make it possible to specify the USB bus

[usb-driver] / README

diff --git a/README b/README
index 9091cc4ffadced6d6da4b858de5da33a1435465a..f9b6cec9bb558abf9466d6f9f51b914710f53cc4 100644 (file)
--- a/README
+++ b/README
@@ -9,11 +9,13 @@ 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 9.2SP1
  * ISE Webpack 9.1SP3
  * ISE Webpack 9.1SP2
  * ISE Webpack 9.1SP1
  * ISE Webpack 8.2SP3
  * ISE Webpack 8.1SP3
+ * ChipScope 9.2.01i
  * ChipScope 9.1.03i
  * ChipScope 9.1.02i
  * ChipScope 8.2.04i
@@ -72,6 +74,14 @@ these steps:
 4. restart udev and re-plug the cable
 
 
+If you have multiple cables connected, you can specify the cable to use
+in the XILINX_USB_DEV environment-variable as "bus:device".
+These identifiers are available in the output of lsusb:
+Bus 001 Device 004: ID 03fd:0008 Xilinx, Inc.
+    ^^^        ^^^
+To use this cable, set the XILINX_USB_DEV variable to "001:004".
+
+
 Notes for the parallel cable
 ============================