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README.txt |
Architecture-Specific Code ^^^^^^^^^^^^^^^^^^^^^^^^^^ Table of Contents ^^^^^^^^^^^^^^^^^ o Architecture-Specific Code o Summary of Files o Supported Architectures o Configuring NuttX Architecture-Specific Code ^^^^^^^^^^^^^^^^^^^^^^^^^^ The NuttX configuration consists of: o Processor architecture specific files. These are the files contained in the arch/<arch-name>/ directory discussed in this README. o Chip/SoC specific files. Each processor processor architecture is embedded in chip or System-on-a-Chip (SoC) architecture. The full chip architecture includes the processor architecture plus chip-specific interrupt logic, general purpose I/O (GIO) logic, and specialized, internal peripherals (such as UARTs, USB, etc.). These chip-specific files are contained within chip-specific sub-directories in the arch/<arch-name>/ directory and are selected via the CONFIG_ARCH_name selection o Board specific files. In order to be usable, the chip must be contained in a board environment. The board configuration defines additional properties of the board including such things as peripheral LEDs, external peripherals (such as network, USB, etc.). These board-specific configuration files can be found in the configs/<board-name>/ sub-directories. This README will address the processor architecture specific files that are contained in the arch/<arch-name>/ directory. The file include/nuttx/arch.h identifies all of the APIs that must be provided by this architecture specific logic. (It also includes arch/<arch-name>/arch.h as described below). Directory Structure ^^^^^^^^^^^^^^^^^^^ The arch directory contains architecture specific logic. The complete board port in is defined by the architecture-specific code in this directory (plus the board-specific configurations in the config/ subdirectory). Each architecture must provide a subdirectory <arch-name> under arch/ with the following characteristics: <arch-name>/ |-- include/ | |--<chip-name>/ | | `-- (chip-specific header files) | |--<other-chips>/ | |-- arch.h | |-- irq.h | `-- types.h `-- src/ |--<chip-name>/ | `-- (chip-specific source files) |--<other-chips>/ |-- Makefile `-- (architecture-specific source files) Summary of Files ^^^^^^^^^^^^^^^^ include/<chip-name>/ This sub-directory contains chip-specific header files. include/arch.h This is a hook for any architecture specific definitions that may be needed by the system. It is included by include/nuttx/arch.h include/types.h This provides architecture/toolchain-specific definitions for standard types. This file should typedef: _int8_t, _uint8_t, _int16_t, _uint16_t, _int32_t, _uint32_t and if the architecture supports 64-bit integers. _int24_t, _uint24_t, int64_t, uint64_t NOTE that these type names have a leading underscore character. This file will be included(indirectly) by include/stdint.h and typedef'ed to the final name without the underscore character. This roundabout way of doings things allows the stdint.h to be removed from the include/ directory in the event that the user prefers to use the definitions provided by their toolchain header files irqstate_t Must be defined to the be the size required to hold the interrupt enable/disable state. This file will be included by include/sys/types.h and be made available to all files. include/irq.h This file needs to define some architecture specific functions (usually inline if the compiler supports inlining) and structure. These include: - struct xcptcontext. This structures represents the saved context of a thread. - irqstate_t irqsave(void) -- Used to disable all interrupts. - void irqrestore(irqstate_t flags) -- Used to restore interrupt enables to the same state as before irqsave was called. This file must also define NR_IRQS, the total number of IRQs supported by the board. src/<chip-name>/ This sub-directory contains chip-specific source files. src/Makefile This makefile will be executed to build the targets src/libup.a and src/up_head.o. The up_head.o file holds the entry point into the system (power-on reset entry point, for example). It will be used in the final link with libup.a and other system archives to generate the final executable. Supported Architectures ^^^^^^^^^^^^^^^^^^^^^^^ arch/sim - Linux/Cygwin simulation A user-mode port of NuttX to the x86 Linux platform is available. The purpose of this port is primarily to support OS feature development. This port does not support interrupts or a real timer (and hence no round robin scheduler) Otherwise, it is complete. arch/arm - ARM-based micro-controllers This directory holds common ARM architectures. At present, this includes the following subdirectories: arch/arm/include and arch/arm/src/common Common ARM/Cortex-M3 logic. arch/arm/src/arm and arch/arm/include/arm Common ARM-specific logic arch/arm/src/armv7-m and arch/arm/include/armv7-m Common ARMv7-M logic (Cortex-M3 and Cortex-M4) arch/arm/include/c5471 and arch/arm/src/c5471 TI TMS320C5471 (also called TMS320DM180 or just C5471). NuttX operates on the ARM7 of this dual core processor. This port complete, verified, and included in the NuttX release 0.1.1. arch/arm/include/calypso and arch/arm/src/calypso TI "Calypso" MCU used in various cell phones (and, in particular, by the Osmocom-bb project). Like the c5471, NuttX operates on the ARM7 of this dual core processor. This port was contributed by Denis Carilki and includes the work of Denis, Alan Carvalho de Assis, and Stefan Richter. Calypso support first appeared in NuttX-6.17. arch/arm/include/dm320 and arch/arm/src/dm320 TI TMS320DM320 (also called just DM320). NuttX operates on the ARM9EJS of this dual core processor. This port complete, verified, and included in the NuttX release 0.2.1. arch/arm/include/imx and arch/arm/src/imx Freescale MC9328MX1 or i.MX1. This port uses the Freescale MX1ADS development board with a GNU arm-elf toolchain* under either Linux or Cygwin. STATUS: This port has stalled because of development tool issues. Coding is complete on the basic port (timer, serial console, SPI). arch/arm/include/lm3s and arch/arm/src/lm3s These directories contain support for the Luminary LMS family, particularly for the LM3S6918. The initial, release of this port was included in NuttX version 0.4.6. The current port includes timer, serial console, Ethernet, SSI, and microSD support. There are working configurations the NuttX OS test, to run the NuttShell (NSH), the NuttX networking test, and the uIP web server. arch/arm/include/lpc214x and arch/arm/src/lpc214x These directories provide support for NXP LPC214x family of ARM7TDMI processors. This port boots and passes the OS test (examples/ostest). The port is complete and verifed. As of NuttX 0.3.17, the port includes: timer interrupts, serial console, USB driver, and SPI-based MMC/SD card support. A verifed NuttShell (NSH) configuration is also available. arch/arm/include/lpc2378 and arch/arm/src/lpc2378. NXP LPC2378. Support is provided for the NXP LPC2378 MCU. This port was contributed by Rommel Marcelo is was first released in NuttX-5.3. STATUS: This port boots and passes the OS test (examples/ostest) and includes a working implementation of the NuttShell (NSH). The port is complete and verified. As of NuttX 5.3, the port includes only basic timer interrupts and serial console support. arch/arm/include/lpc31xx and arch/arm/src/lpc31xx These directories provide support for NXP LPC31xx family of ARM926EJ-S processors. The port for the NXP LPC3131 was first released in NuttX-5.1 (but was not functional until NuttX-5.2). STATUS: The basic EA3131 port is complete and verified in NuttX-5.2 This basic port includes basic boot-up, serial console, and timer interrupts. This port was extended in NuttX 5.3 with a USB high speed driver contributed by David Hewson. This port has been verified using the NuttX OS test, USB serial and mass storage tests and includes a working implementation of the NuttShell ((NSH)). This port was later extended to support additional members of the LPC31xx family including, specifically, the LPC3152. arch/arm/include/sam3u and arch/arm/src/sam3u Atmel AT91SAM3U. This port is for Atmel AT91SAM3U4E MCU. STATUS: The basic AT91SAM3U port was released in NuttX version 5.1. The basic port includes boot-up logic, interrupt driven serial console, and system timer interrupts. That release passes the NuttX OS test and is proven to have a valid OS implementation. A onfiguration to support the NuttShell is also included. arch/arm/include/stm32 and arch/arm/src/stm32 These directories contain support for the STMicro STM32 F1, F2, and F4 families. STATUS: The basic STM32 F1 port was released in NuttX version 0.4.12. and has continued to develop consistently over time. It now includes support for the F2 and F4 families and a rich offering of peripheral drivers. arch/arm/include/str71x and arch/arm/src/str71x These directories provide support for the STMicro STR71x processors. Coding is complete on the basic port (boot logic, system time, serial console), but no testing has been performed due to some problems I am having with my JTAG wiggler and OpenOCD on Linux. arch/avr This directory is dedicated to ports to the Atmel AVR (8-bit) and AVR32 (32-bit) MCU families. STATUS: Under development. arch/avr/include/avr and arch/avr/src/avr Common support for all 8-bit VR MCUs arch/avr/include/atmega and arch/avr/src/atmega Support specifically for the AVR ATMega family (specifically only for the ATMega128 at the moment). arch/avr/include/at90usb and arch/avr/src/at90usb Support specifically for the AVR AT90USB646, 647, 1286, and 1287 family. arch/avr/include/avr32 and arch/avr/src/avr32 Common support for all AVR32 MCUs arch/avr/include/at32uc3 and arch/avr/src/at32uc3 Support specifically for the AT32UC3Bxxx family (specifically only for the AT32UC3B0256 at the moment). arch/hc This directory is dedicated to ports to the Freescale HC family. arch/arm/include/m9s12 and arch/arm/src/m9s12 These directories provide support for the Freescale mc9s12x family. STATUS: Fragments of this port were first released in nuttx-5.0 and the port was "code-complete" as nuttx-5.18. However, the final verification effort has been stalled because of higher priority tasks. arch/m68322 A work in progress. STATUS: Stalled for the time being. arch/mips This directory is dedicated to ports to the MIPS family. arch/mips/include/mips32 and arch/mips/src/mips32 Common support for all MIPS32 architectures arch/mips/include/pic32mx and arch/mips/src/pic32mx Support for all MicroChip PIC32MX architectures arch/rgmp RGMP stands for RTOS and GPOS on Multi-Processor. RGMP is a project for running GPOS and RTOS simultaneously on multi-processor platforms. You can port your favorite RTOS to RGMP together with an unmodified Linux to form a hybrid operating system. This makes your application able to use both RTOS and GPOS features. See http://rgmp.sourceforge.net/wiki/index.php/Main_Page for further information about RGMP. arch/sh - SuperH and related Hitachi/Renesas microcontrollers arch/sh/include and arch/sh/src/common Common SuperH logic. arch/sh/include/shs and arch/sh/src/sh1 Support for the SH-1 processor. arch/8051 - 8051/52 microcontrollers 8051 Microcontroller. This port is not quite ready for prime time. arch/x86 - Intel x86 architectures This directory holds related, 32- and 64-bit architectures from Intel. At present, this includes the following subdirectories: arch/x86/include and arch/x86/src/common Common x86 logic. arch/x86/include/i486 and arch/x86/src/i486 These directories hold definitions and logic appropriate for any instantiation of the 32-bit i486 architecture. arch/x86/include/qemu and arch/x86/src/qemu This is the implementation of NuttX on the QEMU x86 simulation. arch/z16 - ZiLOG 16-bit processors This directory holds related, 16-bit architectures from ZiLOG. At present, this includes the following subdirectories: arch/z16/include and arch/z16/src/common Common microcontroller logic. arch/z16/include/z16f and arch/z16/src/z16f ZiLOG z16f Microcontroller. STATUS: Released in nuttx-0.3.7. Fully functional other than issues addressed in ${TOPDIR}/TODO. arch/z80 - ZiLOG 8-bit microcontrollers This directory holds related, 8-bit architectures from ZiLOG. At present, this includes the following subdirectories: arch/z80/include and arch/z80/src/common Common microcontroller logic. arch/z80/include/z80 and arch/z80/src/z80 Classic ZiLOG z80 Microcontroller. STATUS: Functional with no known defects. There are still several OS features that have not yet been tested (e.g., networking). arch/z80/include/z8 and arch/z80/src/z8 ZiLOG Z8Encore! Microcontroller arch/z80/include/ez80 and arch/z80/src/ez80 ZiLOG ez80 Acclaim! Microcontroller