diff --git a/chipdrivers.h b/chipdrivers.h
index 496aa7e..6e2edc6 100644
--- a/chipdrivers.h
+++ b/chipdrivers.h
@@ -167,6 +167,9 @@
 /* stm50flw0x0x.c */
 int probe_stm50flw0x0x(struct flashchip *flash);
 int erase_stm50flw0x0x(struct flashchip *flash);
+int erase_block_stm50flw0x0x(struct flashchip *flash, unsigned int block, unsigned int blocksize);
+int erase_sector_stm50flw0x0x(struct flashchip *flash, unsigned int block, unsigned int blocksize);
+int erase_chip_stm50flw0x0x(struct flashchip *flash, unsigned int addr, unsigned int blocklen);
 int write_stm50flw0x0x(struct flashchip *flash, uint8_t *buf);
 
 #endif /* !__CHIPDRIVERS_H__ */
diff --git a/flashchips.c b/flashchips.c
index 0803dd0..68f2b9b 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -4191,7 +4191,17 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
-		.erase		= spi_chip_erase_c7,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {32 * 1024, 2} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {64 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
 		.write		= spi_chip_write_256,
 		.read		= spi_chip_read,
 	},
@@ -4212,7 +4222,17 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_spi_res,
 		.probe_timing	= TIMING_ZERO,
-		.erase		= spi_chip_erase_c7,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {32 * 1024, 2} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {64 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
 		.write		= spi_chip_write_1, /* 128 */
 		.read		= spi_chip_read,
 	},
@@ -4228,7 +4248,17 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
-		.erase		= spi_chip_erase_c7,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {32 * 1024, 4} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {128 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
 		.write		= spi_chip_write_256,
 		.read		= spi_chip_read,
 	},
@@ -4245,7 +4275,17 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_spi_res,
 		.probe_timing	= TIMING_ZERO,
-		.erase		= spi_chip_erase_c7,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {32 * 1024, 4} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {128 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
 		.write		= spi_chip_write_1, /* 128 */
 		.read		= spi_chip_read,
 	},
@@ -4261,7 +4301,17 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
-		.erase		= spi_chip_erase_c7,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {64 * 1024, 4} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {256 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
 		.write		= spi_chip_write_256,
 		.read		= spi_chip_read,
 	},
@@ -4274,10 +4324,20 @@
 		.model_id	= ST_M25P40,
 		.total_size	= 512,
 		.page_size	= 256,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
-		.erase		= spi_chip_erase_c7,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {64 * 1024, 8} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
 		.write		= spi_chip_write_256,
 		.read		= spi_chip_read,
 	},
@@ -4293,7 +4353,17 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_spi_res,
 		.probe_timing	= TIMING_ZERO,
-		.erase		= spi_chip_erase_c7,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {64 * 1024, 8} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
 		.write		= spi_chip_write_256,
 		.read		= spi_chip_read,
 	},
@@ -4306,10 +4376,20 @@
 		.model_id	= ST_M25P80,
 		.total_size	= 1024,
 		.page_size	= 256,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
-		.erase		= spi_chip_erase_c7,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {64 * 1024, 16} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {1024 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
 		.write		= spi_chip_write_256,
 		.read		= spi_chip_read,
 	},
@@ -4322,10 +4402,20 @@
 		.model_id	= ST_M25P16,
 		.total_size	= 2048,
 		.page_size	= 256,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
-		.erase		= spi_chip_erase_c7,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {64 * 1024, 32} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {2 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
 		.write		= spi_chip_write_256,
 		.read		= spi_chip_read,
 	},
@@ -4338,10 +4428,20 @@
 		.model_id	= ST_M25P32,
 		.total_size	= 4096,
 		.page_size	= 256,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
-		.erase		= spi_chip_erase_c7,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {64 * 1024, 64} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {4 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
 		.write		= spi_chip_write_256,
 		.read		= spi_chip_read,
 	},
@@ -4357,7 +4457,17 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
-		.erase		= spi_chip_erase_c7,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {64 * 1024, 128} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {8 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
 		.write		= spi_chip_write_256,
 		.read		= spi_chip_read,
 	},
@@ -4373,7 +4483,17 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
-		.erase		= spi_chip_erase_c7,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {256 * 1024, 64} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {16 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
 		.write		= spi_chip_write_256,
 		.read		= spi_chip_read,
 	},
@@ -4389,7 +4509,22 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_ZERO,	/* Datasheet has no timing info specified */
-		.erase		= erase_m29f002,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = {
+					{16 * 1024, 1},
+					{8 * 1024, 2},
+					{32 * 1024, 1},
+					{64 * 1024, 3},
+				},
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {256 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			}
+		},
 		.write		= write_m29f002b,
 		.read		= read_memmapped,
 	},
@@ -4402,10 +4537,25 @@
 		.model_id	= ST_M29F002T,
 		.total_size	= 256,
 		.page_size	= 64 * 1024,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_ZERO,	/* Datasheet has no timing info specified */
-		.erase		= erase_m29f002,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = {
+					{64 * 1024, 3},
+					{32 * 1024, 1},
+					{8 * 1024, 2},
+					{16 * 1024, 1},
+				},
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {256 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			}
+		},
 		.write		= write_m29f002t,
 		.read		= read_memmapped,
 	},
@@ -4418,10 +4568,20 @@
 		.model_id	= ST_M29F040B,
 		.total_size	= 512,
 		.page_size	= 64 * 1024,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_29f040b,
 		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (am29f040b.c) */
-		.erase		= erase_29f040b,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {64 * 1024, 8}, },
+				.block_erase = erase_sector_29f040b,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = erase_chip_29f040b,
+			}
+		},
 		.write		= write_29f040b,
 		.read		= read_memmapped,
 	},
@@ -4437,7 +4597,22 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_m29f400bt,
 		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (m29f400bt.c) */
-		.erase		= erase_m29f400bt,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = {
+					{64 * 1024, 7},
+					{32 * 1024, 1},
+					{8 * 1024, 2},
+					{16 * 1024, 1},
+				},
+				.block_erase = block_erase_m29f400bt,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = block_erase_chip_m29f400bt,
+			}
+		},
 		.write		= write_coreboot_m29f400bt,
 		.read		= read_memmapped,
 	},
@@ -4453,7 +4628,17 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_ZERO,	/* Datasheet has no timing info specified */
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {16 * 1024, 8}, },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {128 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			}
+		},
 		.write		= write_jedec,
 		.read		= read_memmapped,
 	},
@@ -4469,7 +4654,17 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_ZERO,	/* Datasheet has no timing info specified */
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {64 * 1024, 8}, },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			}
+		},
 		.write		= write_jedec,
 		.read		= read_memmapped,
 	},
@@ -4486,7 +4681,17 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_FIXME,
-		.erase		= erase_stm50flw0x0x,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {64 * 1024, 8}, },
+				.block_erase = erase_block_stm50flw0x0x,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = erase_chip_stm50flw0x0x,
+			}
+		},
 		.write		= write_stm50flw0x0x,
 		.read		= read_memmapped,
 	},
@@ -4503,7 +4708,17 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_FIXME,
-		.erase		= erase_stm50flw0x0x,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {64 * 1024, 8}, },
+				.block_erase = erase_block_stm50flw0x0x,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = erase_chip_stm50flw0x0x,
+			}
+		},
 		.write		= write_stm50flw0x0x,
 		.read		= read_memmapped,
 	},
@@ -4517,10 +4732,20 @@
 		.total_size	= 1024,
 		.page_size	= 64 * 1024,
 		.feature_bits	= FEATURE_REGISTERMAP,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_FIXME,
-		.erase		= erase_stm50flw0x0x,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {64 * 1024, 16}, },
+				.block_erase = erase_block_stm50flw0x0x,
+			}, {
+				.eraseblocks = { {1024 * 1024, 1} },
+				.block_erase = erase_chip_stm50flw0x0x,
+			}
+		},
 		.write		= write_stm50flw0x0x,
 		.read		= read_memmapped,
 	},
@@ -4537,7 +4762,17 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_FIXME,
-		.erase		= erase_stm50flw0x0x,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {64 * 1024, 16}, },
+				.block_erase = erase_block_stm50flw0x0x,
+			}, {
+				.eraseblocks = { {1024 * 1024, 1} },
+				.block_erase = erase_chip_stm50flw0x0x,
+			}
+		},
 		.write		= write_stm50flw0x0x,
 		.read		= read_memmapped,
 	},
@@ -4554,6 +4789,21 @@
 		.probe		= probe_49lfxxxc,
 		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (sst49lfxxxc.c) */
 		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = {
+					{64 * 1024, 3},
+					{32 * 1024, 1},
+					{8 * 1024, 2},
+					{16 * 1024, 1},
+				},
+				.block_erase = erase_block_stm50flw0x0x,
+			}, {
+				.eraseblocks = { {256 * 1024, 1} },
+				.block_erase = erase_chip_stm50flw0x0x,
+			}
+		},
 		.write		= NULL,
 		.read		= read_memmapped,
 	},
@@ -4569,8 +4819,18 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_82802ab,
 		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (82802ab.c) */
-		.erase		= erase_82802ab,
-		.write		= write_82802ab,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {64 * 1024, 32}, },
+				.block_erase = erase_block_stm50flw0x0x,
+			}, {
+				.eraseblocks = { {2 * 1024 * 1024, 1} },
+				.block_erase = erase_chip_stm50flw0x0x,
+			}
+		},
+		.write		= write_stm50flw0x0x,
 		.read		= read_memmapped,
 	},
 
@@ -4582,11 +4842,21 @@
 		.model_id	= ST_M50FW040,
 		.total_size	= 512,
 		.page_size	= 64 * 1024,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_82802ab,
 		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (82802ab.c) */
-		.erase		= erase_82802ab,
-		.write		= write_82802ab,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {64 * 1024, 8}, },
+				.block_erase = erase_block_stm50flw0x0x,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = erase_chip_stm50flw0x0x,
+			}
+		},
+		.write		= write_stm50flw0x0x,
 		.read		= read_memmapped,
 	},
 
@@ -4598,11 +4868,21 @@
 		.model_id	= ST_M50FW080,
 		.total_size	= 1024,
 		.page_size	= 64 * 1024,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_82802ab,
 		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (82802ab.c) */
-		.erase		= erase_82802ab,
-		.write		= write_82802ab,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {64 * 1024, 16}, },
+				.block_erase = erase_block_stm50flw0x0x,
+			}, {
+				.eraseblocks = { {1024 * 1024, 1} },
+				.block_erase = erase_chip_stm50flw0x0x,
+			}
+		},
+		.write		= write_stm50flw0x0x,
 		.read		= read_memmapped,
 	},
 
@@ -4617,7 +4897,23 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_ZERO,	/* Datasheet has no timing info specified */
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = {
+					{4 * 1024, 16},
+					{64 * 1024, 30},
+					{32 * 1024, 1},
+					{8 * 1024, 2},
+					{16 * 1024, 1},
+				},
+				.block_erase = erase_block_stm50flw0x0x,
+			}, {
+				.eraseblocks = { {2 * 1024 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			}
+		},
 		.write		= write_jedec,
 		.read		= read_memmapped,
 	},
@@ -4633,7 +4929,17 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_ZERO,	/* Datasheet has no timing info specified */
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {1 * 1024, 512} },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			},
+		},
 		.write		= write_49f002,
 		.read		= read_memmapped,
 	},
@@ -4649,7 +4955,17 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_ZERO,	/* Datasheet has no timing info specified */
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {512, 256} },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {128 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			},
+		},
 		.write		= write_49f002,
 		.read		= read_memmapped,
 	},
@@ -4662,10 +4978,20 @@
 		.model_id	= S29C51002T,
 		.total_size	= 256,
 		.page_size	= 128,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_ZERO,	/* Datasheet has no timing info specified */
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {512, 512} },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {256 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			},
+		},
 		.write		= write_49f002,
 		.read		= read_memmapped,
 	},
@@ -4681,7 +5007,17 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_ZERO,
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {1 * 1024, 496} },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			},
+		},
 		.write		= write_49f002,
 		.read		= read_memmapped,
 	},
@@ -4698,6 +5034,21 @@
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_ZERO,	/* Datasheet has no timing info specified */
 		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = {
+					{16 * 1024, 1},
+					{8 * 1024, 2},
+					{32 * 1024, 1},
+					{64 * 1024, 3},
+				},
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {256 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			},
+		},
 		.write		= NULL,
 		.read		= read_memmapped,
 	},
@@ -4714,6 +5065,21 @@
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_ZERO,	/* Datasheet has no timing info specified */
 		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = {
+					{64 * 1024, 3},
+					{32 * 1024, 1},
+					{8 * 1024, 2},
+					{16 * 1024, 1},
+				},
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {256 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			},
+		},
 		.write		= NULL,
 		.read		= read_memmapped,
 	},
diff --git a/stm50flw0x0x.c b/stm50flw0x0x.c
index e90bbd2..3b56436 100644
--- a/stm50flw0x0x.c
+++ b/stm50flw0x0x.c
@@ -2,6 +2,7 @@
  * This file is part of the flashrom project.
  *
  * Copyright (C) 2008 Claus Gindhart <claus.gindhart@kontron.com>
+ * Copyright (C) 2009 Sean Nelson <audiohacked@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -99,9 +100,9 @@
 	return 0;
 }
 
-int erase_block_stm50flw0x0x(struct flashchip *flash, int offset)
+int erase_block_stm50flw0x0x(struct flashchip *flash, unsigned int block, unsigned int blocksize)
 {
-	chipaddr bios = flash->virtual_memory + offset;
+	chipaddr bios = flash->virtual_memory + block;
 
 	// clear status register
 	chip_writeb(0x50, bios);
@@ -113,11 +114,34 @@
 
 	wait_stm50flw0x0x(flash->virtual_memory);
 
-	if (check_erased_range(flash, offset, flash->page_size)) {
+	if (check_erased_range(flash, block, blocksize)) {
 		fprintf(stderr, "ERASE FAILED!\n");
 		return -1;
 	}
-	printf("DONE BLOCK 0x%x\n", offset);
+	printf("DONE BLOCK 0x%x\n", block);
+
+	return 0;
+}
+
+int erase_sector_stm50flw0x0x(struct flashchip *flash, unsigned int sector, unsigned int sectorsize)
+{
+	chipaddr bios = flash->virtual_memory + sector;
+
+	// clear status register
+	chip_writeb(0x50, bios);
+	printf_debug("Erase at 0x%lx\n", bios);
+	// now start it
+	chip_writeb(0x32, bios);
+	chip_writeb(0xd0, bios);
+	programmer_delay(10);
+
+	wait_stm50flw0x0x(flash->virtual_memory);
+
+	if (check_erased_range(flash, sector, sectorsize)) {
+		fprintf(stderr, "ERASE FAILED!\n");
+		return -1;
+	}
+	printf("DONE BLOCK 0x%x\n", sector);
 
 	return 0;
 }
@@ -178,7 +202,7 @@
 			fprintf(stderr, "UNLOCK FAILED!\n");
 			return -1;
 		}
-		if (erase_block_stm50flw0x0x(flash, i * page_size)) {
+		if (erase_block_stm50flw0x0x(flash, i * page_size, page_size)) {
 			fprintf(stderr, "ERASE FAILED!\n");
 			return -1;
 		}
@@ -188,6 +212,16 @@
 	return 0;
 }
 
+int erase_chip_stm50flw0x0x(struct flashchip *flash, unsigned int addr, unsigned int blocklen)
+{
+	if ((addr != 0) || (blocklen != flash->total_size * 1024)) {
+		msg_cerr("%s called with incorrect arguments\n",
+			__func__);
+		return -1;
+	}
+	return erase_stm50flw0x0x(flash);
+}
+
 int write_stm50flw0x0x(struct flashchip *flash, uint8_t * buf)
 {
 	int i, rc = 0;
@@ -221,7 +255,7 @@
 
 		rc = unlock_block_stm50flw0x0x(flash, i * page_size);
 		if (!rc)
-			rc = erase_block_stm50flw0x0x(flash, i * page_size);
+			rc = erase_block_stm50flw0x0x(flash, i * page_size, page_size);
 		if (!rc)
 			write_page_stm50flw0x0x(bios, buf + i * page_size,
 					bios + i * page_size, page_size);