Linux version of playxsvf
-------------------------

playxsvf can be used to program Xilinx CPLDs under Linux. It takes an
XSVF file as input, which can be generated from a .JED file using the Xilinx
tools as follows:

Start iMPACT (under Windows or Wine)
Click Edit -> Preferences and verify that "Concurrent Mode (CPLD & EPROM)"
  is unchecked
Click menu Mode -> File Mode
Click tab SVF-STAPL
Right click - Add Xilinx Device - open JED file
Click menu Output -> SVF File -> Create SVF File
Choose your SVF filename
Click OK
Right click device and hit menu Program...
Check that Erase before programming and Verify are selected
Click OK
Click menu Output -> SVF File -> Close File

Now convert the SVF file into an XSVF file using tools from
ftp://ftp.xilinx.com/pub/swhelp/cpld/eisp_pc.zip

svf2xsvf -d -r 0 -extensions -xwait -i 070803_NAND_ground.svf
    -o 070803_NAND_ground.xsvf

If it complains about [drcapture] invalid stable state, check the iMPACT
preferences as described above.

Now you're ready to program. Connect the Xilinx DLC5 cable to LPT1 and do
(as root)
playxsvf [-v n] 070803_NAND_ground.xsvf

The [-v n] option changes verbosity from 0 to 4.

Caveats
-------
playxsvf assumes you're using LPT1, doesn't attempt to use any other ports,
and bashes the hardware directly.

If you're programming a Balloon Board with the sound hardware populated,
remember that the sound hardware must be powered up for programming to work.
You can use balloon-audio-off (and other parallel port, or another PC) to do
this. It is also possible, but not recommended due to the risk of damage to
the CPLD, to ground pin 8 of U24, the MAX894 between the debug connector
and the row of LEDs.

Notes
-----
This code is based heavily on the Xilinx XSVF player code available from
ftp://ftp.xilinx.com/pub/swhelp/cpld/eisp_pc.zip
and described in Xilinx application note XAPP058.