diff --git a/flashchips.c b/flashchips.c
index 786d53a..6a7be78 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -2032,10 +2032,29 @@ struct flashchip flashchips[] = {
 		.model_id	= SST_25VF016B,
 		.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 = { {4 * 1024, 512} },
+				.block_erase = spi_block_erase_20,
+			}, {
+				.eraseblocks = { {32 * 1024, 64} },
+				.block_erase = spi_block_erase_52,
+			}, {
+				.eraseblocks = { {64 * 1024, 32} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {2 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_60,
+			}, {
+				.eraseblocks = { {2 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			},
+		},
 		.write		= spi_chip_write_1,
 		.read		= spi_chip_read,
 	},
@@ -2048,42 +2067,93 @@ struct flashchip flashchips[] = {
 		.model_id	= SST_25VF032B,
 		.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 = { {4 * 1024, 1024} },
+				.block_erase = spi_block_erase_20,
+			}, {
+				.eraseblocks = { {32 * 1024, 128} },
+				.block_erase = spi_block_erase_52,
+			}, {
+				.eraseblocks = { {64 * 1024, 64} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {4 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_60,
+			}, {
+				.eraseblocks = { {4 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			},
+		},
 		.write		= spi_chip_write_1,
 		.read		= spi_chip_read,
 	},
 
 	{
 		.vendor		= "SST",
-		.name		= "SST25VF040B",
+		.name		= "SST25VF040.REMS",
 		.bustype	= CHIP_BUSTYPE_SPI,
 		.manufacture_id	= SST_ID,
-		.model_id	= SST_25VF040B,
+		.model_id	= SST_25VF040_REMS,
 		.total_size	= 512,
 		.page_size	= 256,
-		.tested		= TEST_UNTESTED,
-		.probe		= probe_spi_rdid,
+		.tested		= TEST_OK_PR,
+		.probe		= probe_spi_rems,
 		.probe_timing	= TIMING_ZERO,
-		.erase		= spi_chip_erase_c7,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 128} },
+				.block_erase = spi_block_erase_20,
+			}, {
+				.eraseblocks = { {32 * 1024, 16} },
+				.block_erase = spi_block_erase_52,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = spi_block_erase_60,
+			},
+		},
 		.write		= spi_chip_write_1,
 		.read		= spi_chip_read,
 	},
 
 	{
 		.vendor		= "SST",
-		.name		= "SST25VF040.REMS",
+		.name		= "SST25VF040B",
 		.bustype	= CHIP_BUSTYPE_SPI,
 		.manufacture_id	= SST_ID,
-		.model_id	= SST_25VF040_REMS,
+		.model_id	= SST_25VF040B,
 		.total_size	= 512,
-		.page_size	= 64 * 1024,
-		.tested		= TEST_OK_PR,
-		.probe		= probe_spi_rems,
+		.page_size	= 256,
+		.tested		= TEST_UNTESTED,
+		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
-		.erase		= spi_chip_erase_60,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 128} },
+				.block_erase = spi_block_erase_20,
+			}, {
+				.eraseblocks = { {32 * 1024, 16} },
+				.block_erase = spi_block_erase_52,
+			}, {
+				.eraseblocks = { {64 * 1024, 8} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = spi_block_erase_60,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			},
+		},
 		.write		= spi_chip_write_1,
 		.read		= spi_chip_read,
 	},
@@ -2095,11 +2165,30 @@ struct flashchip flashchips[] = {
 		.manufacture_id	= SST_ID,
 		.model_id	= SST_25VF040B_REMS,
 		.total_size	= 512,
-		.page_size	= 64 * 1024,
+		.page_size	= 256,
 		.tested		= TEST_OK_PR,
 		.probe		= probe_spi_rems,
 		.probe_timing	= TIMING_ZERO,
-		.erase		= spi_chip_erase_c7,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 128} },
+				.block_erase = spi_block_erase_20,
+			}, {
+				.eraseblocks = { {32 * 1024, 16} },
+				.block_erase = spi_block_erase_52,
+			}, {
+				.eraseblocks = { {64 * 1024, 8} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = spi_block_erase_60,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			},
+		},
 		.write		= spi_chip_write_1,
 		.read		= spi_chip_read,
 	},
@@ -2112,10 +2201,29 @@ struct flashchip flashchips[] = {
 		.model_id	= SST_25VF080B,
 		.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_60_c7,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 256} },
+				.block_erase = spi_block_erase_20,
+			}, {
+				.eraseblocks = { {32 * 1024, 32} },
+				.block_erase = spi_block_erase_52,
+			}, {
+				.eraseblocks = { {64 * 1024, 16} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {1024 * 1024, 1} },
+				.block_erase = spi_block_erase_60,
+			}, {
+				.eraseblocks = { {1024 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			},
+		},
 		.write		= spi_chip_write_1,
 		.read		= spi_chip_read,
 	},