############################################################################
# configs/px4io/nsh/defconfig
#
#   Copyright (C) 2012 PX4 Development Team. All rights reserved.
#   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
#   Author: Gregory Nutt <gnutt@nuttx.org>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in
#    the documentation and/or other materials provided with the
#    distribution.
# 3. Neither the name NuttX nor the names of its contributors may be
#    used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
############################################################################
#
# architecture selection
#
# CONFIG_ARCH - identifies the arch subdirectory and, hence, the
#   processor architecture.
# CONFIG_ARCH_family - for use in C code.  This identifies the
#   particular chip family that the architecture is implemented
#   in.
# CONFIG_ARCH_architecture - for use in C code.  This identifies the
#   specific architecture within the chip family.
# CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory
# CONFIG_ARCH_CHIP_name - For use in C code
# CONFIG_ARCH_BOARD - identifies the configs subdirectory and, hence,
#   the board that supports the particular chip or SoC.
# CONFIG_ARCH_BOARD_name - for use in C code
# CONFIG_ENDIAN_BIG - define if big endian (default is little endian)
# CONFIG_BOARD_LOOPSPERMSEC - for delay loops
# CONFIG_DRAM_SIZE - Describes the installed DRAM.
# CONFIG_DRAM_START - The start address of DRAM (physical)
# CONFIG_ARCH_IRQPRIO - The ST32F100CB supports interrupt prioritization
# CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
#   stack. If defined, this symbol is the size of the interrupt
#   stack in bytes.  If not defined, the user task stacks will be
#   used during interrupt handling.
# CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions
# CONFIG_ARCH_BOOTLOADER - Set if you are using a bootloader.
# CONFIG_ARCH_LEDS -  Use LEDs to show state. Unique to board architecture.
# CONFIG_ARCH_BUTTONS -  Enable support for buttons. Unique to board architecture.
# CONFIG_ARCH_CALIBRATION - Enables some build in instrumentation that
#   cause a 100 second delay during boot-up.  This 100 second delay
#   serves no purpose other than it allows you to calibrate
#   CONFIG_BOARD_LOOPSPERMSEC.  You simply use a stop watch to measure
#   the 100 second delay then adjust CONFIG_BOARD_LOOPSPERMSEC until
#   the delay actually is 100 seconds.
# CONFIG_ARCH_DMA - Support DMA initialization
#
CONFIG_ARCH="arm"
CONFIG_ARCH_ARM=y
CONFIG_ARCH_CORTEXM3=y
CONFIG_ARCH_CHIP="stm32"
CONFIG_ARCH_CHIP_STM32F100C8=y
CONFIG_ARCH_BOARD="px4io"
CONFIG_ARCH_BOARD_PX4IO=y
CONFIG_BOARD_LOOPSPERMSEC=2000
CONFIG_DRAM_SIZE=0x00002000
CONFIG_DRAM_START=0x20000000
CONFIG_ARCH_IRQPRIO=y
CONFIG_ARCH_INTERRUPTSTACK=n
CONFIG_ARCH_STACKDUMP=y
CONFIG_ARCH_BOOTLOADER=n
CONFIG_ARCH_LEDS=n
CONFIG_ARCH_BUTTONS=n
CONFIG_ARCH_CALIBRATION=n
CONFIG_ARCH_DMA=y
CONFIG_ARCH_MATH_H=y

CONFIG_ARMV7M_CMNVECTOR=y

#
# JTAG Enable settings (by default JTAG-DP and SW-DP are disabled):
#
#   CONFIG_STM32_DFU - Use the DFU bootloader, not JTAG
#
# JTAG Enable options:
#
#   CONFIG_STM32_JTAG_FULL_ENABLE - Enables full SWJ (JTAG-DP + SW-DP)
#   CONFIG_STM32_JTAG_NOJNTRST_ENABLE - Enables full SWJ (JTAG-DP + SW-DP)
#     but without JNTRST.
#   CONFIG_STM32_JTAG_SW_ENABLE - Set JTAG-DP disabled and SW-DP enabled
#
CONFIG_STM32_DFU=n
CONFIG_STM32_JTAG_FULL_ENABLE=y
CONFIG_STM32_JTAG_NOJNTRST_ENABLE=n
CONFIG_STM32_JTAG_SW_ENABLE=n

#
# Individual subsystems can be enabled:
#
# AHB: 
CONFIG_STM32_DMA1=y
CONFIG_STM32_DMA2=n
CONFIG_STM32_CRC=n
# APB1:
# Timers 2,3 and 4 are owned by the PWM driver
CONFIG_STM32_TIM2=n
CONFIG_STM32_TIM3=n
CONFIG_STM32_TIM4=n
CONFIG_STM32_TIM5=n
CONFIG_STM32_TIM6=n
CONFIG_STM32_TIM7=n
CONFIG_STM32_WWDG=n
CONFIG_STM32_SPI2=n
CONFIG_STM32_USART2=y
CONFIG_STM32_USART3=y
CONFIG_STM32_I2C1=y
CONFIG_STM32_I2C2=n
CONFIG_STM32_BKP=n
CONFIG_STM32_PWR=n
CONFIG_STM32_DAC=n
# APB2:
# We use our own ADC driver, but leave this on for clocking purposes.
CONFIG_STM32_ADC1=y
CONFIG_STM32_ADC2=n
# TIM1 is owned by the HRT
CONFIG_STM32_TIM1=n
CONFIG_STM32_SPI1=n
CONFIG_STM32_TIM8=n
CONFIG_STM32_USART1=y
CONFIG_STM32_ADC3=n


#
# STM32F100 specific serial device driver settings
#
# CONFIG_USARTn_SERIAL_CONSOLE - selects the USARTn for the
#   console and ttys0 (default is the USART1).
# CONFIG_USARTn_RXBUFSIZE - Characters are buffered as received.
#   This specific the size of the receive buffer
# CONFIG_USARTn_TXBUFSIZE - Characters are buffered before
#   being sent.  This specific the size of the transmit buffer
# CONFIG_USARTn_BAUD - The configure BAUD of the UART.  Must be
# CONFIG_USARTn_BITS - The number of bits.  Must be either 7 or 8.
# CONFIG_USARTn_PARTIY - 0=no parity, 1=odd parity, 2=even parity
# CONFIG_USARTn_2STOP - Two stop bits
#
CONFIG_SERIAL_TERMIOS=y
CONFIG_STANDARD_SERIAL=y

CONFIG_USART1_SERIAL_CONSOLE=y
CONFIG_USART2_SERIAL_CONSOLE=n
CONFIG_USART3_SERIAL_CONSOLE=n

CONFIG_USART1_TXBUFSIZE=64
CONFIG_USART2_TXBUFSIZE=64
CONFIG_USART3_TXBUFSIZE=64

CONFIG_USART1_RXBUFSIZE=64
CONFIG_USART2_RXBUFSIZE=64
CONFIG_USART3_RXBUFSIZE=64

CONFIG_USART1_BAUD=115200
CONFIG_USART2_BAUD=115200
CONFIG_USART3_BAUD=115200

CONFIG_USART1_BITS=8
CONFIG_USART2_BITS=8
CONFIG_USART3_BITS=8

CONFIG_USART1_PARITY=0
CONFIG_USART2_PARITY=0
CONFIG_USART3_PARITY=0

CONFIG_USART1_2STOP=0
CONFIG_USART2_2STOP=0
CONFIG_USART3_2STOP=0

CONFIG_USART1_RXDMA=y
SERIAL_HAVE_CONSOLE_DMA=y
# Conflicts with I2C1 DMA
CONFIG_USART2_RXDMA=n
CONFIG_USART3_RXDMA=y

#
# PX4IO specific driver settings
#
# CONFIG_HRT_TIMER
#   Enables the high-resolution timer.  The board definition must
#   set HRT_TIMER and HRT_TIMER_CHANNEL to the timer and capture/
#   compare channels to be used.
# CONFIG_HRT_PPM
#   Enables R/C PPM input using the HRT.  The board definition must
#   set HRT_PPM_CHANNEL to the timer capture/compare channel to be
#   used, and define GPIO_PPM_IN to configure the appropriate timer
#   GPIO.
# CONFIG_PWM_SERVO
#   Enables the PWM servo driver.  The driver configuration must be
#   supplied by the board support at initialisation time.
#   Note that USART2 must be disabled on the PX4 board for this to
#   be available.
#
#
CONFIG_HRT_TIMER=y
CONFIG_HRT_PPM=y

#
# General build options
#
# CONFIG_RRLOAD_BINARY - make the rrload binary format used with
#   BSPs from www.ridgerun.com using the tools/mkimage.sh script
# CONFIG_INTELHEX_BINARY - make the Intel HEX binary format
#   used with many different loaders using the GNU objcopy program
#   Should not be selected if you are not using the GNU toolchain.
# CONFIG_MOTOROLA_SREC - make the Motorola S-Record binary format
#   used with many different loaders using the GNU objcopy program
#   Should not be selected if you are not using the GNU toolchain.
# CONFIG_RAW_BINARY - make a raw binary format file used with many
#   different loaders using the GNU objcopy program.  This option
#   should not be selected if you are not using the GNU toolchain.
# CONFIG_HAVE_LIBM - toolchain supports libm.a
#
CONFIG_RRLOAD_BINARY=n
CONFIG_INTELHEX_BINARY=n
CONFIG_MOTOROLA_SREC=n
CONFIG_RAW_BINARY=y
CONFIG_HAVE_LIBM=n

#
# General OS setup
#
# CONFIG_APPS_DIR - Identifies the relative path to the directory
#   that builds the application to link with NuttX.  Default: ../apps
# CONFIG_DEBUG - enables built-in debug options
# CONFIG_DEBUG_VERBOSE - enables verbose debug output
# CONFIG_DEBUG_SYMBOLS - build without optimization and with
#   debug symbols (needed for use with a debugger).
# CONFIG_HAVE_CXX - Enable support for C++
# CONFIG_HAVE_CXXINITIALIZE - The platform-specific logic includes support
#   for initialization of static C++ instances for this architecture
#   and for the selected toolchain (via up_cxxinitialize()).
# 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
#   handle and enables the API mm_addregion(start, end);
# 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
#   system timer interrupts at some interrupt interval other
#   than 10 msec.
# CONFIG_RR_INTERVAL - The round robin timeslice will be set
#   this number of milliseconds;  Round robin scheduling can
#   be disabled by setting this value to zero.
# CONFIG_SCHED_INSTRUMENTATION - enables instrumentation in 
#   scheduler to monitor system performance
# CONFIG_TASK_NAME_SIZE - Spcifies that maximum size of a
#   task name to save in the TCB.  Useful if scheduler
#   instrumentation is selected.  Set to zero to disable.
# CONFIG_START_YEAR, CONFIG_START_MONTH, CONFIG_START_DAY -
#   Used to initialize the internal time logic.
# CONFIG_GREGORIAN_TIME - Enables Gregorian time conversions.
#   You would only need this if you are concerned about accurate
#   time conversions in the past or in the distant future.
# CONFIG_JULIAN_TIME - Enables Julian time conversions. You
#   would only need this if you are concerned about accurate
#   time conversion in the distand past.  You must also define
#   CONFIG_GREGORIAN_TIME in order to use Julian time.
# CONFIG_DEV_CONSOLE - Set if architecture-specific logic
#   provides /dev/console.  Enables stdout, stderr, stdin.
# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
#   driver (minimul support)
# CONFIG_MUTEX_TYPES: Set to enable support for recursive and
#   errorcheck mutexes. Enables pthread_mutexattr_settype().
# CONFIG_PRIORITY_INHERITANCE : Set to enable support for priority
#   inheritance on mutexes and semaphores. 
# CONFIG_SEM_PREALLOCHOLDERS: This setting is only used if priority
#   inheritance is enabled.  It defines the maximum number of
#   different threads (minus one) that can take counts on a
#   semaphore with priority inheritance support.  This may be 
#   set to zero if priority inheritance is disabled OR if you
#   are only using semaphores as mutexes (only one holder) OR
#   if no more than two threads participate using a counting
#   semaphore.
# CONFIG_SEM_NNESTPRIO.  If priority inheritance is enabled,
#   then this setting is the maximum number of higher priority
#   threads (minus 1) than can be waiting for another thread
#   to release a count on a semaphore.  This value may be set
#   to zero if no more than one thread is expected to wait for
#   a semaphore.
# CONFIG_FDCLONE_DISABLE. Disable cloning of all file descriptors
#   by task_create() when a new task is started.  If set, all
#   files/drivers will appear to be closed in the new task.
# CONFIG_FDCLONE_STDIO. Disable cloning of all but the first
#   three file descriptors (stdin, stdout, stderr) by task_create()
#   when a new task is started. If set, all files/drivers will
#   appear to be closed in the new task except for stdin, stdout,
#   and stderr.
# CONFIG_SDCLONE_DISABLE. Disable cloning of all socket
#   desciptors by task_create() when a new task is started. If
#   set, all sockets will appear to be closed in the new task.
# CONFIG_SCHED_WORKQUEUE.  Create a dedicated "worker" thread to
#  handle delayed processing from interrupt handlers.  This feature
#  is required for some drivers but, if there are not complaints,
#  can be safely disabled.  The worker thread also performs
#  garbage collection -- completing any delayed memory deallocations
#  from interrupt handlers.  If the worker thread is disabled,
#  then that clean will be performed by the IDLE thread instead
#  (which runs at the lowest of priority and may not be appropriate
#  if memory reclamation is of high priority).  If CONFIG_SCHED_WORKQUEUE
#  is enabled, then the following options can also be used:
# CONFIG_SCHED_WORKPRIORITY - The execution priority of the worker
#  thread.  Default: 50
# CONFIG_SCHED_WORKPERIOD - How often the worker thread checks for
#  work in units of microseconds.  Default: 50*1000 (50 MS).
# CONFIG_SCHED_WORKSTACKSIZE - The stack size allocated for the worker
#  thread.  Default: CONFIG_IDLETHREAD_STACKSIZE.
# CONFIG_SIG_SIGWORK - The signal number that will be used to wake-up
#  the worker thread.  Default: 4
# CONFIG_SCHED_WAITPID - Enable the waitpid() API
# CONFIG_SCHED_ATEXIT - Enabled the atexit() API
#
CONFIG_USER_ENTRYPOINT="user_start"
#CONFIG_APPS_DIR=
CONFIG_DEBUG=n
CONFIG_DEBUG_VERBOSE=n
CONFIG_DEBUG_SYMBOLS=y
CONFIG_DEBUG_FS=n
CONFIG_DEBUG_GRAPHICS=n
CONFIG_DEBUG_LCD=n
CONFIG_DEBUG_USB=n
CONFIG_DEBUG_NET=n
CONFIG_DEBUG_RTC=n
CONFIG_DEBUG_ANALOG=n
CONFIG_DEBUG_PWM=n
CONFIG_DEBUG_CAN=n
CONFIG_DEBUG_I2C=n
CONFIG_DEBUG_INPUT=n

CONFIG_MSEC_PER_TICK=1
CONFIG_HAVE_CXX=y
CONFIG_HAVE_CXXINITIALIZE=y
CONFIG_MM_REGIONS=1
CONFIG_MM_SMALL=y
CONFIG_ARCH_LOWPUTC=y
CONFIG_RR_INTERVAL=0
CONFIG_SCHED_INSTRUMENTATION=n
CONFIG_TASK_NAME_SIZE=8
CONFIG_START_YEAR=1970
CONFIG_START_MONTH=1
CONFIG_START_DAY=1
CONFIG_GREGORIAN_TIME=n
CONFIG_JULIAN_TIME=n
# this eats ~1KiB of RAM ... work out why
CONFIG_DEV_CONSOLE=y
CONFIG_DEV_LOWCONSOLE=n
CONFIG_MUTEX_TYPES=n
CONFIG_PRIORITY_INHERITANCE=n
CONFIG_SEM_PREALLOCHOLDERS=0
CONFIG_SEM_NNESTPRIO=0
CONFIG_FDCLONE_DISABLE=y
CONFIG_FDCLONE_STDIO=y
CONFIG_SDCLONE_DISABLE=y
CONFIG_SCHED_WORKQUEUE=n
CONFIG_SCHED_WORKPRIORITY=50
CONFIG_SCHED_WORKPERIOD=50000
CONFIG_SCHED_WORKSTACKSIZE=1024
CONFIG_SIG_SIGWORK=4
CONFIG_SCHED_WAITPID=n
CONFIG_SCHED_ATEXIT=n

#
# The following can be used to disable categories of
# APIs supported by the OS.  If the compiler supports
# weak functions, then it should not be necessary to
# disable functions unless you want to restrict usage
# of those APIs.
#
# There are certain dependency relationships in these
# features.
#
# o mq_notify logic depends on signals to awaken tasks
#   waiting for queues to become full or empty.
# o pthread_condtimedwait() depends on signals to wake
#   up waiting tasks.
#
CONFIG_DISABLE_CLOCK=n
CONFIG_DISABLE_POSIX_TIMERS=y
CONFIG_DISABLE_PTHREAD=y
CONFIG_DISABLE_SIGNALS=y
CONFIG_DISABLE_MQUEUE=y
CONFIG_DISABLE_MOUNTPOINT=y
CONFIG_DISABLE_ENVIRON=y
CONFIG_DISABLE_POLL=y

#
# Misc libc settings
#
# CONFIG_NOPRINTF_FIELDWIDTH - sprintf-related logic is a
#   little smaller if we do not support fieldwidthes
#
CONFIG_NOPRINTF_FIELDWIDTH=n

#
# Allow for architecture optimized implementations
#
# The architecture can provide optimized versions of the
# following to improve system performance
#
CONFIG_ARCH_MEMCPY=n
CONFIG_ARCH_MEMCMP=n
CONFIG_ARCH_MEMMOVE=n
CONFIG_ARCH_MEMSET=n
CONFIG_ARCH_STRCMP=n
CONFIG_ARCH_STRCPY=n
CONFIG_ARCH_STRNCPY=n
CONFIG_ARCH_STRLEN=n
CONFIG_ARCH_STRNLEN=n
CONFIG_ARCH_BZERO=n

#
# Sizes of configurable things (0 disables)
#
# CONFIG_MAX_TASKS - The maximum number of simultaneously
#   active tasks.  This value must be a power of two.
# CONFIG_MAX_TASK_ARGS - This controls the maximum number of
#   of parameters that a task may receive (i.e., maxmum value
#   of 'argc')
# CONFIG_NPTHREAD_KEYS - The number of items of thread-
#   specific data that can be retained
# CONFIG_NFILE_DESCRIPTORS - The maximum number of file
#   descriptors (one for each open)
# CONFIG_NFILE_STREAMS - The maximum number of streams that
#   can be fopen'ed
# CONFIG_NAME_MAX - The maximum size of a file name.
# CONFIG_STDIO_BUFFER_SIZE - Size of the buffer to allocate
#   on fopen. (Only if CONFIG_NFILE_STREAMS > 0)
# CONFIG_STDIO_LINEBUFFER - If standard C buffered I/O is enabled
#   (CONFIG_STDIO_BUFFER_SIZE > 0), then this option may be added
#   to force automatic, line-oriented flushing the output buffer
#   for putc(), fputc(), putchar(), puts(), fputs(), printf(),
#   fprintf(), and vfprintf().  When a newline is encountered in
#   the output string, the output buffer will be flushed.  This
#   (slightly) increases the NuttX footprint but supports the kind
#   of behavior that people expect for printf().
# CONFIG_NUNGET_CHARS - Number of characters that can be
#   buffered by ungetc() (Only if CONFIG_NFILE_STREAMS > 0)
# CONFIG_PREALLOC_MQ_MSGS - The number of pre-allocated message
#   structures.  The system manages a pool of preallocated
#   message structures to minimize dynamic allocations
# CONFIG_MQ_MAXMSGSIZE - Message structures are allocated with
#   a fixed payload size given by this settin (does not include
#   other message structure overhead.
# CONFIG_MAX_WDOGPARMS - Maximum number of parameters that
#   can be passed to a watchdog handler
# CONFIG_PREALLOC_WDOGS - The number of pre-allocated watchdog
#   structures.  The system manages a pool of preallocated
#   watchdog structures to minimize dynamic allocations
# CONFIG_PREALLOC_TIMERS - The number of pre-allocated POSIX
#   timer structures.  The system manages a pool of preallocated
#   timer structures to minimize dynamic allocations.  Set to
#   zero for all dynamic allocations.
#
CONFIG_MAX_TASKS=4
CONFIG_MAX_TASK_ARGS=4
CONFIG_NPTHREAD_KEYS=2
CONFIG_NFILE_DESCRIPTORS=8
CONFIG_NFILE_STREAMS=0
CONFIG_NAME_MAX=12
CONFIG_STDIO_BUFFER_SIZE=32
CONFIG_STDIO_LINEBUFFER=n
CONFIG_NUNGET_CHARS=2
CONFIG_PREALLOC_MQ_MSGS=4
CONFIG_MQ_MAXMSGSIZE=32
CONFIG_MAX_WDOGPARMS=2
CONFIG_PREALLOC_WDOGS=4
CONFIG_PREALLOC_TIMERS=0


#
# Settings for apps/nshlib
#
# CONFIG_NSH_BUILTIN_APPS - Support external registered,
#   "named" applications that can be executed from the NSH
#   command line (see apps/README.txt for more information).
# CONFIG_NSH_FILEIOSIZE - Size of a static I/O buffer
# CONFIG_NSH_STRERROR - Use strerror(errno)
# CONFIG_NSH_LINELEN - Maximum length of one command line
# CONFIG_NSH_NESTDEPTH - Max number of nested if-then[-else]-fi
# CONFIG_NSH_DISABLESCRIPT - Disable scripting support
# CONFIG_NSH_DISABLEBG - Disable background commands
# CONFIG_NSH_ROMFSETC - Use startup script in /etc
# CONFIG_NSH_CONSOLE - Use serial console front end
# CONFIG_NSH_TELNET - Use telnetd console front end
# CONFIG_NSH_ARCHINIT - Platform provides architecture
#   specific initialization (nsh_archinitialize()).
#

# Disable NSH completely
CONFIG_NSH_CONSOLE=n

#
# Stack and heap information
#
# CONFIG_BOOT_RUNFROMFLASH - Some configurations support XIP
#   operation from FLASH but must copy initialized .data sections to RAM.
#   (should also be =n for the STM3210E-EVAL which always runs from flash)
# CONFIG_BOOT_COPYTORAM -  Some configurations boot in FLASH
#   but copy themselves entirely into RAM for better performance.
# CONFIG_CUSTOM_STACK - The up_ implementation will handle
#   all stack operations outside of the nuttx model.
# CONFIG_STACK_POINTER - The initial stack pointer (arm7tdmi only)
# CONFIG_IDLETHREAD_STACKSIZE - The size of the initial stack.
#  This is the thread that (1) performs the inital boot of the system up
#  to the point where user_start() is spawned, and (2) there after is the
#  IDLE thread that executes only when there is no other thread ready to
#  run.
# CONFIG_USERMAIN_STACKSIZE - The size of the stack to allocate
#  for the main user thread that begins at the user_start() entry point.
# CONFIG_PTHREAD_STACK_MIN - Minimum pthread stack size
# CONFIG_PTHREAD_STACK_DEFAULT - Default pthread stack size
# CONFIG_HEAP_BASE - The beginning of the heap
# CONFIG_HEAP_SIZE - The size of the heap
#
CONFIG_BOOT_RUNFROMFLASH=n
CONFIG_BOOT_COPYTORAM=n
CONFIG_CUSTOM_STACK=n
CONFIG_STACK_POINTER=
CONFIG_IDLETHREAD_STACKSIZE=1024
CONFIG_USERMAIN_STACKSIZE=1200
CONFIG_PTHREAD_STACK_MIN=512
CONFIG_PTHREAD_STACK_DEFAULT=1024
CONFIG_HEAP_BASE=
CONFIG_HEAP_SIZE=
