diff --git a/techlibs/xilinx/example_mojo_counter/README b/techlibs/xilinx/example_mojo_counter/README
deleted file mode 100644
index 690a9d843..000000000
--- a/techlibs/xilinx/example_mojo_counter/README
+++ /dev/null
@@ -1,10 +0,0 @@
-
-This is a simple example for Yosys synthesis targeting the Mojo FPGA
-development board [1, 2]. Simple script for xst-based synthesis (incl.
-generation of reference edif files) and uploading to the board can be
-found here [3].
-
-[1] http://embeddedmicro.com/tutorials/mojo
-[2] https://www.sparkfun.com/products/11953
-[3] http://svn.clifford.at/handicraft/2013/mojo/
-
diff --git a/techlibs/xilinx/example_mojo_counter/example.sh b/techlibs/xilinx/example_mojo_counter/example.sh
deleted file mode 100644
index 74a0c117f..000000000
--- a/techlibs/xilinx/example_mojo_counter/example.sh
+++ /dev/null
@@ -1,18 +0,0 @@
-#!/bin/bash
-
-set -ex
-
-XILINX_DIR=/opt/Xilinx/14.5/ISE_DS/ISE
-XILINX_PART=xc6slx9-2-tqg144
-
-../../../yosys - <<- EOT
-	read_verilog example.v
-	synth_xilinx -edif synth.edif
-EOT
-
-$XILINX_DIR/bin/lin64/edif2ngd -a synth.edif synth.ngo
-$XILINX_DIR/bin/lin64/ngdbuild -p $XILINX_PART -uc example.ucf synth.ngo synth.ngd
-$XILINX_DIR/bin/lin64/map -p $XILINX_PART -w -o mapped.ncd synth.ngd constraints.pcf
-$XILINX_DIR/bin/lin64/par -w mapped.ncd placed.ncd constraints.pcf
-$XILINX_DIR/bin/lin64/bitgen -w placed.ncd example.bit constraints.pcf
-
diff --git a/techlibs/xilinx/example_mojo_counter/example.ucf b/techlibs/xilinx/example_mojo_counter/example.ucf
deleted file mode 100644
index 93d97b4dc..000000000
--- a/techlibs/xilinx/example_mojo_counter/example.ucf
+++ /dev/null
@@ -1,14 +0,0 @@
-NET "clk" TNM_NET = clk;
-TIMESPEC TS_clk = PERIOD "clk" 50 MHz HIGH 50%;
-
-NET "clk" LOC = P56;
-NET "ctrl" LOC = P1;
-
-NET "led_0" LOC = P134;
-NET "led_1" LOC = P133;
-NET "led_2" LOC = P132;
-NET "led_3" LOC = P131;
-NET "led_4" LOC = P127;
-NET "led_5" LOC = P126;
-NET "led_6" LOC = P124;
-NET "led_7" LOC = P123;
diff --git a/techlibs/xilinx/example_mojo_counter/example.v b/techlibs/xilinx/example_mojo_counter/example.v
deleted file mode 100644
index cb98cc1b2..000000000
--- a/techlibs/xilinx/example_mojo_counter/example.v
+++ /dev/null
@@ -1,14 +0,0 @@
-module top(clk, ctrl, led_7, led_6, led_5, led_4, led_3, led_2, led_1, led_0);
-
-input clk, ctrl;
-output led_7, led_6, led_5, led_4;
-output led_3, led_2, led_1, led_0;
-
-reg [31:0] counter;
-
-always @(posedge clk)
-	counter <= counter + (ctrl ? 4 : 1);
-
-assign {led_7, led_6, led_5, led_4, led_3, led_2, led_1, led_0} = counter >> 24;
-
-endmodule
diff --git a/techlibs/xilinx/example_sim_counter/counter.v b/techlibs/xilinx/example_sim_counter/counter.v
deleted file mode 100644
index 72208bd80..000000000
--- a/techlibs/xilinx/example_sim_counter/counter.v
+++ /dev/null
@@ -1,12 +0,0 @@
-module counter (clk, rst, en, count);
-
-   input clk, rst, en;
-   output reg [3:0] count;
-   
-   always @(posedge clk)
-      if (rst)
-         count <= 4'd0;
-      else if (en)
-         count <= count + 4'd1;
-
-endmodule
diff --git a/techlibs/xilinx/example_sim_counter/counter_tb.v b/techlibs/xilinx/example_sim_counter/counter_tb.v
deleted file mode 100644
index b6b64269e..000000000
--- a/techlibs/xilinx/example_sim_counter/counter_tb.v
+++ /dev/null
@@ -1,61 +0,0 @@
-`timescale  1 ns / 1 ps
-
-module testbench;
-
-reg clk, en, rst;
-wire [3:0] count;
-
-counter uut_counter(
-	.clk(clk),
-	.count(count),
-	.en(en),
-	.rst(rst)
-);
-
-initial begin
-	clk <= 0;
-	forever begin
-		#50;
-		clk <= ~clk;
-	end
-end
-
-initial begin
-	@(posedge clk);
-	forever begin
-		@(posedge clk);
-		$display("%d", count);
-	end
-end
-
-initial begin
-	rst <= 1; en <= 0; @(posedge clk);
-	rst <= 1; en <= 0; @(posedge clk);
-	rst <= 0; en <= 0; @(posedge clk);
-	rst <= 0; en <= 1; @(posedge clk);
-	rst <= 0; en <= 1; @(posedge clk);
-	rst <= 0; en <= 1; @(posedge clk);
-	rst <= 0; en <= 0; @(posedge clk);
-	rst <= 0; en <= 1; @(posedge clk);
-	rst <= 0; en <= 1; @(posedge clk);
-	rst <= 0; en <= 1; @(posedge clk);
-	rst <= 1; en <= 1; @(posedge clk);
-	rst <= 0; en <= 0; @(posedge clk);
-	rst <= 0; en <= 1; @(posedge clk);
-	rst <= 0; en <= 1; @(posedge clk);
-	rst <= 0; en <= 0; @(posedge clk);
-	rst <= 0; en <= 1; @(posedge clk);
-	rst <= 0; en <= 1; @(posedge clk);
-	rst <= 0; en <= 0; @(posedge clk);
-	rst <= 1; en <= 0; @(posedge clk);
-	rst <= 0; en <= 1; @(posedge clk);
-	rst <= 0; en <= 0; @(posedge clk);
-	rst <= 0; en <= 1; @(posedge clk);
-	rst <= 0; en <= 1; @(posedge clk);
-	rst <= 0; en <= 0; @(posedge clk);
-	rst <= 0; en <= 1; @(posedge clk);
-	rst <= 0; en <= 0; @(posedge clk);
-	$finish;
-end
-
-endmodule
diff --git a/techlibs/xilinx/example_sim_counter/run_sim.sh b/techlibs/xilinx/example_sim_counter/run_sim.sh
deleted file mode 100644
index b8354c002..000000000
--- a/techlibs/xilinx/example_sim_counter/run_sim.sh
+++ /dev/null
@@ -1,23 +0,0 @@
-#!/bin/bash
-
-set -ex
-
-XILINX_DIR=/opt/Xilinx/14.5/ISE_DS/ISE
-
-../../../yosys -p 'synth_xilinx -top counter; write_verilog -noattr testbench_synth.v' counter.v
-
-iverilog -o testbench_gold counter_tb.v counter.v
-iverilog -o testbench_gate counter_tb.v testbench_synth.v \
-	$XILINX_DIR/verilog/src/{glbl,unisims/{FDRE,LUT1,LUT2,LUT3,LUT4,LUT5,LUT6,BUFGP,IBUF}}.v
-
-./testbench_gold > testbench_gold.txt
-./testbench_gate > testbench_gate.txt
-
-if diff -u testbench_gold.txt testbench_gate.txt; then
-	set +x; echo; echo; banner "  PASS  "
-else
-	exit 1
-fi
-
-rm -f testbench_{synth,gold,gate,mapped}*
-
diff --git a/techlibs/xilinx/example_zed_counter/README b/techlibs/xilinx/example_zed_counter/README
deleted file mode 100644
index 539f24e73..000000000
--- a/techlibs/xilinx/example_zed_counter/README
+++ /dev/null
@@ -1,10 +0,0 @@
-
-This is a simple example for Yosys synthesis targeting the ZED FPGA
-development board [1, 2]. Simple script for xst-based synthesis (incl.
-generation of reference edif files) and uploading to the board can be
-found here [3].
-
-[1] http://www.zedboard.org/
-[2] https://www.xilinx.com/zynq/
-[3] http://verilog.james.walms.co.uk/
-
diff --git a/techlibs/xilinx/example_zed_counter/example.sh b/techlibs/xilinx/example_zed_counter/example.sh
deleted file mode 100644
index d0fcd8322..000000000
--- a/techlibs/xilinx/example_zed_counter/example.sh
+++ /dev/null
@@ -1,18 +0,0 @@
-#!/bin/bash
-
-set -ex
-
-XILINX_DIR=/opt/Xilinx/14.7/ISE_DS/ISE
-XILINX_PART=xc7z020clg484-1
-
-yosys - <<- EOT
-	read_verilog example.v
-	synth_xilinx -edif synth.edif
-EOT
-
-$XILINX_DIR/bin/lin64/edif2ngd -a synth.edif synth.ngo
-$XILINX_DIR/bin/lin64/ngdbuild -p $XILINX_PART -uc example.ucf synth.ngo synth.ngd
-$XILINX_DIR/bin/lin64/map -p $XILINX_PART -w -o mapped.ncd synth.ngd constraints.pcf
-$XILINX_DIR/bin/lin64/par -w mapped.ncd placed.ncd constraints.pcf
-$XILINX_DIR/bin/lin64/bitgen -w placed.ncd example.bit constraints.pcf
-$XILINX_DIR/bin/lin64/promgen -w -b -p bin -o example.bin -u 0 example.bit -data_width 32
diff --git a/techlibs/xilinx/example_zed_counter/example.ucf b/techlibs/xilinx/example_zed_counter/example.ucf
deleted file mode 100644
index dadc8373c..000000000
--- a/techlibs/xilinx/example_zed_counter/example.ucf
+++ /dev/null
@@ -1,14 +0,0 @@
-NET "clk" TNM_NET = clk;
-TIMESPEC TS_clk = PERIOD "clk" 50 MHz HIGH 50%;
-
-NET "clk" LOC = Y9		| IOSTANDARD=LVCMOS33;  # "GCLK"
-NET "ctrl" LOC = P16	| IOSTANDARD=LVCMOS18;  # "BTNC"
-
-NET "led_0" LOC = T22 | IOSTANDARD=LVCMOS33;  # "LD0"
-NET "led_1" LOC = T21 | IOSTANDARD=LVCMOS33;  # "LD0"
-NET "led_2" LOC = U22 | IOSTANDARD=LVCMOS33;  # "LD0"
-NET "led_3" LOC = U21 | IOSTANDARD=LVCMOS33;  # "LD0"
-NET "led_4" LOC = V22 | IOSTANDARD=LVCMOS33;  # "LD0"
-NET "led_5" LOC = W22 | IOSTANDARD=LVCMOS33;  # "LD0"
-NET "led_6" LOC = U19 | IOSTANDARD=LVCMOS33;  # "LD0"
-NET "led_7" LOC = U14 | IOSTANDARD=LVCMOS33;  # "LD0"
diff --git a/techlibs/xilinx/example_zed_counter/example.v b/techlibs/xilinx/example_zed_counter/example.v
deleted file mode 100644
index cb98cc1b2..000000000
--- a/techlibs/xilinx/example_zed_counter/example.v
+++ /dev/null
@@ -1,14 +0,0 @@
-module top(clk, ctrl, led_7, led_6, led_5, led_4, led_3, led_2, led_1, led_0);
-
-input clk, ctrl;
-output led_7, led_6, led_5, led_4;
-output led_3, led_2, led_1, led_0;
-
-reg [31:0] counter;
-
-always @(posedge clk)
-	counter <= counter + (ctrl ? 4 : 1);
-
-assign {led_7, led_6, led_5, led_4, led_3, led_2, led_1, led_0} = counter >> 24;
-
-endmodule