block_jedec,
 			}
 		},
+		.unlock		= unlock_49fl00x,
 		.write		= write_49fl00x,
 		.read		= read_memmapped,
 	},
@@ -4406,7 +4408,6 @@
 		.tested		= TEST_OK_PRW,
 		.probe		= probe_49lfxxxc,
 		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (sst49lfxxxc.c) */
-		/* .erase	= NULL, Was: erase_49flxxxc */
 		.block_erasers	=
 		{
 			{
@@ -4422,6 +4423,7 @@
 				.block_erase = erase_block_49lfxxxc,
 			}
 		},
+		.unlock		= unlock_49lfxxxc,
 		.write		= write_49lfxxxc,
 		.read		= read_memmapped,
 	},
@@ -5740,7 +5742,6 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_FIXME,
-		/* .erase	= NULL, Was erase_w39v040c */
 		.block_erasers	=
 		{
 			{
@@ -5751,6 +5752,7 @@
 				.block_erase = erase_chip_block_jedec,
 			}
 		},
+		.printlock	= printlock_w39v040c,
 		.write		= write_jedec_1,
 		.read		= read_memmapped,
 	},
@@ -5915,7 +5917,6 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_FIXME,
-		/* .erase	= NULL, Was erase_winbond_fwhub */
 		.block_erasers	=
 		{
 			{
@@ -5926,6 +5927,7 @@
 				.block_erase = erase_chip_block_jedec,
 			}
 		},
+		.unlock		= unlock_winbond_fwhub,
 		.write		= write_jedec_1,
 		.read		= read_memmapped,
 	},
@@ -5942,7 +5944,6 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_FIXME,
-		/* .erase	= NULL, Was erase_winbond_fwhub */
 		.block_erasers	=
 		{
 			{
@@ -5953,6 +5954,7 @@
 				.block_erase = erase_chip_block_jedec,
 			}
 		},
+		.unlock		= unlock_winbond_fwhub,
 		.write		= write_jedec_1,
 		.read		= read_memmapped,
 	},
diff --git a/flashrom.c b/flashrom.c
index b8de3c1..d67680a 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -838,6 +838,9 @@
 	       flash->vendor, flash->name, flash->total_size,
 	       flashbuses_to_text(flash->bustype), base);
 
+	if (flash->printlock)
+		flash->printlock(flash);
+
 	return flash;
 }
 
@@ -1147,12 +1150,18 @@
 				fprintf(stderr, "Continuing anyway.\n");
 			}
 		}
+		if (flash->unlock)
+			flash->unlock(flash);
+
 		if (erase_flash(flash)) {
 			emergency_help_message();
 			programmer_shutdown();
 			return 1;
 		}
 	} else if (read_it) {
+		if (flash->unlock)
+			flash->unlock(flash);
+
 		if (read_flash(flash, filename)) {
 			programmer_shutdown();
 			return 1;
@@ -1160,6 +1169,9 @@
 	} else {
 		struct stat image_stat;
 
+		if (flash->unlock)
+			flash->unlock(flash);
+
 		if (flash->tested & TEST_BAD_ERASE) {
 			fprintf(stderr, "Erase is not working on this chip "
 				"and erase is needed for write. ");
diff --git a/pm49fl00x.c b/pm49fl00x.c
index 9d104e2..e8c498d 100644
--- a/pm49fl00x.c
+++ b/pm49fl00x.c
@@ -36,6 +36,12 @@
 	}
 }
 
+int unlock_49fl00x(struct flashchip *flash)
+{
+	write_lockbits_49fl00x(flash->virtual_registers, flash->total_size * 1024, 0, flash->page_size);
+	return 0;
+}
+
 int erase_49fl00x(struct flashchip *flash)
 {
 	int i;
diff --git a/sst49lfxxxc.c b/sst49lfxxxc.c
index 80e5520..a65450e 100644
--- a/sst49lfxxxc.c
+++ b/sst49lfxxxc.c
@@ -82,6 +82,11 @@
 	return 0;
 }
 
+int unlock_49lfxxxc(struct flashchip *flash)
+{
+	return write_lockbits_49lfxxxc(flash, 0);
+}
+
 int erase_sector_49lfxxxc(struct flashchip *flash, unsigned int address, unsigned int sector_size)
 {
 	unsigned char status;
diff --git a/w39v040c.c b/w39v040c.c
index 66ab115..853419a 100644
--- a/w39v040c.c
+++ b/w39v040c.c
@@ -50,6 +50,32 @@
 	return 1;
 }
 
+int printlock_w39v040c(struct flashchip *flash)
+{
+	chipaddr bios = flash->virtual_memory;
+	uint8_t lock;
+
+	chip_writeb(0xAA, bios + 0x5555);
+	programmer_delay(10);
+	chip_writeb(0x55, bios + 0x2AAA);
+	programmer_delay(10);
+	chip_writeb(0x90, bios + 0x5555);
+	programmer_delay(10);
+
+	lock = chip_readb(bios + 0xfff2);
+
+	chip_writeb(0xAA, bios + 0x5555);
+	programmer_delay(10);
+	chip_writeb(0x55, bios + 0x2AAA);
+	programmer_delay(10);
+	chip_writeb(0xF0, bios + 0x5555);
+	programmer_delay(40);
+
+	printf("%s: Boot block #TBL is %slocked, rest of chip #WP is %slocked.\n",
+		__func__, lock & 0x4 ? "" : "un", lock & 0x8 ? "" : "un");
+	return 0;
+}
+
 int erase_w39v040c(struct flashchip *flash)
 {
 	int i;