MM1 Serial JTAG interface board

[edit] Hardware

 Features:
 * Chip: FT2232H
 * USB 2.0  480 Mbs interface  VID:PID == 20b7:0713
 * 3.3V UART with speeds up to 12 Mbs
 * 2.0-3.3 V JTAG

Note: On MM1 RC2 you might need to clip the serial header pins in order to align JTAG and serial connector with the interface card.

Recent Linux kernels contain kernel support, enable CONFIG_USB_SERIAL_FTDI_SIO in your kernel config file:

 make menuconfig
 
 Select:
  Device drivers/
    USB Support/
      USB Serial Converter Support/
        USB FTDI Single Port Serial Driver

This will build the ftdi_sio module. Then after loading the module you should see something like below in the dmesg.

 [ xxxx.xxxxxx] usb 3-1: FTDI USB Serial Device converter now attached to ttyUSB0

Now connect your terminal emulator of choice and have fun.

The JTAG enables you to:

1. Reprogram the FPGA or flash chip of the MM1, see Flashing the Milkymist One

2. Do some JTAG assisted debugging, TODO

Get the source:

 # git clone git://urjtag.git.sourceforge.net/gitroot/urjtag/urjtag

Alternatively you can download a snapshot from [gitweb] which saves some space and bandwidth

Create the configure files

Before you attempt to compile URJTAG make sure you have the following:

you can skip building the eeprom tool if your device is already preconfigured.

2. gettext

A recent version of gettext is needed if autogen complains about the missing cvs

 ./autogen.sh

Once you see ft2232 listed as a cable driver, you are ready for the next step.

Make & install

 make
 make install

Test

 jtag
 > cable milkymist
 > detect

Your FPGA type should be detected.