diff --git a/flashchips.c b/flashchips.c
index bbd5cad..d2a8d77 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -7376,6 +7376,56 @@
 
 	{
 		.vendor		= "ISSI",
+		.name		= "IS25LP256",
+		.bustype	= BUS_SPI,
+		.manufacture_id	= ISSI_ID_SPI,
+		.model_id	= ISSI_IS25LP256,
+		.total_size	= 32768,
+		.page_size	= 256,
+		/* supports SFDP */
+		/* OTP: 1024B total; read 0x68; write 0x62, erase 0x64, read ID 0x4B */
+		/* FOUR_BYTE_ADDR: supports 4-bytes addressing mode */
+		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_OTP | FEATURE_4BA | FEATURE_4BA_ENTER_EAR7,
+		.tested		= TEST_OK_PREW,
+		.probe		= probe_spi_rdid,
+		.probe_timing	= TIMING_ZERO,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 8192} },
+				.block_erase = spi_block_erase_21,
+			}, {
+				.eraseblocks = { {4 * 1024, 8192} },
+				.block_erase = spi_block_erase_20,
+				/* could also use spi_block_erase_d7 */
+			}, {
+				.eraseblocks = { {32 * 1024, 1024} },
+				.block_erase = spi_block_erase_5c,
+			}, {
+				.eraseblocks = { {32 * 1024, 1024} },
+				.block_erase = spi_block_erase_52,
+			}, {
+				.eraseblocks = { {64 * 1024, 512} },
+				.block_erase = spi_block_erase_dc,
+			}, {
+				.eraseblocks = { {64 * 1024, 512} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {32 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_60,
+			}, {
+				.eraseblocks = { {32 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
+		.unlock		= spi_disable_blockprotect,
+		.write		= spi_chip_write_256,
+		.read		= spi_chip_read,
+		.voltage	= {2300, 3600},
+	},
+
+	{
+		.vendor		= "ISSI",
 		.name		= "IS25WP032",
 		.bustype	= BUS_SPI,
 		.manufacture_id = ISSI_ID_SPI,
@@ -7502,6 +7552,56 @@
 
 	{
 		.vendor		= "ISSI",
+		.name		= "IS25WP256",
+		.bustype	= BUS_SPI,
+		.manufacture_id	= ISSI_ID_SPI,
+		.model_id	= ISSI_IS25WP256,
+		.total_size	= 32768,
+		.page_size	= 256,
+		/* supports SFDP */
+		/* OTP: 1024B total; read 0x68; write 0x62, erase 0x64, read ID 0x4B */
+		/* FOUR_BYTE_ADDR: supports 4-bytes addressing mode */
+		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_OTP | FEATURE_4BA | FEATURE_4BA_ENTER_EAR7,
+		.tested		= TEST_OK_PREW,
+		.probe		= probe_spi_rdid,
+		.probe_timing	= TIMING_ZERO,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 8192} },
+				.block_erase = spi_block_erase_21,
+			}, {
+				.eraseblocks = { {4 * 1024, 8192} },
+				.block_erase = spi_block_erase_20,
+				/* could also use spi_block_erase_d7 */
+			}, {
+				.eraseblocks = { {32 * 1024, 1024} },
+				.block_erase = spi_block_erase_5c,
+			}, {
+				.eraseblocks = { {32 * 1024, 1024} },
+				.block_erase = spi_block_erase_52,
+			}, {
+				.eraseblocks = { {64 * 1024, 512} },
+				.block_erase = spi_block_erase_dc,
+			}, {
+				.eraseblocks = { {64 * 1024, 512} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {32 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_60,
+			}, {
+				.eraseblocks = { {32 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
+		.unlock		= spi_disable_blockprotect,
+		.write		= spi_chip_write_256,
+		.read		= spi_chip_read,
+		.voltage	= {1650, 1950},
+	},
+
+	{
+		.vendor		= "ISSI",
 		.name		= "IS29GL064B",
 		.bustype	= BUS_PARALLEL,
 		.manufacture_id	= ISSI_ID,
diff --git a/flashchips.h b/flashchips.h
index 429acef..434c355 100644
--- a/flashchips.h
+++ b/flashchips.h
@@ -456,9 +456,11 @@
 #define ISSI_ID_SPI		0x9D	/* ISSI ID used for SPI flash, see also PMC_ID_NOPREFIX */
 #define ISSI_IS25LP064		0x6017
 #define ISSI_IS25LP128		0x6018
+#define ISSI_IS25LP256		0x6019
 #define ISSI_IS25WP032		0x7016
 #define ISSI_IS25WP064		0x7017
 #define ISSI_IS25WP128		0x7018
+#define ISSI_IS25WP256		0x7019
 #define ISSI_PMC_IS29GL032B	0xF9
 #define ISSI_PMC_IS29GL032T	0xF6
 #define ISSI_PMC_IS29GL064B	0x7E1000