diff --git a/tcl/board/kasli.cfg b/tcl/board/kasli.cfg
index 4d96a8f7c..2c5e26853 100644
--- a/tcl/board/kasli.cfg
+++ b/tcl/board/kasli.cfg
@@ -12,3 +12,4 @@ adapter_khz 25000
 source [find cpld/xilinx-xc7.cfg]
 source [find cpld/jtagspi.cfg]
 source [find fpga/xilinx-xadc.cfg]
+source [find fpga/xilinx-dna.cfg]
diff --git a/tcl/board/kc705.cfg b/tcl/board/kc705.cfg
index d6b835a5f..e032e9b21 100644
--- a/tcl/board/kc705.cfg
+++ b/tcl/board/kc705.cfg
@@ -4,6 +4,7 @@ source [find interface/ftdi/digilent-hs1.cfg]
 source [find cpld/xilinx-xc7.cfg]
 source [find cpld/jtagspi.cfg]
 source [find fpga/xilinx-xadc.cfg]
+source [find fpga/xilinx-dna.cfg]
 adapter_khz 25000
 
 # example command to write bitstream, soft-cpu bios and runtime:
diff --git a/tcl/fpga/xilinx-dna.cfg b/tcl/fpga/xilinx-dna.cfg
new file mode 100644
index 000000000..a1d5ba376
--- /dev/null
+++ b/tcl/fpga/xilinx-dna.cfg
@@ -0,0 +1,43 @@
+proc xilinx_dna_addr {chip} {
+	array set addrs {
+		Spartan6 0x30
+		Series7 0x17
+	}
+	return $addrs($chip)
+}
+
+# Get the "Device DNA".
+# Most Xilinx FPGA devices contain an embedded, unique device identifier.
+# The identifier is nonvolatile, permanently programmed into
+# the FPGA, and is unchangeable providing a great serial / tracking number.
+# This function returns the DNA as a 64 bit integer with the 7 LSBs zeroed.
+# This is compatible with the FUSE DNA which contains all 64 bits.
+proc xilinx_get_dna {tap chip} {
+	set XC7_ISC_ENABLE 0x10
+	set XC7_ISC_DISABLE 0x16
+	set XC7_ISC_DNA [xilinx_dna_addr $chip]
+
+	irscan $tap $XC7_ISC_ENABLE
+	runtest 64
+	irscan $tap $XC7_ISC_DNA
+	scan [drscan $tap 32 0 32 0] "%08x %08x" hi lo
+	runtest 64
+	irscan $tap $XC7_ISC_DISABLE
+	runtest 64
+	# openocd interprets DR scans as LSB first, bit-reverse it
+	return [scan [string reverse [format "%032b%032bb0" $lo $hi]] "%i"]
+}
+
+# Print out the "Device DNA" in the same format that impact uses.
+proc xilinx_print_dna {dna} {
+	set dna [expr $dna >> 64 - 57]
+	echo [format "DNA = %057b (0x%016x)" $dna $dna]
+}
+
+proc xc7_get_dna {tap} {
+	return [xilinx_get_dna $tap Series7]
+}
+
+proc xc6s_get_dna {tap} {
+	return [xilinx_get_dna $tap Spartan6]
+}