README update + lpc313x now links to ISRAM addresses
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2471 42af7a65-404d-4744-a932-0658087f49c3
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configs/ea3131/README.txt
Executable file
295
configs/ea3131/README.txt
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README
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^^^^^^
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This README file discusses the port of NuttX to the Embedded Artists
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EA3131 board.
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Contents
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^^^^^^^^
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o Development Environment
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o GNU Toolchain Options
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o IDEs
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o NuttX buildroot Toolchain
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o Boot Sequence
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o ARM/EA3131-specific Configuration Options
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o Configurations
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Development Environment
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^^^^^^^^^^^^^^^^^^^^^^^
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Either Linux or Cygwin on Windows can be used for the development environment.
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The source has been built only using the GNU toolchain (see below). Other
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toolchains will likely cause problems.
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GNU Toolchain Options
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^^^^^^^^^^^^^^^^^^^^^
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The NuttX make system has been modified to support the following different
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toolchain options.
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1. The CodeSourcery GNU toolchain,
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2. The devkitARM GNU toolchain,
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3. Raisonance GNU toolchain, or
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4. The NuttX buildroot Toolchain (see below).
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All testing has been conducted using the NuttX buildroot toolchain. However,
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the make system is setup to default to use the devkitARM toolchain. To use
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the CodeSourcery, devkitARM or Raisonance GNU toolchain, you simply need to
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add one of the following configuration options to your .config (or defconfig)
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file:
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CONFIG_LPC313X_CODESOURCERYW=y : CodeSourcery under Windows
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CONFIG_LPC313X_CODESOURCERYL=y : CodeSourcery under Linux
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CONFIG_LPC313X_DEVKITARM=y : devkitARM under Windows
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CONFIG_LPC313X_RAISONANCE=y : Raisonance RIDE7 under Windows
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CONFIG_LPC313X_BUILDROOT=y : NuttX buildroot under Linux or Cygwin (default)
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If you are not using CONFIG_LPC313X_BUILDROOT, then you may also have to modify
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the PATH in the setenv.h file if your make cannot find the tools.
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NOTE: the CodeSourcery (for Windows), devkitARM, and Raisonance toolchains are
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Windows native toolchains. The CodeSourcey (for Linux) and NuttX buildroot
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toolchains are Cygwin and/or Linux native toolchains. There are several limitations
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to using a Windows based toolchain in a Cygwin environment. The three biggest are:
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1. The Windows toolchain cannot follow Cygwin paths. Path conversions are
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performed automatically in the Cygwin makefiles using the 'cygpath' utility
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but you might easily find some new path problems. If so, check out 'cygpath -w'
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2. Windows toolchains cannot follow Cygwin symbolic links. Many symbolic links
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are used in Nuttx (e.g., include/arch). The make system works around these
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problems for the Windows tools by copying directories instead of linking them.
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But this can also cause some confusion for you: For example, you may edit
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a file in a "linked" directory and find that your changes had not effect.
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That is because you are building the copy of the file in the "fake" symbolic
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directory. If you use a Windows toolchain, you should get in the habit of
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making like this:
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make clean_context all
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An alias in your .bashrc file might make that less painful.
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3. Dependencies are not made when using Windows versions of the GCC. This is
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because the dependencies are generated using Windows pathes which do not
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work with the Cygwin make.
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Support has been added for making dependencies with the windows-native toolchains.
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That support can be enabled by modifying your Make.defs file as follows:
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- MKDEP = $(TOPDIR)/tools/mknulldeps.sh
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+ MKDEP = $(TOPDIR)/tools/mkdeps.sh --winpaths "$(TOPDIR)"
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If you have problems with the dependency build (for example, if you are not
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building on C:), then you may need to modify tools/mkdeps.sh
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NOTE 1: The CodeSourcery toolchain (2009q1) does not work with default optimization
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level of -Os (See Make.defs). It will work with -O0, -O1, or -O2, but not with
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-Os.
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NOTE 2: The devkitARM toolchain includes a version of MSYS make. Make sure that
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the paths to Cygwin's /bin and /usr/bin directories appear BEFORE the devkitARM
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path or will get the wrong version of make.
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IDEs
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^^^^
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NuttX is built using command-line make. It can be used with an IDE, but some
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effort will be required to create the project (There is a simple RIDE project
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in the RIDE subdirectory). Here are a few tip before you start that effort:
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1) Select the toolchain that you will be using in your .config file
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2) Start the NuttX build at least one time from the Cygwin command line
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before trying to create your project. This is necessary to create
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certain auto-generated files and directories that will be needed.
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3) Set up include pathes: You will need include/, arch/arm/src/lpc313x,
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arch/arm/src/common, arch/arm/src/cortexm3, and sched/.
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4) All assembly files need to have the definition option -D __ASSEMBLY__
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on the command line.
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Startup files will probably cause you some headaches. The NuttX startup file
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is arch/arm/src/lpc313x/lpc313x_vectors.S. With RIDE, I have to build NuttX
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one time from the Cygwin command line in order to obtain the pre-built
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startup object needed by RIDE.
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NuttX buildroot Toolchain
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^^^^^^^^^^^^^^^^^^^^^^^^^
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A GNU GCC-based toolchain is assumed. The files */setenv.sh should
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be modified to point to the correct path to the Cortex-M3 GCC toolchain (if
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different from the default in your PATH variable).
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If you have no Cortex-M3 toolchain, one can be downloaded from the NuttX
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SourceForge download site (https://sourceforge.net/project/showfiles.php?group_id=189573).
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This GNU toolchain builds and executes in the Linux or Cygwin environment.
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1. You must have already configured Nuttx in <some-dir>/nuttx.
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cd tools
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./configure.sh ea3131/<sub-dir>
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2. Download the latest buildroot package into <some-dir>
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3. unpack the buildroot tarball. The resulting directory may
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have versioning information on it like buildroot-x.y.z. If so,
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rename <some-dir>/buildroot-x.y.z to <some-dir>/buildroot.
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4. cd <some-dir>/buildroot
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5. cp configs/arm926t-defconfig-4.2.4 .config
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6. make oldconfig
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7. make
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8. Edit setenv.h, if necessary, so that the PATH variable includes
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the path to the newly built binaries.
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See the file configs/README.txt in the buildroot source tree. That has more
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detailed PLUS some special instructions that you will need to follow if you are
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building a Cortex-M3 toolchain for Cygwin under Windows.
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Boot Sequence
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^^^^^^^^^^^^^
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LPC313x has on chip bootrom which loads properly formatted images from multiple
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sources into SRAM. These sources include including SPI Flash, NOR Flash, UART,
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USB, SD Card, and NAND Flash.
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In all configurations, NuttX is loaded directly into ISRAM. NuttX is linked
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to execute from ISRAM, regardless of the boot source.
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ARM/EA3131-specific Configuration Options
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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CONFIG_ARCH - Identifies the arch/ subdirectory. This should
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be set to:
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CONFIG_ARCH=arm
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CONFIG_ARCH_family - For use in C code:
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CONFIG_ARCH_ARM=y
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CONFIG_ARCH_architecture - For use in C code:
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CONFIG_ARCH_ARM926EJS=y
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CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory
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CONFIG_ARCH_CHIP=lpc313x
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CONFIG_ARCH_CHIP_name - For use in C code
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CONFIG_ARCH_CHIP_LPC3131
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CONFIG_ARCH_BOARD - Identifies the configs subdirectory and
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hence, the board that supports the particular chip or SoC.
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CONFIG_ARCH_BOARD=ea3131
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CONFIG_ARCH_BOARD_name - For use in C code
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CONFIG_ARCH_BOARD_EA3131
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CONFIG_ARCH_LOOPSPERMSEC - Must be calibrated for correct operation
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of delay loops
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CONFIG_ENDIAN_BIG - define if big endian (default is little
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endian)
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CONFIG_DRAM_SIZE - For most ARM9 architectures, this describes the
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size of installed DRAM. For the LPC313X, it is used only to
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deterimine how to map the executable regions. It is SDRAM size
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only if you are executing out of the external SDRAM; or it could
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be NOR FLASH size, external SRAM size, or internal SRAM size.
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CONFIG_DRAM_START - The start address of installed DRAM (physical)
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CONFIG_DRAM_VSTART - The startaddress of DRAM (virtual)
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CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that
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have LEDs
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CONFIG_ARCH_IRQPRIO - The LPC313x supports interrupt prioritization
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CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
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stack. If defined, this symbol is the size of the interrupt
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stack in bytes. If not defined, the user task stacks will be
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used during interrupt handling.
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CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions
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CONFIG_ARCH_BOOTLOADER - Set if you are using a bootloader.
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CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to board architecture.
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CONFIG_ARCH_BUTTONS - Enable support for buttons. Unique to board architecture.
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CONFIG_ARCH_CALIBRATION - Enables some build in instrumentation that
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cause a 100 second delay during boot-up. This 100 second delay
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serves no purpose other than it allows you to calibratre
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CONFIG_ARCH_LOOPSPERMSEC. You simply use a stop watch to measure
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the 100 second delay then adjust CONFIG_ARCH_LOOPSPERMSEC until
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the delay actually is 100 seconds.
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CONFIG_ARCH_DMA - Support DMA initialization
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CONFIG_ARCH_LOWVECTORS - define if vectors reside at address 0x0000:00000
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Undefine if vectors reside at address 0xffff:0000
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CONFIG_ARCH_ROMPGTABLE - A pre-initialized, read-only page table is available.
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If defined, then board-specific logic must also define PGTABLE_BASE_PADDR,
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PGTABLE_BASE_VADDR, and all memory section mapping in a file named
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board_memorymap.h.
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Individual subsystems can be enabled:
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CONFIG_LPC313X_MCI, CONFIG_LPC313X_SPI, CONFIG_LPC313X_UART
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xernal memory available on the board (see also CONFIG_MM_REGIONS)
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CONFIG_LPC313X_EXTSRAM0 - Select if external SRAM0 is present
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CONFIG_LPC313X_EXTSRAM0HEAP - Select if external SRAM0 should be
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configured as part of the NuttX heap.
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CONFIG_LPC313X_EXTSRAM0SIZE - Size (in bytes) of the installed
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external SRAM0 memory
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CONFIG_LPC313X_EXTSRAM1 - Select if external SRAM1 is present
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CONFIG_LPC313X_EXTSRAM1HEAP - Select if external SRAM1 should be
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configured as part of the NuttX heap.
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CONFIG_LPC313X_EXTSRAM1SIZE - Size (in bytes) of the installed
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external SRAM1 memory
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CONFIG_LPC313X_EXTSDRAM - Select if external SDRAM is present
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CONFIG_LPC313X_EXTSDRAMHEAP - Select if external SDRAM should be
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configured as part of the NuttX heap.
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CONFIG_LPC313X_EXTSDRAMSIZE - Size (in bytes) of the installed
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external SDRAM memory
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CONFIG_LPC313X_EXTNAND - Select if external NAND is present
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CONFIG_LPC313X_EXTSDRAMSIZE - Size (in bytes) of the installed
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external NAND memory
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LPC313X specific device driver settings
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CONFIG_UART_SERIAL_CONSOLE - selects the UART for the
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console and ttys0
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CONFIG_UART_RXBUFSIZE - Characters are buffered as received.
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This specific the size of the receive buffer
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CONFIG_UART_TXBUFSIZE - Characters are buffered before
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being sent. This specific the size of the transmit buffer
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CONFIG_UART_BAUD - The configure BAUD of the UART. Must be
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CONFIG_UART_BITS - The number of bits. Must be either 7 or 8.
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CONFIG_UART_PARTIY - 0=no parity, 1=odd parity, 2=even parity
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CONFIG_UART_2STOP - Two stop bits
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Configurations
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^^^^^^^^^^^^^^
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Each EA3131 configuration is maintained in a sudirectory and can be
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selected as follow:
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cd tools
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./configure.sh ea3131/<subdir>
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cd -
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. ./setenv.sh
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Where <subdir> is one of the following:
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ostest:
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This configuration directory, performs a simple OS test using
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examples/ostest. By default, this project assumes that you are
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using the DFU bootloader.
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@ -33,14 +33,13 @@
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*
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****************************************************************************/
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/* The EA3131 has 512Kb of FLASH beginning at virtual address 0x0800:0000.
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* The LPC3131 has 192Kb of SRAM beginning at virtual address 0x1102:8000.
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/* The LPC3131 has 192Kb of ISRAM beginning at virtual address 0x1102:8000.
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* All program segments are configured to execute from ISRAM.
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*/
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MEMORY
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{
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flash (rx) : ORIGIN = 0x08000000, LENGTH = 512K
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sram (rwx) : ORIGIN = 0x11028000, LENGTH = 192K
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isram (rwx) : ORIGIN = 0x11028000, LENGTH = 192K
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}
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OUTPUT_ARCH(arm)
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@ -61,7 +60,7 @@ SECTIONS
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*(.gcc_except_table)
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*(.gnu.linkonce.r.*)
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_etext = ABSOLUTE(.);
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} > flash
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} > isram
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_eronly = ABSOLUTE(.);
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@ -71,17 +70,17 @@ SECTIONS
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*(.gnu.linkonce.d.*)
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CONSTRUCTORS
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_edata = ABSOLUTE(.);
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} > sram AT > flash
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} > isram AT > isram
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.ARM.extab : {
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*(.ARM.extab*)
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} >sram
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} >isram
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.ARM.exidx : {
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__exidx_start = ABSOLUTE(.);
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*(.ARM.exidx*)
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__exidx_end = ABSOLUTE(.);
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} > sram
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} > isram
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.bss : {
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_sbss = ABSOLUTE(.);
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@ -89,7 +88,7 @@ SECTIONS
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*(.gnu.linkonce.b.*)
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*(COMMON)
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_ebss = ABSOLUTE(.);
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} > sram
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} > isram
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/* Stabs debugging sections. */
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.stab 0 : { *(.stab) }
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.stabstr 0 : { *(.stabstr) }
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