README ^^^^^^ Toolchain ^^^^^^^^^ A GNU GCC-based toolchain is assumed. The files */setenv.sh should be modified to point to the correct path to the ARM920T GCC toolchain (if different from the default). If you have no ARM toolchain, one can be downloaded from the NuttX SourceForge download site (https://sourceforge.net/projects/nuttx/files/buildroot/). 1. You must have already configured Nuttx in nuttx. cd tools ./configure.sh mx1ads/ 2. Download the latest buildroot package into 3. unpack 4. cd /buildroot 5. cp configs/arm920t-defconfig-4.2.4 .config 6. make oldconfig 7. make 8. Edit setenv.h so that the PATH variable includes the path to the newly built binaries. Issues ^^^^^^ Title: PORT IS INCOMPLETE Description: The basic port of the i.MX1 architecture was never finished. The port is incomplete (as of this writing, is still lacks a timer, interrupt decoding, USB, network) and untested. Status: Open Priority: Medium (high if you need i.MX1/L support) Title: SPI METHODS ARE NOT THREAD SAFE Description: SPI methods are not thread safe. Needs a semaphore to protect from re-entrancy. Status: Open Priority: Medium -- Will be very high if you do SPI access from multiple threads. ARM/i.MX1-specific Configuration Options ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ CONFIG_ARCH - Identifies the arch/ subdirectory. This should be set to: CONFIG_ARCH=arm CONFIG_ARCH_family - For use in C code: CONFIG_ARCH_ARM=y CONFIG_ARCH_architecture - For use in C code: CONFIG_ARCH_ARM920T=y CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory CONFIG_ARCH_CHIP=imx CONFIG_ARCH_CHIP_name - For use in C code. Could be line _IMX1, _IMXL, _IMX21, _IMX27, _IMX31, etc. (not all of which are supported). CONFIG_ARCH_CHIP_IMX1 CONFIG_ARCH_BOARD - Identifies the configs subdirectory and hence, the board that supports the particular chip or SoC. CONFIG_ARCH_BOARD=mx1ads (for the Freescale MX1ADS evaluation board) CONFIG_ARCH_BOARD_name - For use in C code CONFIG_ARCH_BOARD_MX1ADS (for the Spectrum Digital C5471 EVM) CONFIG_ARCH_LOOPSPERMSEC - Must be calibrated for correct operation of delay loops CONFIG_ENDIAN_BIG - define if big endian (default is little endian) CONFIG_RAM_SIZE - Describes the installed DRAM. CONFIG_RAM_START - The start address of installed DRAM CONFIG_RAM_VSTART - The startaddress of DRAM (virtual) CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that have LEDs CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt stack. If defined, this symbol is the size of the interrupt stack in bytes. If not defined, the user task stacks will be used during interrupt handling. CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions CONFIG_ARCH_CALIBRATION - Enables some build in instrumentation that cause a 100 second delay during boot-up. This 100 second delay serves no purpose other than it allows you to calibratre CONFIG_ARCH_LOOPSPERMSEC. You simply use a stop watch to measure the 100 second delay then adjust CONFIG_ARCH_LOOPSPERMSEC until the delay actually is 100 seconds. IMX specific device driver settings CONFIG_UARTn_SERIAL_CONSOLE - selects the UARTn for the console and ttys0 (default is the UART0). CONFIG_UARTn_RXBUFSIZE - Characters are buffered as received. This specific the size of the receive buffer CONFIG_UARTn_TXBUFSIZE - Characters are buffered before being sent. This specific the size of the transmit buffer CONFIG_UARTn_BAUD - The configure BAUD of the UART. Must be CONFIG_UARTn_BITS - The number of bits. Must be either 7 or 8. CONFIG_UARTn_PARTIY - 0=no parity, 1=odd parity, 2=even parity CONFIG_UARTn_2STOP - Two stop bits IMX USB Configuration CONFIG_IMX_GIO_USBATTACH GIO that detects USB attach/detach events CONFIG_IMX_GIO_USBDPPULLUP GIO CONFIG_DMA320_USBDEV_DMA Enable IMX-specific DMA support CONFIG_IMX_GIO_USBATTACH=6 Configurations ^^^^^^^^^^^^^^ Common Configuration Notes -------------------------- 1. Each MX1ADS configuration is maintained in a sub-directory and can be selected as follow: cd tools ./configure.sh imxads/ cd - . ./setenv.sh Where is one of the configuration sub-directories described in the following paragraph. 2. These configurations use the mconf-based configuration tool. To change a configurations using that tool, you should: a. Build and install the kconfig-mconf tool. See nuttx/README.txt and misc/tools/ b. Execute 'make menuconfig' in nuttx/ in order to start the reconfiguration process. 3. By default, all configurations assume that you are building under Linux (should work under Windows with Cygwin as well). This is is easily reconfigured: CONFIG_HOST_LINUX=y Configuration Sub-Directories ----------------------------- Where is one of the following: ostest This configuration directory, performs a simple OS test using examples/ostest.