Renesas RZ/G1E serial no

Dear all,

I need to have different Unique serial number in different Renesas RZ/G1E board, now in all the RZ/G1E board i am having serial number shown as 0 only, how to update serial number in RZ/G1E board,

Please find the below log

root@iwg22m:~#
root@iwg22m:~#
root@iwg22m:~#
root@iwg22m:~#
root@iwg22m:~# cat /proc/cpuinfo
processor : 0
model name : ARMv7 Processor rev 5 (v7l)
BogoMIPS : 65.00
Features : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part : 0xc07
CPU revision : 5

processor : 1
model name : ARMv7 Processor rev 5 (v7l)
BogoMIPS : 65.00
Features : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part : 0xc07
CPU revision : 5

Hardware : Generic R8A7745 (Flattened Device Tree)
Revision : 0000
Serial : 0000000000000000

Please help me to solve this issue