221 lines
7.6 KiB
Plaintext
221 lines
7.6 KiB
Plaintext
Architecture-Specific Code
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^^^^^^^^^^^^^^^^^^^^^^^^^^
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Table of Contents
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^^^^^^^^^^^^^^^^^
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o Architecture-Specific Code
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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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Architecture-Specific Code
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^^^^^^^^^^^^^^^^^^^^^^^^^^
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The NuttX configuration consists of:
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o Processor architecture specific files. These are the files contained
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in the arch/<arch-name>/ directory discussed in this README.
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o Chip/SoC specific files. Each processor processor architecture
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is embedded in chip or System-on-a-Chip (SoC) architecture. The
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full chip architecture includes the processor architecture plus
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chip-specific interrupt logic, general purpose I/O (GIO) logic, and
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specialized, internal peripherals (such as UARTs, USB, etc.).
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These chip-specific files are contained within chip-specific
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sub-directories in the arch/<arch-name>/ directory and are selected
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via the CONFIG_ARCH_name selection
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o Board specific files. In order to be usable, the chip must be
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contained in a board environment. The board configuration defines
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additional properties of the board including such things as
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peripheral LEDs, external peripherals (such as network, USB, etc.).
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These board-specific configuration files can be found in the
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configs/<board-name>/ sub-directories.
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This README will address the processor architecture specific files
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that are contained in the arch/<arch-name>/ directory. The file
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include/nuttx/arch.h identifies all of the APIs that must
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be provided by this architecture specific logic. (It also includes
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arch/<arch-name>/arch.h as described below).
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Directory Structure
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^^^^^^^^^^^^^^^^^^^
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The arch directory contains architecture specific logic. The complete
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board port in is defined by the architecture-specific code in this
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directory (plus the board-specific configurations in the config/
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subdirectory). Each architecture must provide a subdirectory <arch-name>
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under arch/ with the following characteristics:
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<arch-name>/
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|-- include/
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| |--<chip-name>/
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| | `-- (chip-specific header files)
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| |--<other-chips>/
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| |-- arch.h
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| |-- irq.h
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| `-- types.h
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`-- src/
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|--<chip-name>/
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| `-- (chip-specific source files)
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|--<other-chips>/
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|-- Makefile
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`-- (architecture-specific source files)
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Summary of Files
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^^^^^^^^^^^^^^^^
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include/<chip-name>/
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This sub-directory contains chip-specific header files.
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include/arch.h
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This is a hook for any architecture specific definitions that may
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be needed by the system. It is included by include/nuttx/arch.h
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include/types.h
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This provides architecture/toolchain-specific definitions for
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standard types. This file should typedef:
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sbyte, ubyte, uint8, boolean, sint16, uint16, sint32, uint32
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and
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sint64, uint64
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if the architecture supports 64-bit integers.
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irqstate_t
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Must be defined to the be the size required to hold the interrupt
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enable/disable state.
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This file will be included by include/sys/types.h and be made
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available to all files.
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include/irq.h
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This file needs to define some architecture specific functions (usually
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inline if the compiler supports inlining) and structure. These include:
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- struct xcptcontext. This structures represents the saved context
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of a thread.
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- irqstate_t irqsave(void) -- Used to disable all interrupts.
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- void irqrestore(irqstate_t flags) -- Used to restore interrupt
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enables to the same state as before irqsave was called.
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This file must also define NR_IRQS, the total number of IRQs supported
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by the board.
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src/<chip-name>/
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This sub-directory contains chip-specific source files.
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src/Makefile
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This makefile will be executed to build the targets src/libup.a and
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src/up_head.o. The up_head.o file holds the entry point into the system
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(power-on reset entry point, for example). It will be used in
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the final link with libup.a and other system archives to generate the
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final executable.
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Supported Architectures
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^^^^^^^^^^^^^^^^^^^^^^^
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arch/sim - Linux/Cygwin simulation
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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 development.
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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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arch/arm - ARM-based micro-controllers
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This directory holds common ARM architectures. At present, this includes
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the following subdirectories:
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arch/arm/include and arch/arm/src/common
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Common ARM logic.
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arch/arm/include/c5471 and arch/arm/src/c5471
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TI TMS320C5471 (also called TMS320DM180 or just C5471).
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NuttX operates on the ARM7 of this dual core processor. This port
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complete, verified, and included in the NuttX release 0.1.1.
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arch/arm/include/dm320 and arch/arm/src/dm320
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TI TMS320DM320 (also called just DM320).
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NuttX operates on the ARM9EJS of this dual core processor. This port
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complete, verified, and included in the NuttX release 0.2.1.
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arch/arm/include/lpc214x and arch/arm/src/lpc214x
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These directories provide support for NXP LPC214x family of
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processors. This port boots and passes the OS test (examples/ostest).
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The port is complete and verifed. As of NuttX 0.3.17, the port includes:
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timer interrupts, serial console, USB driver, and SPI-based MMC/SD card
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support. A verifed NuttShell (NSH) configuration is also available.
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arch/arm/include/str71x and arch/arm/src/str71x
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These directories provide support for the STMicro STR71x processors.
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Coding is complete on the basic port (boot logic, system time, serial console),
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but no testing has been performed due to some problems I am having with my
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JTAG wiggler and OpenOCD on Linux.
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arch/m68322
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A work in progress.
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STATUS: Stalled for the moment.
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arch/sh - SuperH and related Hitachi/Renesas microcontrollers
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arch/sh/include and arch/sh/src/common
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Common SuperH logic.
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arch/sh/include/shs and arch/sh/src/sh1
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Support for the SH-1 processor.
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arch/pjrc-8051 - 8051/52 microcontrollers
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8051 Microcontroller. This port is not quite ready for prime time.
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arch/z16 - ZiLOG 16-bit processors
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This directory holds related, 16-bit architectures from ZiLOG. At
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present, this includes the following subdirectories:
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arch/z16/include and arch/z16/src/common
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Common microcontroller logic.
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arch/z16/include/z16f and arch/z16/src/z16f
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ZiLOG z16f Microcontroller.
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STATUS: Released in nuttx-0.3.7. Fully functional other than issues
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addressed in ${TOPDIR}/TODO.
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arch/z80 - ZiLOG 8-bit microcontrollers
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This directory holds related, 8-bit architectures from ZiLOG. At
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present, this includes the following subdirectories:
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arch/z80/include and arch/z80/src/common
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Common microcontroller logic.
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arch/z80/include/z80 and arch/z80/src/z80
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Classic ZiLOG z80 Microcontroller.
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STATUS: Functional with no known defects. There are still several
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OS features that have not yet been tested (e.g., networking).
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arch/z80/include/z8 and arch/z80/src/z8
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ZiLOG Z8Encore! Microcontroller
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arch/z80/include/ez80 and arch/z80/src/ez80
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ZiLOG ez80 Acclaim! Microcontroller
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The following architecture directories are deprecated. They have been
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replaced by the logic in arm/arm and will deleted at some point in the
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future.
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arch/c5471
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Replaced with arch/arm/include/c5471 and arch/arm/src/c5471
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arch/dm320
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Replaced with arch/arm/include/dm320 and arch/arm/src/dm320
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Other ports for the for the TI TMS320DM270 and for MIPS are in various states
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of progress
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