64658b5d2d
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1782 42af7a65-404d-4744-a932-0658087f49c3
176 lines
5.7 KiB
Plaintext
176 lines
5.7 KiB
Plaintext
README
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^^^^^^
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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).
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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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1. You must have already configured Nuttx in <some-dir>/nuttx.
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cd tools
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./configure.sh eagle100/<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/cortexm3-defconfig-4.3.3 .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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Ethernet-Bootloader
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^^^^^^^^^^^^^^^^^^^
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Here are some notes about using the Luminary Ethernet boot-loader built
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into the Eagle-100 board.
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- The board has no fixed IP address but uses DHCP to get an address.
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I use a D-link router; I can use a web browser to surf to the D-link
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web page to get the address assigned by
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- Then you can use this IP address in your browser to surf to the Eagle-100
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board. It presents several interesting pages -- the most important is
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the page called "Firmware Update". That page includes instructions on
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how to download code to the Eagle-100.
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- You will need the "LM Flash Programmer application". You can get that
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program from the Luminary web site. There is a link on the LM3S6918 page.
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- Is there any documentation for using the bootloader? Yes and No: There
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is an application note covering the bootloader on the Luminary site, but
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it is not very informative.
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- Are there any special things I have to do in my code, other than setting
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the origin to 0x0000:2000 (APP_START_ADDRESS)? No. The bootload assumes
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that you have a vector table at that address . The bootloader does the
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following each time it boots (after you have downloaded the first valid
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application):
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o The bootloader sets the vector table register to the APP_START_ADDRESS,
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o It sets the stack pointer to the address at APP_START_ADDRESS, and then
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o Jumps to the address at APP_START_ADDRESS+4.
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- You can force the bootloader to skip starting the application and stay
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in the update mode. You will need to do this in order to download a new
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application. You force the update mode by holding the user button on the
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Eagle-100 board while resetting the board. The user button is GPIOA, pin 6
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(call FORCED_UPDATE_PIN in the bootloader code).
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Eagle100-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_name - For use in C code:
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CONFIG_ARCH_ARM=y
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CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory
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CONFIG_ARCH_CHIP=lm3s
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CONFIG_ARCH_CHIP_name - For use in C code to identify the exact
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chip:
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CONFIG_ARCH_CHIP_LM3S6918
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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=eagle100 (for the MicroMint Eagle-100 development board)
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CONFIG_ARCH_BOARD_name - For use in C code
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CONFIG_ARCH_BOARD_EAGLE100
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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 - Describes the installed DRAM (SRAM in this case):
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CONFIG_DRAM_SIZE=0x00010000 (64Kb)
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CONFIG_DRAM_START - The start address of installed DRAM
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CONFIG_DRAM_START=0x20000000
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CONFIG_DRAM_END - Last address+1 of installed RAM
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CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
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CONFIG_ARCH_IRQPRIO - The LM3S6918 supports interrupt prioritization
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CONFIG_ARCH_IRQPRIO=y
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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_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 - Configure to use the MicroMint Eagle-100
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Ethernet bootloader.
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CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to board architecture.
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LM3S6818 specific device driver settings
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CONFIG_UARTn_SERIAL_CONSOLE - selects the UARTn for the
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console and ttys0 (default is the UART0).
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CONFIG_UARTn_RXBUFSIZE - Characters are buffered as received.
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This specific the size of the receive buffer
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CONFIG_UARTn_TXBUFSIZE - Characters are buffered before
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being sent. This specific the size of the transmit buffer
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CONFIG_UARTn_BAUD - The configure BAUD of the UART. Must be
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CONFIG_UARTn_BITS - The number of bits. Must be either 7 or 8.
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CONFIG_UARTn_PARTIY - 0=no parity, 1=odd parity, 2=even parity
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CONFIG_UARTn_2STOP - Two stop bits
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Configurations
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^^^^^^^^^^^^^^
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Each Eagle-100 configuration is maintained in a sudirectory and
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can be selected as follow:
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cd tools
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./configure.sh eagle100/<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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^^^^^^
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This configuration directory, performs a simple OS test using
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examples/ostest.
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