Update README to be clearer
The example doesn't work out of the box with the iCEblink40-lp1k board.
diff --git a/examples/iceblink/README b/examples/iceblink/README
index 73846fa..d5ef8e6 100644
--- a/examples/iceblink/README
+++ b/examples/iceblink/README
@@ -2,7 +2,8 @@
-iCEblink40-HX1K
-iCEblink40-LP1K
-This example assumes the iCEblink40-HX1K board.
+This example assumes the iCEblink40-HX1K board.
+The iCEblink40-LP1K is *not* compatible with this example without modification.
The iCEblink40 boards have an on-board programmer with USB interface from Digilent.
You need iCEburn to program the FPGA via this interface (or the original vendor
