56529d2944
- migrated /README are removed from /boards - there are a lot of READMEs that should be further converted to rst. At the moment they are moved to Documentation/platforms and included in rst files
489 lines
18 KiB
Plaintext
489 lines
18 KiB
Plaintext
README.txt
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==========
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The MakerLisp machine is a portable, modular computer system, designed to
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recapture the feel of classic computing, with modern hardware.
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The machine centers on a 2" x 3.5" business card-sized CPU, which can be used
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stand-alone, or plugged in to a 2" x 8" main board, for expansion into a full
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computer system. A laser-cut wood enclosure holds a small keyboard, an LCD
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monitor, the circuit boards, and a prototyping area with a breadboard for
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electronics experimentation and development.
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The CPU is a Zilog eZ80 running at 50 MHz, with up to 16 Mb of zero-wait state
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RAM. A VGA display adapter provides an IBM PC-like color text-mode display. A
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USB Host Controller supports a USB keyboard and other USB communications.
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Data storage and interchange is accomplished by a micro-SD card supporting the
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FAT file system. All four of these circuit boards (shown on the web site's cover
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page) are new MakerLisp products, and will be available as part of the first
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product offering
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Contents
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========
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o ZDS-II Compiler Versions
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o Serial Console
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- UARTs
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- Serial Keyboard and VGA Display
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o LEDs and Buttons
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- LEDs
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- Buttons
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o Configurations
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- Common Configuration Notes
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- Configuration Subdirectories
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ZDS-II Compiler Versions
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========================
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Version 5.3.3
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As of this writing, this is the latest version available. This is the
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default configured for all ez80 boards.
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Version 5.3.0
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I verified compilation using 5.3.0 on June 2, 2019. To use this version,
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I had to make spurious modification to the implementation of gmtimer() to
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work around an internal compiler error. I have still not verified that
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are no errors in the compiled code.
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Other Versions
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If you use any version of ZDS-II other than 5.3.0 or if you install ZDS-II
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at any location other than the default location, you will have to modify
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three files: (1) arch/arm/z80/src/ez80/Kconfig, (2)
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boards/z80/ez80/makerlisp/scripts/Make.defs and, perhaps, (3)
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arch/z80/src/ez80/Toolchain.defs.
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Serial Console
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==============
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There are two options for a serial console: (1) A UART connected to a
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terminal program or (2) the MakerLisp Serial Keyboard and VGA display.
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UARTs
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-----
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The eZ80 has two UART peripherals:
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UART 0: All of Port D pins can support UART0 functions when configured
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for the alternate function 7. For typical configurations only RXD and TXD
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need be configured.
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eZ80 PIN BOARD SIGNAL CN1 ACCESS
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=======================================
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PD0/TXD0/IR_IXD CN1_TX0 Pin 61
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PD1/RXD0/IR_RXD CN1_RX0 Pin 59
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PD2/RTS0 CN1_RTS0 Pin 63
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PD3/CTS0 CN1_CTS0 Pin 65
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PD4/DTR0 CN1_DTR0 Pin 67
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PD5/DSR0 CN1_DSR0 Pin 69
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PD6/DCD0 CN1_DCD0 Pin 71
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PD7/RIO0 CN1_RI0 Pin 73
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UART0 (as well as I2C) is also available via a USB using the on-board
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MCP2221A USB adapter. CN1_USBUART_TX_EN and CN1_USBUART_RX_EN are pulled
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low poll on the CPU board in order to connect CN1_RX0 and CN1_TX0 to
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MCP_RX and MCP_TX.
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When the I/O expander board is connected, jumpers J1 and J2 control this
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functionality. These can pull the CN1_USBUART_TX_EN and CN1_USBUART_RX_EN
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pins high and so that UART0 can be used for other purposes.
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UART 1: All of Port C pins can support UART1 functions when configured
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for the alternate function 7. For typical configurations only RXD and TXD
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need be configured.
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eZ80 PIN BOARD SIGNAL CN1 ACCESS
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=======================================
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PC0/TXD1 CN1_TX1 Pin 62
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PC1/RXD1 CN1_RX1 Pin 60
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PC2/RTS1 CN1_RTS1 Pin 64
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PC3/CTS1 CN1_CTS1 Pin 66
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PC4/DTR1 CN1_DTR1 Pin 68
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PC5/DSR1 CN1_DSR1 Pin 70
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PC6/DCD1 CN1_DCD1 Pin 72
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PC7/RIO1 CN1_RI1 Pin 74
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With the I/O exanpander board (and J1 and J2 open), these UARTs can be
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used with a host terminal emulation, by connecting either a TTL-to-RS232
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or a TTL-to-USB Serial adapter to CN1 pins 59 and 61, and 60 and 62,
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depending on the selected UART.
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Serial Keyboard and VGA Display
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-------------------------------
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The serial console can also be implemented using the MakerLisp USB
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Keyboard Controller Board and VGA Display Controller. These are accessed
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via the one UART port, UART0.
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In the default MakerLisp configuration. These boards are connected as
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follows:
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1. VGA display controller connections (UART0 TX)
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Board interface header
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5 – 5V regulated power input
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RX – VGA Display Controller serial input
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C – VGA Display Controller ready output
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TX – VGA Display Controller serial output
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G – GND
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Connections:
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a. 5V '5' pin on VGA board to expansion board power distribution 5V.
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b. Ground 'G' pin on VGA board to expansion board power distribution
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ground.
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c. Receive 'RX' pin on VGA board to expansion board GPIO PD0 (TXD0).
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d. Communication, terminal ready indicator 'C' pin on VGA board to
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expansion board GPIO PB1.
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e. Transmit 'TX' pin on VGA board to USB keyboard controller 'R'
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To use the VGA display controller with stdout and stderr, you also
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need to selection CONFIG_MAKERLISP_VGA=y in your configuration. This
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enables a required VGA initialization sequence.
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2. USB keyboard controller (UART0 RX)
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Board interface header
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5 – 5V regulated power input
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R – USB Keyboard Controller serial input
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T – USB Keyboard Controller serial output
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G – GND
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Connections:
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a. 5V '5' pin on USB board to (other) expansion board power
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distribution 5V.
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b. Ground 'G' pin on USB board to (other) expansion board power
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distribution ground.
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c. Receive 'R' pin on USB board to VGA board 'TX' (see above).
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d. Transmit 'T' pin on USB board to expansion board GPIO PD1 (RXD0).
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If your keyboard does not seem to be doing anything, check the 'RX'
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jumper on the expansion board. For input from a USB keyboard, and NOT
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the USB/UART connection, you want this jumper REMOVED, not bridging the
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two header pins front to back.
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The PC terminal software should be configured as described in the MakerLisp
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Putty HOWTO document: 115200N1 BAUD.
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Default Serial Console
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----------------------
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UART0 is the default serial console in all configurations unless
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otherwise noted in the description of the configuration.
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LEDs and Buttons
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================
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LEDs
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----
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Three LEDs are available on the CPU Card, but none are available for
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general use by applications:
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D2 RED: CPU Card power. Not under eZ80 control
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D3 GREEN: Driven by CPU GPI/O pin. However, it has some additional
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properties:
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1. On input, it will be '1' if the I/O expansion board is
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present.
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2. Setting it to an output of '0' will generate a system reset.
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3. Setting it to an output of '1' will not only illuminate the
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LED take the card out of reset and enable power to the SD
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card slot.
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As a consequence, the GREEN LED will not be illuminated if
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SD card support or SPI is disabled. The only effect of
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CONFIG_ARCH_LEDS is that the GREEN LED will turned off in
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the event of a crash.
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D1 AMBER: Controlled by the on-board MCP2221A USB bridge and provides USB
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enumeration status. Not under eZ80 control.
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Buttons
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-------
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The MakerLisp CPU board has no on-board buttons that can be sensed by the
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eZ80.
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Configurations
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==============
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Common Configuration Notes
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--------------------------
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1. src/ and include/
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These directories contain common logic for all MakerLisp
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configurations.
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2. Variations on the basic MakerLisp configuration are maintained
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in subdirectories. To configure any specific configuration, do the
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following steps:
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tools/configure.sh [OPTIONS] makerlisp:<sub-directory>
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make
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Where <sub-directory> is the specific board configuration that you
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wish to build. Use 'tools/configure.sh -h' to see the possible
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options. Typical options are:
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-l Configure for a Linux host
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-c Configure for a Windows Cygwin host
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-g Configure for a Windows MYS2 host
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Use configure.bat instead of configure.sh if you are building in a
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native Windows environment.
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The available board-specific configurations are summarized in the
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following paragraphs.
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When the build completes successfully, you will find this files in
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the top level nuttx directory:
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a. nuttx.hex - A loadable file in Intel HEX format
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b. nuttx.lod - A loadable file in ZDS-II binary format
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c. nuttx.map - A linker map file
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3. ZDS-II make be used to write the nuttx.lod file to FLASH. General
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instructions:
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a. Start ZDS-II
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b. Open the project, for example, nsh/nsh.zdsproj
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c. Select Debug->Connect To Target
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d. Select Debug->Download code
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There are projects for the ZiLOG Smart Flash Programmer as well but
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these are not functional as of this writing.
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4. This configuration uses the mconf-based configuration tool. To
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change this configurations using that tool, you should:
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a. Build and install the kconfig-mconf tool. See nuttx/README.txt
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see additional README.txt files in the NuttX tools repository.
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b. Execute 'make menuconfig' in nuttx/ in order to start the
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reconfiguration process.
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Configuration Subdirectories
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----------------------------
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nsh_flash, nsh_ram:
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These configuration build the NuttShell (NSH). That code can be
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found in apps/system/nsh and apps/system/nshlib.. For more
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information see: apps/system/nsh/README.txt and
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Documentation/NuttShell.html.
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NOTES:
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1. The two configurations different only in that one builds for
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execution entirely from FLASH and the other for execution entirely
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from RAM. A bootloader of some kind is required to support such
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execution from RAM! This difference is reflected in a single
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configuration setting:
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CONFIG_BOOT_RUNFROMFLASH=y # Execute from flash (default)
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CONFIG_BOOT_RUNFROMEXTSRAM=y # Execute from external SRAM
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A third configuration is possible but not formalized with its own
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defconfig file: You can also configure the code to boot from FLASH,
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copy the code to external SRAM, and then execute from RAM. Such a
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configuration needs the following settings in the .config file:
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CONFIG_BOOT_RUNFROMEXTSRAM=y # Execute from external SRAM
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CONFIG_MAKERLISP_COPYTORAM=y # Boot from FLASH but copy to SRAM
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Why execute from SRAM at all? Because you will get MUCH better
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performance because of the zero wait state SRAM implementation.
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2. A serial console is provided on UART0. This configuration should work
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with or without the the VGA and Keyboard adapter boards. Normal
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connectivity is via host serial console connected through the USB
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serial console.
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With the I/O expansion board, the serial console can also be used with
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either a TTL-to-RS232 or a TTL-to-USB Serial adapter connected by CN1
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pins 59 and 61.
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The default baud setting is 115200N1.
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To use the VGA display controller with stdin, stdout and stderr, you
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also need to selection CONFIG_MAKERLISP_VGA=y in your configuration.
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This enables a required VGA initialization sequence.
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The PC terminal software should be configured as described in the
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MakerLisp Putty HOWTO document: 115200N1 BAUD.
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3. The eZ80 RTC, the procFS file system, and SD card support in included.
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The procFS file system will be auto-mounted at /proc when the board
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boots.
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The RTC can be read and set from the NSH date command.
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nsh> date
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Thu, Dec 19 20:53:29 2086
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nsh> help date
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date usage: date [-s "MMM DD HH:MM:SS YYYY"]
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nsh> date -s "Jun 16 15:09:00 2019"
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nsh> date
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Sun, Jun 16 15:09:01 2019
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When the system boots, it will probe the SD card and create a
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block driver called mmcsd0:
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nsh> ls /dev
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/dev:
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console
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mmcsd0
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null
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ttyS0
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nsh> mount
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/proc type procfs
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The SD card can be mounted with the following NSH mount command:
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nsh> mount -t vfat /dev/mmcsd0 /mnt/sdcard
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nsh> ls /mnt
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/mnt:
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sdcard/
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nsh> mount
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/mnt/sdcard type vfat
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/proc type procfs
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nsh> ls -lR /mnt/sdcard
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/mnt/sdcard:
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drw-rw-rw- 0 System Volume Information/
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/mnt/sdcard/System Volume Information:
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-rw-rw-rw- 76 IndexerVolumeGuid
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-rw-rw-rw- 12 WPSettings.dat
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You can they use the SD card as any other file system.
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nsh> ls /mnt/sdcard
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/mnt/sdcard:
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System Volume Information/
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nsh> echo "This is a test" >/mnt/sdcard/atest.txt
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nsh> ls /mnt/sdcard
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/mnt/sdcard:
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System Volume Information/
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atest.txt
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nsh> cat /mnt/sdcard/atest.txt
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This is a test
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Don't forget to un-mount the volume before power cycling:
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nsh> mount
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/mnt/sdcard type vfat
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/proc type procfs
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nsh> umount /mnt/sdcard
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nsh> mount
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/proc type procfs
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NOTE: The is no card detect signal so the microSD card must be
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placed in the card slot before the system is started.
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4. Debugging the RAM version
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You can debug the all RAM version using ZDS-II as follows:
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a. Connect to the debugger,
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b. Reset, Go, and Break. This will initialize the external RAM
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c. Break and Load the nuttx.lod file
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c. Set the PC to 0x040000
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d. Single step a few times to make sure things look good, then
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e. Go
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5. Optimizations:
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- The stack sizes have not been tuned and, hence, are probably too
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large.
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STATUS:
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2019-06-16: The basic NSH configuration appears to be fully functional
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using only the CPU and I/O expansion card. Console is provided over
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USB.
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Added support for SPI-based SD cards, the RTC and procFS. There are
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still a few issues at the end-of-the-day: (1) the SD card initialization
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hangs and prevents booting, and (2) RTC does not preserve time across a
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power cycle.
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2019-06-17: The SD initialization was due to some error in the SPI driver:
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It waits for a byte transfer to complete but it never receives the
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indication that the transfer completed. That SPI problem has been
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fixed and now the SD card is functional.
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2019-06-18: The RTC now appears to be fully functional.
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2019-06-26: Renamed nsh configuration to nsh_flash. Added nsh_ram
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configuration. Not yet verified.
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2019-07-09: The RAM version does not run! I can single step through
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the initialization and all looks well, but when I "Go", the system
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crashes. The PC is sitting at a crazy address when I break in. I
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have not yet debugged this.
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The identical FLASH version, differing only in the selected linker
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script, works just fine. This implies some issue with the
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configuration of SRAM for execution.
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sdboot
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This configuration implements a very simple boot loader. In runs from
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FLASH and simply initializes the external SRAM, mounts the FAT file
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system on the SD card, and checks to see if there is a file called
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nuttx.hex on the SD card. If so, it will load the Intel HEX file into
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memory and jump to address 0x040000. This, of course, assumes that
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the application's reset vector resides at address 0x040000 in external
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SRAM.
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The boot loader source is located at boards/makerlisp/src/sd_main.c.
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STATUS:
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2019-06-26: Configuration added. Not yet verified.
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nsh_flash/README.txt
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^^^^^^^^^^^^^^^^^^^^
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nsh.zdsproj is a simple ZDS-II project that will allow you
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to use the ZDS-II debugger.
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nsh.zfpproj is a simple project that will allow you to use the Smart Flash
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Programming. NOTE: As of this writing this project does not work, probably
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due to RAM configuration in the project. Use ZDS-II instead as is described
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in the upper README.txt file
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nsh_flash.ztgt is the target file that accompanies the project files. This
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one is identical to boards/scripts/makerlisp_ram.ztgt.
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nsh_ram.ztgt is the target file that accompanies the project files. This
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one is identical to boards/scripts/makerlisp_flash.ztgt.
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sdboot/README.txt
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^^^^^^^^^^^^^^^^^
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sdboot.zdsproj is a simple ZDS-II project that will allow you
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to use the ZDS-II debugger.
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sdboot.zfpproj is a simple project that will allow you to use the Smart Flash
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Programming. NOTE: As of this writing this project does not work, probably
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due to RAM configuration in the project. Use ZDS-II instead as is described
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in the upper README.txt file
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sdboot_flash.ztgt is the target file that accompanies the project files. This
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one is identical to boards/scripts/makerlisp_ram.ztgt.
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sdboot_ram.ztgt is the target file that accompanies the project files. This
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one is identical to boards/scripts/makerlisp_flash.ztgt.
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nsh_ram/README.txt
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^^^^^^^^^^^^^^^^^^
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nsh.zdsproj is a simple ZDS-II project that will allow you
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to use the ZDS-II debugger.
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nsh.zfpproj is a simple project that will allow you to use the Smart Flash
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Programming. NOTE: As of this writing this project does not work, probably
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due to RAM configuration in the project. Use ZDS-II instead as is described
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in the upper README.txt file
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nsh_flash.ztgt is the target file that accompanies the project files. This
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one is identical to boards/scripts/makerlisp_ram.ztgt.
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nsh_ram.ztgt is the target file that accompanies the project files. This
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one is identical to boards/scripts/makerlisp_flash.ztgt.
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