The Mikroe STM32 F4 board now uses /dev/config for configuration data storage. From Ken Pettit

configs/mikroe-stm32f4/Kconfig

@@ -8,55 +8,71 @@ if ARCH_BOARD_MIKROE_STM32F4
 config MIKROE_FLASH
 	bool "MTD driver for onboard 1M FLASH"
 	default n
-    select MTD
+	select MTD
-    select MTD_M25P
+	select MTD_M25P
-    select MTD_SMART
+	select MTD_SMART
-    select FS_SMARTFS
+	select FS_SMARTFS
-    select STM32_SPI3
+	select STM32_SPI3
-    select MTD_BYTE_WRITE
+	select MTD_BYTE_WRITE
 	---help---
 		Configures an MTD device for use with the onboard flash
 
 config MIKROE_FLASH_MINOR
 	int "Minor number for the FLASH /dev/smart entry"
 	default 0
-    depends on MIKROE_FLASH
+	depends on MIKROE_FLASH
 	---help---
 		Sets the minor number for the FLASH MTD /dev entry
 
 config MIKROE_FLASH_PART
 	bool "Enable partition support on FLASH"
 	default n
-    depends on MIKROE_FLASH
+	depends on MIKROE_FLASH
 	---help---
 		Enables creation of partitions on the FLASH
 
+config MIKROE_FLASH_CONFIG_PART
+	bool "Create application config data partition on FLASH"
+	default y
+	depends on MIKROE_FLASH_PART
+	depends on PLATFORM_CONFIGDATA
+	---help---
+		Enables creation of a /dev/config partition on the FLASH
+
+config MIKROE_FLASH_CONFIG_PART_NUMBER
+	int "Index number of config partition (in list below)"
+	default 0
+	depends on MIKROE_FLASH_CONFIG_PART
+	---help---
+		Specifies the index number of the config data partition
+		from the partition list.
+
 config MIKROE_FLASH_PART_LIST
 	string "Flash partition size list"
-    default "256,768"
+	default "8,248,768"
-    depends on MIKROE_FLASH_PART
+	depends on MIKROE_FLASH_PART
 	---help---
-		Comma separated list of partition sizes in KB
+		Comma separated list of partition sizes in KB.
 
 config MIKROE_RAMMTD
 	bool "MTD driver for SMARTFS RAM disk"
 	default n
-    select MTD
+	select MTD
-    select RAMMTD
+	select RAMMTD
 	---help---
 		Configures an MTD based RAM device for use with SMARTFS.
 
 config MIKROE_RAMMTD_MINOR
 	int "Minor number for RAM /dev/smart entry"
 	default 1
-    depends on MIKROE_RAMMTD
+	depends on MIKROE_RAMMTD
 	---help---
 		Sets the minor number for the RAM MTD /dev entry
 
 config MIKROE_RAMMTD_SIZE
 	int "Size in KB of the RAM device to create"
 	default 32
-    depends on MIKROE_RAMMTD
+	depends on MIKROE_RAMMTD
 	---help---
 		Sets the size of static RAM allocation for the SMART RAM device
 

configs/mikroe-stm32f4/src/up_nsh.c

@@ -59,6 +59,12 @@
 #  include <apps/usbmonitor.h>
 #endif
 
+#ifdef CONFIG_MIKROE_FLASH_CONFIG_PART
+#ifdef CONFIG_PLATFORM_CONFIGDATA
+#  include <nuttx/configdata.h>
+#endif
+#endif
+
 #ifdef CONFIG_STM32_OTGFS
 #  include "stm32_usbhost.h"
 #endif
@@ -227,6 +233,7 @@ int nsh_archinitialize(void)
         partno = 0;
         ptr = partstring;
         partoffset = 0;
+
         while (*ptr != '\0')
           {
             /* Get the partition size */
@@ -235,12 +242,27 @@ int nsh_archinitialize(void)
             mtd_part = mtd_partition(mtd, partoffset, (partsize>>2)*16);
             partoffset += (partsize >> 2) * 16;
 
-            /* Now initialize a SMART Flash block device and bind it to the MTD device */
+#ifdef CONFIG_MIKROE_FLASH_CONFIG_PART
+            /* Test if this is the config partition */
+
+            if (CONFIG_MIKROE_FLASH_CONFIG_PART_NUMBER == partno)
+              {
+                /* Register the partition as the config device */
+
+                mtdconfig_register(mtd_part);
+              }
+            else
+#endif
+              {
+                /* Now initialize a SMART Flash block device and bind it
+                 * to the MTD device.
+                 */
 
 #if defined(CONFIG_MTD_SMART) && defined(CONFIG_FS_SMARTFS)
-            sprintf(partname, "p%d", partno);
+                sprintf(partname, "p%d", partno);
-            smart_initialize(CONFIG_MIKROE_FLASH_MINOR, mtd_part, partname);
+                smart_initialize(CONFIG_MIKROE_FLASH_MINOR, mtd_part, partname);
 #endif
+              }
 
             /* Update the pointer to point to the next size in the list */
 
@@ -258,7 +280,6 @@ int nsh_archinitialize(void)
 
             partno++;
           }
-      }
 #else /* CONFIG_MIKROE_FLASH_PART */
 
         /* Configure the device with no partition support */
@@ -266,20 +287,21 @@ int nsh_archinitialize(void)
         smart_initialize(CONFIG_MIKROE_FLASH_MINOR, mtd, NULL);
 
 #endif /* CONFIG_MIKROE_FLASH_PART */
+      }
     }
 
   /* Create a RAM MTD device if configured */
 
 #if defined(CONFIG_RAMMTD) && defined(CONFIG_MIKROE_RAMMTD)
   {
-      uint8_t *start = (uint8_t *) kmalloc(CONFIG_MIKROE_RAMMTD_SIZE * 1024);
+    uint8_t *start = (uint8_t *) kmalloc(CONFIG_MIKROE_RAMMTD_SIZE * 1024);
-      mtd = rammtd_initialize(start, CONFIG_MIKROE_RAMMTD_SIZE * 1024);
+    mtd = rammtd_initialize(start, CONFIG_MIKROE_RAMMTD_SIZE * 1024);
-      mtd->ioctl(mtd, MTDIOC_BULKERASE, 0);
+    mtd->ioctl(mtd, MTDIOC_BULKERASE, 0);
 
-      /* Now initialize a SMART Flash block device and bind it to the MTD device */
+    /* Now initialize a SMART Flash block device and bind it to the MTD device */
 
 #if defined(CONFIG_MTD_SMART) && defined(CONFIG_FS_SMARTFS)
-      smart_initialize(CONFIG_MIKROE_RAMMTD_MINOR, mtd, NULL);
+    smart_initialize(CONFIG_MIKROE_RAMMTD_MINOR, mtd, NULL);
 #endif
   }
 
@@ -308,7 +330,6 @@ int nsh_archinitialize(void)
   else
     {
       message("nsh_archinitialize: Successfully bound SPI to the MMC/SD driver\n");
-
     }
 #endif