README
^^^^^^

Toolchain
^^^^^^^^^

A GNU GCC-based toolchain is assumed. The PATH environment variable should
be modified to point to the correct path to the SH 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 nuttx.

tools/configure.sh c5471evm/

2. Download the latest buildroot package into

3. unpack

4. cd /buildroot

5. cp configs/arm-defconfig .config

6. make oldconfig

7. make

8. Make sure that the PATH variable includes the path to the newly built
binaries.

Issues
^^^^^^

Title: UART RECONFIGURATION
Description: UART re-configuration is untested and conditionally compiled out.
Status: Open
Priority: Medium. ttyS1 is not configured, but not used; ttyS0 is configured
by the bootloader

ARM/C5471-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_ARM7TDMI=y

CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory

CONFIG_ARCH_CHIP=c5471

CONFIG_ARCH_CHIP_name - For use in C code

CONFIG_ARCH_CHIP_C5471

CONFIG_ARCH_BOARD - Identifies the configs subdirectory and
hence, the board that supports the particular chip or SoC.

CONFIG_ARCH_BOARD=c5471evm (for the Spectrum Digital C5471 EVM)

CONFIG_ARCH_BOARD_name - For use in C code

CONFIG_ARCH_BOARD_C5471EVM (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_ROM_VECTORS - should be defined for the C5471 because the
interrupt vectors are in ROM

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

C5471 specific device driver settings

CONFIG_SERIAL_IRDA_CONSOLE - selects the IRDA UART for the
console ant ttys0 (default is the modem UART).
CONFIG_UART_*_HWFLOWCONTROL - enables hardware flow control
CONFIG_UART_*_RXBUFSIZE - Characters are buffered as received.
This specific the size of the receive buffer
CONFIG_UART_*_TXBUFSIZE - Characters are buffered before
being sent. This specific the size of the transmit buffer
CONFIG_UART_*_BAUD - The configure BAUD of the UART. Must be
CONFIG_UART_*_BITS - The number of bits. Must be either 7 or 8.
CONFIG_UART_*_PARTIY - 0=no parity, 1=odd parity, 2=even parity
CONFIG_UART_*_2STOP - Two stop bits

C5471 Ethernet Driver settings

CONFIG_C5471_NET_STATS
CONFIG_C5471_PHY_AC101L or C5471_PHY_LU3X31T_T64
CONFIG_C5471_AUTONEGOTIATION
CONFIG_C5471_BASET100
CONFIG_C5471_BASET10

Configurations
^^^^^^^^^^^^^^

Common Configuration Notes
--------------------------

1. Each C5471 configuration is maintained in a sub-directory and
can be selected as follow:

tools/configure.sh c5471evm/

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
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 NuttX Buildroot toolchain
under Linux (should work under Windows with Cygwin as well). This
is easily reconfigured:

CONFIG_HOST_LINUX=y
CONFIG_ARM_TOOLCHAIN_BUILDROOT=y

Configuration Sub-Directories
-----------------------------

nettest

This configuration enables networking using the c5471's built-in Ethernet
interface. It uses examples/nettest to exercise the TCP/IP network.

nsh

This configuration file builds NSH (examples/nsh) using the TELNET server
front end

httpd

This configuration uses the tiny webserver for uIP.