Add support for Eon EN25F64

Its ID was spotted in an ICH descriptor region update by Jetway:
http://paste.flashrom.org/view.php?id=1217

 and is used on ASUS P8B75-V
boards according to some forum posts (2 chips per board actually).

No datasheet was found, so most values are just guessed from the EN25F32.

Corresponding to flashrom svn r1594.
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>

flashchips.c

@@ -3405,6 +3405,40 @@ const struct flashchip flashchips[] = {
 		.voltage	= {2700, 3600},
 	},
 
+	{
+		.vendor		= "Eon",
+		.name		= "EN25F64",
+		.bustype	= BUS_SPI,
+		.manufacture_id	= EON_ID_NOPREFIX,
+		.model_id	= EON_EN25F32,
+		.total_size	= 8192,
+		.page_size	= 256,
+		.feature_bits	= FEATURE_WRSR_WREN,
+		.tested		= TEST_UNTESTED,
+		.probe		= probe_spi_rdid,
+		.probe_timing	= TIMING_ZERO,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 2048} },
+				.block_erase = spi_block_erase_20,
+			}, {
+				.eraseblocks = { {64 * 1024, 128} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {8 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_60,
+			}, {
+				.eraseblocks = { {8 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
+		.unlock		= spi_disable_blockprotect,
+		.write		= spi_chip_write_256,
+		.read		= spi_chip_read,
+		.voltage	= {2700, 3600},
+	},
+
 	{
 		.vendor		= "Eon",
 		.name		= "EN25Q40",

flashchips.h

@@ -248,6 +248,7 @@
 #define EON_EN25F80		0x3114
 #define EON_EN25F16		0x3115
 #define EON_EN25F32		0x3116
+#define EON_EN25F64		0x3117	/* guessed */
 #define EON_EN25Q40		0x3013
 #define EON_EN25Q80		0x3014
 #define EON_EN25Q16		0x3015	/* Same as EN25D16 */