231 lines
8.5 KiB
Plaintext
231 lines
8.5 KiB
Plaintext
Board-Specific Configurations
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Table of Contents
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^^^^^^^^^^^^^^^^^
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o Board-Specific Configurations
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o Summary of Files
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o Supported Architectures
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o Configuring NuttX
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Board-Specific Configurations
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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The configs/ subdirectory contains configuration data for each board. These
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board-specific configurations plus the architecture-specific configurations in
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the arch/ subdirectory complete define a customized port of NuttX.
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Directory Structure
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^^^^^^^^^^^^^^^^^^^
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The configs directory contains board specific configurationlogic. Each
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board must provide a subdirectory <board-name> under configs/ with the
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following characteristics:
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<board-name>
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|-- include/
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|-- src/
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| `-- Makefile
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|-- Make.defs
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|-- defconfig
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`-- setenv.sh
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Summary of Files
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^^^^^^^^^^^^^^^^
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include/ -- This directory contains board specific header files. This
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directory will be linked as include/arch/board at configuration time and
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can be included via '#include <arch/board/header.h>'. These header file
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can only be included by files in arch/<arch-name>include/ and
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arch/<arch-name>/src
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src/ -- This directory contains board specific drivers. This
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directory will be linked as arch/<arch-name>/src/board at configuration
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time and will be integrated into the build system.
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src/Makefile -- This makefile will be invoked to build the board specific
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drivers. It must support the following targets: libext$(LIBEXT), clean,
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and distclean.
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Make.defs -- This makefile fragment provides architecture and
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tool-specific build options. It will be included by all other
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makefiles in the build (once it is installed). This make fragment
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should define:
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Tools: CC, LD, AR, NM, OBJCOPY, OBJDUMP
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Tool options: CFLAGS, LDFLAGS
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When this makefile fragment runs, it will be passed TOPDIR which
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is the path to the root directory of the build. This makefile
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fragment may include ${TOPDIR}/.config to perform configuration
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specific settings. For example, the CFLAGS will most likely be
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different if CONFIG_DEBUG=y.
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defconfig -- This is a configuration file similar to the Linux
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configuration file. In contains varialble/value pairs like:
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CONFIG_VARIABLE=value
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This configuration file will be used at build time:
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(1) as a makefile fragment included in other makefiles, and
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(2) to generate include/nuttx/config.h which is included by
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most C files in the system.
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The following variables are recognized by the build (you may
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also include architecture/board-specific settings).
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Architecture selection:
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CONFIG_ARCH - identifies the arch/ subdirectory
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CONFIG_ARCH_name - for use in C code
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General OS setup
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CONFIG_EXAMPLE - identifies the subdirectory in examples
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that will be used in the build
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CONFIG_DEBUG - enables built-in debug options
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CONFIG_DEBUG_VERBOSE - enables verbose debug output
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CONFIG_HAVE_LOWPUTC - architecture supports low-level, boot
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time console output
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CONFIG_MM_REGIONS - If the architecture includes multiple
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regions of memory to allocate from, this specifies the
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number of memory regions that the memory manager must
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handle and enables the API mm_addregion(start, end);
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CONFIG_RR_INTERVAL - The round robin timeslice will be set
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this number of milliseconds; Round robin scheduling can
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be disabled by setting this value to zero.
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CONFIG_SCHED_INSTRUMENTATION - enables instrumentation in
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scheduler to monitor system performance
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CONFIG_TASK_NAME_SIZE - Spcifies that maximum size of a
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task name to save in the TCB. Useful if scheduler
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instrumentation is selected. Set to zero to disable.
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CONFIG_START_YEAR, CONFIG_START_MONTH, CONFIG_START_DAY -
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Used to initialize the internal time logic.
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CONFIG_JULIAN_TIME - Enables Julian time conversions
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CONFIG_DEV_CONSOLE - Set if architecture-specific logic
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provides /dev/console. Enables stdout, stderr, stdin.
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The following can be used to disable categories of APIs supported
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by the OS. If the compiler supports weak functions, then it
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should not be necessary to disable functions unless you want to
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restrict usage of those APIs.
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There are certain dependency relationships in these features.
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o mq_notify logic depends on signals to awaken tasks
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waiting for queues to become full or empty.
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o pthread_condtimedwait() depends on signals to wake
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up waiting tasks.
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CONFIG_DISABLE_CLOCK, CONFIG_DISABLE_POSIX_TIMERS, CONFIG_DISABLE_PTHREAD.
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CONFIG_DISABLE_SIGNALS, CONFIG_DISABLE_MQUEUE
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Misc libc settings
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CONFIG_NOPRINTF_FIELDWIDTH - sprintf-related logic is a
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little smaller if we do not support fieldwidthes
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Allow for architecture optimized implementations
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The architecture can provide optimized versions of the
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following to improve sysem performance
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CONFIG_ARCH_MEMCPY, CONFIG_ARCH_MEMCMP, CONFIG_ARCH_MEMMOVE
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CONFIG_ARCH_MEMSET, CONFIG_ARCH_STRCMP, CONFIG_ARCH_STRCPY
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CONFIG_ARCH_STRNCPY, CONFIG_ARCH_STRLEN, CONFIG_ARCH_BZERO
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CONFIG_ARCH_KMALLOC, CONFIG_ARCH_KZMALLOC, CONFIG_ARCH_KFREE
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Sizes of configurable things (0 disables)
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CONFIG_MAX_TASKS - The maximum number of simultaneously
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active tasks. This value must be a power of two.
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CONFIG_NPTHREAD_KEYS - The number of items of thread-
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specific data that can be retained
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CONFIG_NFILE_DESCRIPTORS - The maximum number of file
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descriptors (one for each open)
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CONFIG_NFILE_STREAMS - The maximum number of streams that
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can be fopen'ed
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CONFIG_NAME_MAX - The maximum size of a file name.
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CONFIG_STDIO_BUFFER_SIZE - Size of the buffer to allocate
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on fopen. (Only if CONFIG_NFILE_STREAMS > 0)
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CONFIG_NUNGET_CHARS - Number of characters that can be
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buffered by ungetc() (Only if CONFIG_NFILE_STREAMS > 0)
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CONFIG_PREALLOC_MQ_MSGS - The number of pre-allocated message
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structures. The system manages a pool of preallocated
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message structures to minimize dynamic allocations
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CONFIG_MQ_MAXMSGSIZE - Message structures are allocated with
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a fixed payload size given by this settin (does not include
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other message structure overhead.
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CONFIG_PREALLOC_WDOGS - The number of pre-allocated watchdog
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structures. The system manages a pool of preallocated
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watchdog structures to minimize dynamic allocations
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Stack and heap information
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CONFIG_BOOT_FROM_FLASH - Some configurations support XIP
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operation from FLASH.
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CONFIG_STACK_POINTER - The initial stack pointer
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CONFIG_PROC_STACK_SIZE - The size of the initial stack
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CONFIG_PTHREAD_STACK_MIN - Minimum pthread stack size
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CONFIG_PTHREAD_STACK_DEFAULT - Default pthread stack size
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CONFIG_HEAP_BASE - The beginning of the heap
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CONFIG_HEAP_SIZE - The size of the heap
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setenv.sh -- This is a script that you can include that will be installed at
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the toplevel of the directory structure and can be sourced to set any
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necessary environment variables.
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Supported Boards
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^^^^^^^^^^^^^^^^
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configs/sim
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A user-mode port of NuttX to the x86 Linux platform is available.
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The purpose of this port is primarily to support OS feature developement.
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This port does not support interrupts or a real timer (and hence no
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round robin scheduler) Otherwise, it is complete.
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configs/c5471evm
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This is a port to the Spectrum Digital C5471 evaluation board. The
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C5471 is a dual core processor from TI with an ARM7TDMI general purpose
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processor and a c54 SDP. NuttX runs on the ARM core and is built with
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with a GNU arm-elf toolchain*. This port is complete, verified, and
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included in the NuttX release.
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configs/ntosd-dm320
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This port uses the Neuros OSD with a GNU arm-elf toolchain*:
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see http://wiki.neurostechnology.com/index.php/Developer_Welcome .
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NuttX operates on the ARM9EJS of this dual core processor.
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STATUS: This port is code complete, verified, and included in the
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NuttX 0.2.1 release.
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configs/m68322evb
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This is a work in progress for the venerable m68322evb board from
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Motorola.
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configs/pjrc-8051
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8051 Microcontroller. This port uses the PJRC 87C52 development system
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and the SDCC toolchain. This port is not quite ready for prime time.
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Other ports for the for the TI TMS320DM270, M683222 and for MIPS are in various
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states of progress
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Configuring NuttX
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^^^^^^^^^^^^^^^^^
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Configuring NuttX requires only copying
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configs/<board-name>/Make.def to ${TOPDIR}/Make.defs
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configs/<board-name>/setenv.sh to ${TOPDIR}/setenv.sh
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configs/<board-name>/defconfig to ${TOPDIR}/.config
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There is a script that automates these steps. The following steps will
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accomplish the same configuration:
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cd tools
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./configure.sh <board-name>
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