diff --git a/flashchips.c b/flashchips.c
index 74b58ba..8bfd3cc 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -6322,6 +6322,22 @@
 
 	{
 		.vendor		= "Macronix",
+		.name		= "MX23L1654",
+		.bustype	= BUS_SPI,
+		.manufacture_id	= MACRONIX_ID,
+		.model_id	= MACRONIX_MX23L1654,
+		.total_size	= 2048,
+		.page_size	= 256,
+		.tested		= {.probe = NT, .read = NT, .erase = NA, .write = NA},
+		.probe		= probe_spi_rdid,
+		.probe_timing	= TIMING_ZERO,
+		.write		= NULL, /* MX23L1654 is a mask ROM, so it is read-only */
+		.read		= spi_chip_read, /* Fast read (0x0B) supported */
+		.voltage	= {3000, 3600},
+	},
+
+	{
+		.vendor		= "Macronix",
 		.name		= "MX23L3254",
 		.bustype	= BUS_SPI,
 		.manufacture_id	= MACRONIX_ID,
@@ -6338,6 +6354,38 @@
 
 	{
 		.vendor		= "Macronix",
+		.name		= "MX23L6454",
+		.bustype	= BUS_SPI,
+		.manufacture_id	= MACRONIX_ID,
+		.model_id	= MACRONIX_MX23L6454,
+		.total_size	= 8192,
+		.page_size	= 256,
+		.tested		= {.probe = NT, .read = NT, .erase = NA, .write = NA},
+		.probe		= probe_spi_rdid,
+		.probe_timing	= TIMING_ZERO,
+		.write		= NULL, /* MX23L6454 is a mask ROM, so it is read-only */
+		.read		= spi_chip_read, /* Fast read (0x0B) supported */
+		.voltage	= {3000, 3600},
+	},
+
+	{
+		.vendor		= "Macronix",
+		.name		= "MX23L12854",
+		.bustype	= BUS_SPI,
+		.manufacture_id	= MACRONIX_ID,
+		.model_id	= MACRONIX_MX23L12854,
+		.total_size	= 16384,
+		.page_size	= 256,
+		.tested		= {.probe = NT, .read = NT, .erase = NA, .write = NA},
+		.probe		= probe_spi_rdid,
+		.probe_timing	= TIMING_ZERO,
+		.write		= NULL, /* MX23L12854 is a mask ROM, so it is read-only */
+		.read		= spi_chip_read, /* Fast read (0x0B) supported */
+		.voltage	= {3000, 3600},
+	},
+
+	{
+		.vendor		= "Macronix",
 		.name		= "MX25L512(E)/MX25V512(C)",
 		.bustype	= BUS_SPI,
 		.manufacture_id	= MACRONIX_ID,
diff --git a/flashchips.h b/flashchips.h
index f0fbf4b..a850e4c 100644
--- a/flashchips.h
+++ b/flashchips.h
@@ -448,7 +448,10 @@
 
 #define MACRONIX_ID		0xC2	/* Macronix (MX) */
 /* Mask ROMs */
+#define MACRONIX_MX23L1654	0x0515
 #define MACRONIX_MX23L3254	0x0516
+#define MACRONIX_MX23L6454	0x0517
+#define MACRONIX_MX23L12854	0x0518
 /* MX25 chips are SPI, first byte of device ID is memory type,
  * second byte of device ID is log(bitsize)-9.
  * Generalplus SPI chips seem to be compatible with Macronix