diff --git a/configs/README.txt b/configs/README.txt
index b51b87bece..b3d0e91f51 100644
--- a/configs/README.txt
+++ b/configs/README.txt
@@ -270,8 +270,6 @@ defconfig -- This is a configuration file similar to the Linux
     CONFIG_DEBUG_GRAPHICS - enable NX graphics debug output
       (disabled by default)
 
-    CONFIG_ARCH_LOWPUTC - architecture supports low-level, boot
-      time console output
     CONFIG_MM_REGIONS - If the architecture includes multiple
       regions of memory to allocate from, this specifies the
       number of memory regions that the memory manager must
@@ -285,6 +283,28 @@ defconfig -- This is a configuration file similar to the Linux
       of size less than or equal to 64Kb.  In this case, CONFIG_MM_SMALL
       can be defined so that those MCUs will also benefit from the
       smaller, 16-bit-based allocation overhead.
+    CONFIG_HEAP2_BASE and CONFIG_HEAP2_SIZE
+      Some architectures use these settings to specify the size of
+      a second heap region.
+    CONFIG_GRAN
+      Enable granual allocator support.  Allocations will be aligned to the
+      granule size; allocations will be in units of the granule size.
+      Larger granules will give better performance and less overhead but
+      more losses of memory due to alignment and quantization waste.
+      NOTE: The current implementation also restricts the maximum
+      allocation size to 32 granaules.  That restriction could be
+      eliminated with some additional coding effort.
+    CONFIG_GRAN_SINGLE
+      Select if there is only one instance of the granule allocator (i.e.,
+      gran_initialize will be called only once. In this case, (1) there
+      are a few optimizations that can can be done and (2) the GRAN_HANDLE
+      is not needed.
+    CONFIG_DEBUG_GRAM
+      Just like CONFIG_DEBUG_MM, but only generates ouput from the gran
+      allocation logic.
+
+    CONFIG_ARCH_LOWPUTC - architecture supports low-level, boot
+      time console output
     CONFIG_MSEC_PER_TICK - The default system timer is 100Hz
       or MSEC_PER_TICK=10.  This setting may be defined to
       inform NuttX that the processor hardware is providing
diff --git a/configs/fire-stm32v2/nsh/defconfig b/configs/fire-stm32v2/nsh/defconfig
index ef5fcbf400..fda34debe3 100644
--- a/configs/fire-stm32v2/nsh/defconfig
+++ b/configs/fire-stm32v2/nsh/defconfig
@@ -481,6 +481,7 @@ CONFIG_FAT_MAXFNAME=32
 #
 # CONFIG_MM_SMALL is not set
 CONFIG_MM_REGIONS=1
+# CONFIG_GRAN is not set
 
 #
 # Library Routines
diff --git a/configs/shenzhou/nsh/defconfig b/configs/shenzhou/nsh/defconfig
index 7aa442e12e..0c18b129f2 100644
--- a/configs/shenzhou/nsh/defconfig
+++ b/configs/shenzhou/nsh/defconfig
@@ -304,66 +304,22 @@ CONFIG_DEV_NULL=y
 # CONFIG_DEV_ZERO is not set
 # CONFIG_LOOP is not set
 # CONFIG_RAMDISK is not set
-
-#
-# CAN Driver Options
-#
 # CONFIG_CAN is not set
-
-#
-# PWM Driver Options
-#
 # CONFIG_PWM is not set
-
-#
-# I2C Driver Options
-#
 # CONFIG_I2C is not set
-
-#
-# SPI Driver Options
-#
 CONFIG_SPI=y
 # CONFIG_SPI_OWNBUS is not set
 CONFIG_SPI_EXCHANGE=y
 CONFIG_SPI_CMDDATA=y
-
-#
-# RTC Driver Options
-#
 CONFIG_RTC=y
 # CONFIG_RTC_DATETIME is not set
 # CONFIG_RTC_HIRES is not set
 # CONFIG_RTC_ALARM is not set
-
-#
-# Watchdog Driver Options
-#
 # CONFIG_WATCHDOG is not set
-
-#
-# Analog Driver Options
-#
 # CONFIG_ANALOG is not set
-
-#
-# Block-to-Character Driver Support
-#
 # CONFIG_BCH is not set
-
-#
-# Input device Driver Options
-#
 # CONFIG_INPUT is not set
-
-#
-# LCD Driver Options
-#
 # CONFIG_LCD is not set
-
-#
-# MMCSD Driver Options
-#
 CONFIG_MMCSD=y
 CONFIG_MMCSD_NSLOTS=1
 # CONFIG_MMCSD_READONLY is not set
@@ -373,42 +329,14 @@ CONFIG_MMCSD_HAVECARDDETECT=y
 CONFIG_MMCSD_SPI=y
 CONFIG_MMCSD_SPICLOCK=12500000
 # CONFIG_MMCSD_SDIO is not set
-
-#
-# I2C Driver Options
-#
 # CONFIG_MTD is not set
-
-#
-# Network Device Driver Options
-#
 # CONFIG_NETDEVICES is not set
 # CONFIG_NET_SLIP is not set
-
-#
-# Pipe Options
-#
 # CONFIG_PIPES is not set
-
-#
-# Power Management Options
-#
 # CONFIG_PM is not set
 # CONFIG_POWER is not set
-
-#
-# Sensor Driver Options
-#
 # CONFIG_SENSORS is not set
-
-#
-# Osmocom-bb Sercomm Driver Options
-#
 # CONFIG_SERCOMM_CONSOLE is not set
-
-#
-# Serial Driver Options
-#
 CONFIG_SERIAL=y
 # CONFIG_LOWLEVEL_CONSOLE is not set
 # CONFIG_16550_UART is not set
@@ -427,20 +355,8 @@ CONFIG_USART2_BAUD=115200
 CONFIG_USART2_BITS=8
 CONFIG_USART2_PARITY=0
 CONFIG_USART2_2STOP=0
-
-#
-# USB Device Driver Options
-#
 # CONFIG_USBDEV is not set
-
-#
-# USB Host Driver Options
-#
 # CONFIG_USBHOST is not set
-
-#
-# Wireless Device Driver Options
-#
 # CONFIG_WIRELESS is not set
 
 #
@@ -496,6 +412,7 @@ CONFIG_FAT_LCNAMES=y
 CONFIG_FAT_LFN=y
 CONFIG_FAT_MAXFNAME=32
 # CONFIG_FS_FATTIME is not set
+# CONFIG_FAT_DMAMEMORY is not set
 # CONFIG_FS_RAMMAP is not set
 # CONFIG_NFS is not set
 # CONFIG_FS_NXFFS is not set
@@ -511,6 +428,7 @@ CONFIG_FAT_MAXFNAME=32
 #
 # CONFIG_MM_SMALL is not set
 CONFIG_MM_REGIONS=1
+# CONFIG_GRAN is not set
 
 #
 # Library Routines