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DM8148: Failed to change MAC address in Linux

Hi,

My customer wants to change MAC address in Linux, but failed. Would you pls kindly advise what is missed? Pls find detail follow below. I tried with TI814X-LINUX-PSP-04.01.00.05.

root@ubuntu-dm814x-evm:~# ifconfig -a
eth0      Link encap:Ethernet  HWaddr c6:18:ec:61:1e:ec
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:40

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

root@ubuntu-dm814x-evm:~# ifconfig eth0 down
root@ubuntu-dm814x-evm:~# ifconfig eth0 hw ether 00:0C:18:EF:FF:ED
root@ubuntu-dm814x-evm:~# ifconfig eth0 up

CPSW phy found : id is : 0x4dd074
root@ubuntu-dm814x-evm:~# ifconfig -a
eth0      Link encap:Ethernet  HWaddr c6:18:ec:61:1e:ec
          inet6 addr: fe80::c418:ecff:fe61:1eec/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:142 errors:0 dropped:99 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:12536 (12.5 KB)  TX bytes:468 (468.0 B)
          Interrupt:40

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0