Add MTD SST25 driver for larger SST25 parts. From Ken Pettit

ChangeLog

@@ -6109,4 +6109,7 @@
 	* include/mtd/mtd.h:  Packed the geometry structure so that it can
 	  support larger erase block sizes without increasing the size of
 	  the geometry structure (2013-11-27).
-
+	* drivers/mtd/sst25xx.c:  Add another SST25 SerialFlash driver.  This
+	  one differs from sst25.c because it supports larger SST25 parts:  In
+	  the larger parts support page write instead of byte/word writes like
+	  the smaller parts.  From Ken Pettit (2013-11-28).

drivers/mtd/Kconfig

@@ -351,6 +351,42 @@ config SST25_SLOWREAD
 
 endif
 
+config MTD_SST25XX
+	bool "SPI-based SST25XX FLASH (64-MBit and larger)"
+	default n
+	select SPI
+	---help---
+		With the 64 MBit and larger parts, SST changed the write mechanism to
+		support page write instead of byte/word write like the smaller parts.
+		As a result, the SST25 driver is not compatible with the larger density
+		parts, and the SST25XX driver must be used instead.
+
+if MTD_SST25XX
+
+config SST25XX_SPIMODE
+	int "SST25 SPI Mode"
+	default 0
+
+config SST25XX_SPIFREQUENCY
+	int "SST25 SPI Frequency"
+	default 20000000
+
+config SST25XX_MANUFACTURER
+	hex "Manufacturers ID"
+	default 0xBF
+	---help---
+		Various manufacturers may have produced the parts.  0xBF is the manufacturer ID
+		for the parts manufactured by SST.
+
+config SST25XX_MEMORY_TYPE
+	hex "Memory type ID"
+	default 0x25
+	---help---
+		The memory type for SST25VF065 series is 0x25, but this can be modified if needed
+		to support compatible devices from different manufacturers.
+
+endif
+
 config MTD_SST39FV
 	bool "SST39FV NOR FLASH"
 	default n

drivers/mtd/Make.defs

@@ -64,6 +64,10 @@ ifeq ($(CONFIG_MTD_SST25),y)
 CSRCS += sst25.c
 endif
 
+ifeq ($(CONFIG_MTD_SST25XX),y)
+CSRCS += sst25xx.c
+endif
+
 ifeq ($(CONFIG_MTD_SST39FV),y)
 CSRCS += sst39vf.c
 endif

include/nuttx/mtd/mtd.h

@@ -297,7 +297,7 @@ FAR struct mtd_dev_s *rammtd_initialize(FAR uint8_t *start, size_t size);
  * Name: sst25_initialize
  *
  * Description:
- *   Initializes the drvier for SPI-based SST25 FLASH
+ *   Initializes the driver for SPI-based SST25 FLASH
  *
  *   Supports SST25VF512, SST25VF010, SST25VF520, SST25VF540, SST25VF080,
  *   and SST25VF016
@@ -306,6 +306,18 @@ FAR struct mtd_dev_s *rammtd_initialize(FAR uint8_t *start, size_t size);
 
 FAR struct mtd_dev_s *sst25_initialize(FAR struct spi_dev_s *dev);
 
+/****************************************************************************
+ * Name: sst25xx_initialize
+ *
+ * Description:
+ *   Initializes the driver for SPI-based SST25XX FLASH
+ *
+ *   Supports SST25VF064
+ *
+ ****************************************************************************/
+
+FAR struct mtd_dev_s *sst25xx_initialize(FAR struct spi_dev_s *dev);
+
 /****************************************************************************
  * Name: sst39vf_initialize
  *