diff --git a/flashchips.c b/flashchips.c
index 3994c93..e6215a0 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -6276,6 +6276,44 @@
 
 	{
 		.vendor		= "GigaDevice",
+		.name		= "GD25Q256D",
+		.bustype	= BUS_SPI,
+		.manufacture_id	= GIGADEVICE_ID,
+		.model_id	= GIGADEVICE_GD25Q256D,
+		.total_size	= 32768,
+		.page_size	= 256,
+		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_OTP | FEATURE_4BA_WREN,
+		.tested		= TEST_UNTESTED,
+		.probe		= probe_spi_rdid,
+		.probe_timing	= TIMING_ZERO,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 8192} },
+				.block_erase = spi_block_erase_20,
+			}, {
+				.eraseblocks = { {32 * 1024, 1024} },
+				.block_erase = spi_block_erase_52,
+			}, {
+				.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,
+			}
+		},
+		.printlock	= spi_prettyprint_status_register_bp3_srwd,
+		.unlock		= spi_disable_blockprotect,
+		.write		= spi_chip_write_256,
+		.read		= spi_chip_read,
+		.voltage	= {2700, 3600},
+	},
+
+	{
+		.vendor		= "GigaDevice",
 		.name		= "GD25Q32(B)",
 		.bustype	= BUS_SPI,
 		.manufacture_id	= GIGADEVICE_ID,
diff --git a/flashchips.h b/flashchips.h
index 7b8bf04..c4b863d 100644
--- a/flashchips.h
+++ b/flashchips.h
@@ -372,6 +372,7 @@
 #define GIGADEVICE_GD25Q32	0x4016	/* Same as GD25Q32B */
 #define GIGADEVICE_GD25Q64	0x4017	/* Same as GD25Q64B */
 #define GIGADEVICE_GD25Q128	0x4018	/* GD25Q128B and GD25Q128C only, can be distinguished by SFDP */
+#define GIGADEVICE_GD25Q256D	0x4019
 #define GIGADEVICE_GD25VQ21B	0x4212
 #define GIGADEVICE_GD25VQ41B	0x4213  /* Same as GD25VQ40C, can be distinguished by SFDP */
 #define GIGADEVICE_GD25VQ80C	0x4214