Add support for SST's 25WF series of SPI flash chips

This includes SST25WF512, SST25WF010, SST25WF020 and SST25WF040.
They require a VCC of 1.65 - 1.95V, which is why i could not test them.
The SOIC version of the SST25WF512 is used on an AMD X300-based
graphics card i own.

Corresponding to flashrom svn r1611.
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>

flashchips.c

@@ -6633,6 +6633,148 @@ const struct flashchip flashchips[] = {
 		.voltage	= {2700, 3600},
 	},
 
+	{
+		.vendor		= "SST",
+		.name		= "SST25WF512",
+		.bustype	= BUS_SPI,
+		.manufacture_id	= SST_ID,
+		.model_id	= SST_SST25WF512,
+		.total_size	= 64,
+		.page_size	= 256,
+		.feature_bits	= FEATURE_WRSR_EITHER,
+		.tested		= TEST_UNTESTED,
+		.probe		= probe_spi_rdid,
+		.probe_timing	= TIMING_ZERO,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 16} },
+				.block_erase = spi_block_erase_20,
+			}, {
+				.eraseblocks = { {32 * 1024, 2} },
+				.block_erase = spi_block_erase_52,
+			}, {
+				.eraseblocks = { {1024 * 64, 1} },
+				.block_erase = spi_block_erase_60,
+			}, {
+				.eraseblocks = { {1024 * 64, 1} },
+				.block_erase = spi_block_erase_c7,
+			},
+		},
+		.unlock		= spi_disable_blockprotect,
+		.write		= spi_aai_write,
+		.read		= spi_chip_read, /* Fast read (0x0B) supported */
+		.voltage	= {1650, 1950},
+	},
+
+	{
+		.vendor		= "SST",
+		.name		= "SST25WF010",
+		.bustype	= BUS_SPI,
+		.manufacture_id	= SST_ID,
+		.model_id	= SST_SST25WF010,
+		.total_size	= 128,
+		.page_size	= 256,
+		.feature_bits	= FEATURE_WRSR_EITHER,
+		.tested		= TEST_UNTESTED,
+		.probe		= probe_spi_rdid,
+		.probe_timing	= TIMING_ZERO,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 32} },
+				.block_erase = spi_block_erase_20,
+			}, {
+				.eraseblocks = { {32 * 1024, 4} },
+				.block_erase = spi_block_erase_52,
+			}, {
+				.eraseblocks = { {1024 * 128, 1} },
+				.block_erase = spi_block_erase_60,
+			}, {
+				.eraseblocks = { {1024 * 128, 1} },
+				.block_erase = spi_block_erase_c7,
+			},
+		},
+		.unlock		= spi_disable_blockprotect,
+		.write		= spi_aai_write,
+		.read		= spi_chip_read, /* Fast read (0x0B) supported */
+		.voltage	= {1650, 1950},
+	},
+
+	{
+		.vendor		= "SST",
+		.name		= "SST25WF020",
+		.bustype	= BUS_SPI,
+		.manufacture_id	= SST_ID,
+		.model_id	= SST_SST25WF020,
+		.total_size	= 256,
+		.page_size	= 256,
+		.feature_bits	= FEATURE_WRSR_EITHER,
+		.tested		= TEST_UNTESTED,
+		.probe		= probe_spi_rdid,
+		.probe_timing	= TIMING_ZERO,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 64} },
+				.block_erase = spi_block_erase_20,
+			}, {
+				.eraseblocks = { {32 * 1024, 8} },
+				.block_erase = spi_block_erase_52,
+			}, {
+				.eraseblocks = { {64 * 1024, 4} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {1024 * 256, 1} },
+				.block_erase = spi_block_erase_60,
+			}, {
+				.eraseblocks = { {1024 * 256, 1} },
+				.block_erase = spi_block_erase_c7,
+			},
+		},
+		.unlock		= spi_disable_blockprotect,
+		.write		= spi_aai_write,
+		.read		= spi_chip_read, /* Fast read (0x0B) supported */
+		.voltage	= {1650, 1950},
+	},
+
+	{
+		.vendor		= "SST",
+		.name		= "SST25WF040",
+		.bustype	= BUS_SPI,
+		.manufacture_id	= SST_ID,
+		.model_id	= SST_SST25WF040,
+		.total_size	= 512,
+		.page_size	= 256,
+		.feature_bits	= FEATURE_WRSR_EITHER,
+		.tested		= TEST_UNTESTED,
+		.probe		= probe_spi_rdid,
+		.probe_timing	= TIMING_ZERO,
+		.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 = { {1024 * 512, 1} },
+				.block_erase = spi_block_erase_60,
+			}, {
+				.eraseblocks = { {1024 * 512, 1} },
+				.block_erase = spi_block_erase_c7,
+			},
+		},
+		.unlock		= spi_disable_blockprotect,
+		.write		= spi_aai_write,
+		.read		= spi_chip_read, /* Fast read (0x0B) supported */
+		.voltage	= {1650, 1950},
+	},
+
 	{
 		.vendor		= "SST",
 		.name		= "SST28SF040A",