1 # SPDX-License-Identifier: GPL-2.0-or-later
3 proc xilinx_dna_addr {chip} {
11 # Get the "Device DNA".
12 # Most Xilinx FPGA devices contain an embedded, unique device identifier.
13 # The identifier is nonvolatile, permanently programmed into
14 # the FPGA, and is unchangeable providing a great serial / tracking number.
15 # This function returns the DNA as a 64 bit integer with the 7 LSBs zeroed.
16 # This is compatible with the FUSE DNA which contains all 64 bits.
17 proc xilinx_get_dna {tap chip} {
18 set XC7_ISC_ENABLE 0x10
19 set XC7_ISC_DISABLE 0x16
20 set XC7_ISC_DNA [xilinx_dna_addr $chip]
22 irscan $tap $XC7_ISC_ENABLE
24 irscan $tap $XC7_ISC_DNA
25 scan [drscan $tap 32 0 32 0] "%08x %08x" hi lo
27 irscan $tap $XC7_ISC_DISABLE
29 # openocd interprets DR scans as LSB first, bit-reverse it
30 return [scan [string reverse [format "%032b%032bb0" $lo $hi]] "%i"]
33 # Print out the "Device DNA" in the same format that impact uses.
34 proc xilinx_print_dna {dna} {
35 set dna [expr {$dna >> 64 - 57}]
36 echo [format "DNA = %057b (0x%016x)" $dna $dna]
39 proc xc7_get_dna {tap} {
40 return [xilinx_get_dna $tap Series7]
43 proc xc6s_get_dna {tap} {
44 return [xilinx_get_dna $tap Spartan6]