diff --git a/flash.h b/flash.h
index 51ce38b..bc0cc07 100644
--- a/flash.h
+++ b/flash.h
@@ -111,10 +111,12 @@
 #define W_49V002FA		0x32
 
 #define ST_ID			0x20	/* ST */
+#define ST_M50FW040		0x2C
 #define ST_M29F002B		0x34
 #define ST_M29F002T		0xB0	/* M29F002T / M29F002NT */
 #define ST_M29F400BT		0xD5
 #define ST_M29F040B		0xE2
+#define ST_M29W040B		0xE3
 
 #define EMST_ID			0x8c	/* EMST / EFST */
 #define EMST_F49B002UA		0x00
diff --git a/flashchips.c b/flashchips.c
index ec88d81..5e1a3af 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -114,6 +114,10 @@
 	 probe_jedec,	erase_chip_jedec, write_39sf020},
 	{"M29F002B",	ST_ID, 		ST_M29F002B,	256, 64 * 1024,
 	 probe_jedec,	erase_chip_jedec, write_jedec},
+	{"M50FW040",	ST_ID, 		ST_M50FW040,	512, 64 * 1024,
+	 probe_jedec,	erase_chip_jedec, write_jedec},
+	{"M29W040B",	ST_ID, 		ST_M29W040B,	512, 64 * 1024,
+	 probe_jedec,	erase_chip_jedec, write_jedec},
 	{"M29F002T/NT",	ST_ID, 		ST_M29F002T,	256, 64 * 1024,
 	 probe_jedec,	erase_chip_jedec, write_jedec},
 	{"M29F400BT",	ST_ID,		ST_M29F400BT,	512, 64 * 1024,