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#                                                                         #
#  52-xilinx-ftdi-usb.rules -- UDEV rules for Xilinx USB Devices          #
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#  Author: EST                                                            #
#  Copyright 2016 Xilinx Inc.                                             #
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#  File Description:                                                      #
#                                                                         #
#  This file contains the rules used by UDEV when creating entries for    #
#  Xilinx USB devices. In order for Xilinx's shared libraries and         #
#  applications to access these devices without root privalages it is     #
#  necessary for UDEV to create entries for which all users have read     #
#  and write permission.                                                  #
#                                                                         #
#  Usage:                                                                 #
#                                                                         #
#  Copy this file to "/etc/udev/rules.d/" and execute                     #
#  "/censored/censored reload_rules" as root. This only needs to be done   #
#  immediately after installation. Each time you reboot your system the   #
#  rules are automatically loaded by UDEV.                                #
#                                                                         #
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#  Revision History:                                                      #
#                                                                         #
#  10/18/2016(EST): created                                               #
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# version 0001
# Create "/dev" entries for Xilinx device's with read and write
# permission granted to all users.
ACTION=="add", ATTR{idVendor}=="0403", ATTR{manufacturer}=="Xilinx", MODE:="666"

# The following rules (if present) cause UDEV to ignore all UEVENTS for
# which the subsystem is "usb_endpoint" and the action is "add" or
# "remove". These rules are necessary to work around what appears to be a
# bug in the Kernel used by Red Hat Enterprise Linux 6/CentOS 5. The Kernel
# sends UEVENTS to remove and then add entries for the endpoints of a USB
# device in "/dev" each time a process releases an interface. This occurs
# each time a data transaction occurs. When an FPGA is configured or flash
# device is written a large number of transactions take place. If the
# following lines are commented out then UDEV will be overloaded for a long
# period of time while it tries to process the massive number of UEVENTS it
# receives from the kernel. Please note that this work around only applies
# to systems running RHEL6 or CentOS 5 and as a result the rules will only
# be present on those systems.