README
^^^^^^
This is the README file for the port of NuttX to the Neuros OSD.
CONTENTS
^^^^^^^^
- Dev vs. Production Neuros OSD v1.0 boards
- Development Environment
- GNU Toolchain Options
- IDEs
- NuttX buildroot Toolchain
- ARM/DM320-specific Configuration Options
- Configurations
- Configuration Options
- Issues
Dev vs. Production Neuros OSD v1.0 boards
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This port supports both the original Neuros OSD v1.0 Dev Board.
This port has recently been extended to V1.0 Production board (and
that is now the default configuration). References:
http://www.neurostechnology.com/neuros-developer-community
http://wiki.neurostechnology.com/index.php/OSD_1.0_Developer_Home
http://wiki.neurostechnology.com/index.php/DM320_Platform_development
There are some differences between the Dev Board and the currently
available commercial v1.0 Boards, most notably in the amount of memory:
8Mb FLASH and 32Mb RAM vs. 16Mb and 64Mb as in the production board.
See the following for more information:
http://wiki.neurostechnology.com/index.php/OSD_Developer_Board_v1
NuttX operates on the ARM9EJS of this dual core processor. The DSP
is available and unused.
STATUS: This port is code complete, verified, and included in the
NuttX 0.2.1 release.
Development Environment
^^^^^^^^^^^^^^^^^^^^^^^
Either Linux or Cygwin on Windows can be used for the development environment.
The source has been built only using the GNU toolchain (see below). Other
toolchains will likely cause problems.
GNU Toolchain Options
^^^^^^^^^^^^^^^^^^^^^
The NuttX make system has been modified to support the following different
toolchain options.
1. The NuttX buildroot Toolchain (see below), or
2. Any generic arm-none-eabi GNU toolchain.
All testing has been conducted using the NuttX buildroot toolchain. To use
a different toolchain, you simply need to modify the configuration. As an
example:
CONFIG_ARM_TOOLCHAIN_GNU_EABI : Generic arm-none-eabi toolchain
Generic arm-none-eabi GNU Toolchain
-----------------------------------
There are a number of toolchain projects providing support for ARMv4/v5
class processors, including:
GCC ARM Embedded
https://developer.arm.com/open-source/gnu-toolchain/gnu-rm
Others exist for various Linux distributions, MacPorts, etc. Any version
based on GCC 4.6.3 or later should work.
IDEs
^^^^
NuttX is built using command-line make. It can be used with an IDE, but some
effort will be required to create the project.
Makefile Build
--------------
Under Eclipse, it is pretty easy to set up an "empty makefile project" and
simply use the NuttX makefile to build the system. That is almost for free
under Linux. Under Windows, you will need to set up the "Cygwin GCC" empty
makefile project in order to work with Windows (Google for "Eclipse Cygwin" -
there is a lot of help on the internet).
Native Build
------------
Here are a few tips before you start that effort:
1) Select the toolchain that you will be using in your .config file
2) Start the NuttX build at least one time from the Cygwin command line
before trying to create your project. This is necessary to create
certain auto-generated files and directories that will be needed.
3) Set up include paths: You will need include/, arch/arm/src/dm320,
arch/arm/src/common, arch/arm/src/arm, and sched/.
4) All assembly files need to have the definition option -D __ASSEMBLY__
on the command line.
Startup files will probably cause you some headaches. The NuttX startup file
is arch/arm/src/arm/up_head.S. You may have to build the NuttX
one time from the Cygwin command line in order to obtain the pre-built
startup object needed by the IDE.
NuttX buildroot Toolchain
^^^^^^^^^^^^^^^^^^^^^^^^^
A GNU GCC-based toolchain is assumed. The PATH environment variable should
be modified to point to the correct path to the ARM926 GCC toolchain (if
different from the default).
If you have no ARM toolchain, one can be downloaded from the NuttX
Bitbucket download site (https://bitbucket.org/nuttx/buildroot/downloads/).
1. You must have already configured NuttX in <some-dir>nuttx.
tools/configure.sh ntosd-dm320:<sub-dir>
2. Download the latest buildroot package into <some-dir>
3. unpack
4. cd <some-dir>/buildroot
5. cp boards/arm-defconfig .config OR
cp boards/arm926t_defconfig-4.2.4 .config
6. make oldconfig
7. make
8. Make sure that the PATH variable includes the path to the newly built
binaries.
ARM/DM320-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_ARM926EJS=y
CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory
CONFIG_ARCH_CHIP=dm320
CONFIG_ARCH_CHIP_name - For use in C code
CONFIG_ARCH_CHIP_DM320
CONFIG_ARCH_BOARD - Identifies the boards/ subdirectory and
hence, the board that supports the particular chip or SoC.
CONFIG_ARCH_BOARD=ntosd-dm320
CONFIG_ARCH_BOARD_name - For use in C code
CONFIG_ARCH_BOARD_NTOSD_DM320 (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
DM320 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
DM320 USB Configuration
CONFIG_DM320_GIO_USBATTACH
GIO that detects USB attach/detach events
CONFIG_DM320_GIO_USBDPPULLUP
GIO
CONFIG_DMA320_USBDEV_DMA
Enable DM320-specific DMA support
CONFIG_DM320_GIO_USBATTACH=6
Configurations
^^^^^^^^^^^^^^
Common Configuration Notes
--------------------------
1. Each Neuros OSD configuration is maintained in a sub-directory and
can be selected as follow:
tools/configure.sh ntosd-dm320:<subdir>
Where <subdir> 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
see additional README.txt files in the NuttX tools repository.
b. Execute 'make menuconfig' in nuttx/ in order to start the
reconfiguration process.
3. By default, all configurations assume the ARM EABI toolchain under
Linux. This is easily reconfigured:
CONFIG_HOST_LINUX=y
CONFIG_ARM_TOOLCHAIN_GNU_EABI=y
Configuration Sub-Directories
-----------------------------
nettest
This alternative configuration directory may be used to
enable networking using the OSDs DM9000A Ethernet interface.
It uses examples/nettest to exercise the TCP/IP network.
nsh
Configures the NuttShell (nsh) located at examples/nsh. The
Configuration enables both the serial and telnetd NSH interfaces.
poll
This configuration exercises the poll()/select() text at
examples/poll
udp
This alternative configuration directory is similar to nettest
except that it uses examples/udp to exercise UDP.
webserver
This configuration file demonstrates the tiny webserver
at examples/webserver.
Configuration Options
^^^^^^^^^^^^^^^^^^^^^
In additional to the common configuration options listed in the
file boards/README.txt, there are other configuration options
specific to the DM320:
CONFIG_ARCH - identifies the arch subdirectory and, hence, the
processor architecture.
CONFIG_ARCH_name - for use in C code. This identifies the
particular chip or SoC that the architecture is implemented
in.
CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory
CONFIG_ARCH_CHIP_name - For use in C code
CONFIG_ARCH_BOARD - identifies the boards/ subdirectory and, hence,
the board that supports the particular chip or SoC.
CONFIG_ENDIAN_BIG - define if big endian (default is little endian)
CONFIG_ARCH_BOARD_name - for use in C code
CONFIG_BOARD_LOOPSPERMSEC - for delay loops
CONFIG_ARCH_LEDS - Use LEDs to show state.
CONFIG_RAM_SIZE - Describes the internal DRAM.
CONFIG_RAM_START - The start address of internal DRAM
CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions
DM320 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
DM320 USB Configuration
CONFIG_DM320_GIO_USBATTACH
GIO that detects USB attach/detach events
CONFIG_DM320_GIO_USBDPPULLUP
GIO connected to D+. Support software connect/disconnect.
CONFIG_DMA320_USBDEV_DMA
Enable DM320-specific DMA support
Neuros OSD Configuration Options
CONFIG_ARCH_NTOSD_DEVBOARD - Selects the old NTOSD development board.
The default is the production OSD board which differs in
several ways.
Issues
^^^^^^
Title: DEBUG ISSUES
Description: config/ntos-dm320: It seems that when a lot of debug statements
are added, the system no longer boots. This is suspected to be
a stack problem: Making the stack bigger or removing arrays on
the stack seems to fix the problem (might also be the
bootloader overwriting memory)
Status: Open
Priority: Medium
Title: USB DEVICE DRIVER UNTESTED
Description: A USB device controller driver was added but has never been tested.
Status: Open
Priority: Medium
Title: FRAMEBUFFER DRIVER UNTESTED
Description: A framebuffer "driver" was added, however, it remains untested.
Status: Open
Priority: Medium
Title: VIDEO ENCODER DRIVER
Description: In order to use the framebuffer "driver" additional video encoder
logic is required to setup composite video output or to interface
with an LCD.
Status: Open
Priority: Medium (high if you need to use the framebuffer driver)
