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[usb-driver] / README

This library emulates Jungo Windrvr USB and parallel port functions in
userspace which are required by XILINX impact to access the Platform cable USB
and Parallel Cable III.
With this library it is possible to access the cables without loading a
proprietary kernel module which breaks with every new kernel release. It uses
the functions provided by the libusb userspace library for USB access and
the kernel interface at /dev/parport0 for parallel port access instead and
should work on every kernel version which is supported by libusb and supports
ppdev. It was written against impact from ISE Webpack 9.1SP1 and tested with
the following software:

 * ISE Webpack 9.1SP2
 * ISE Webpack 9.1SP1
 * ISE Webpack 8.2SP3
 * ISE Webpack 8.1SP3
 * ChipScope 9.1.02i
 * EDK 8.2.02i

Build the library by calling `make'.

To use this library you have to preload the library before starting impact:

$ LD_PRELOAD=/path/to/libusb-driver.so impact
or
$ export LD_PRELOAD=/path/to/libusb-driver.so  (for sh shells)
$ setenv LD_PRELOAD /path/to/libusb-driver.so  (for csh shells)
$ impact


Notes for the USB cable
=======================

To use the device as an ordinary user, put the following line in a new
file in /etc/udev/rules.d/ and restart udev:
ACTION=="add", BUS=="usb", SYSFS{idVendor}=="03fd", MODE="666"


If your cable does not have the ID 03fd:0008 in the output of lsusb,
the initial firmware has not been loaded (loading it changes the
product-ID from another value to 8). To load the firmware follow
these steps:

1. If you have no /etc/udev/rules.d/xusbdfwu.rules file, copy it from
   /path/to/ISE/bin/lin/xusbdfwu.rules to /etc/udev/rules.d/xusbdfwu.rules

2. Install the package containing /sbin/fxload from your linux distribution.
   It is usually called "fxload"

3. copy the file /path/to/ISE/bin/lin/xusbdfwu.hex to /usr/share/xusbdfwu.hex

4. restart udev and re-plug the cable


Notes for the parallel cable
============================

To access the parallel port from userspace, the kernel needs to be built with
the features "Parallel port support" (CONFIG_PARPORT), "PC-style hardware"
(CONFIG_PARPORT_PC) and "Support for user-space parallel port device drivers"
(CONFIG_PPDEV) builtin or as modules. If these features are built as modules,
they need to be loaded before using this library.
These modules are called:
parport
parport_pc
ppdev


To use the device as an ordinary user, put the user in the group 'lp'