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Altera_Forum
Honored Contributor I
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Troubele passing bootargs to set open ethernet mac address

Hi, 

 

I am having trouble passing the mac address from u-boot. 

I am using the nios2-linux-20100621.tar.gz distribution with OpenCores ethernet 10/100 MAC. 

 

My bootargs passes this to linux 

CONSOLE=/dev/ttyS0 root=/dev/ram0 rw panic=10 mtdparts=flash-0:256k(PART0)ro,128k(PART1),128k(PART2),1536k(PART3),32m(PART4),16m(PART5),8m(PART6),5088k(PART7),256k(PART8)ro oeth_mac=00:1b:97:00:01:3b mzt_diag 

 

And this is reported on console 0.000000] Kernel command line: CONSOLE=/dev/ttyS0 root=/dev/ram0 rw panic=10 mtdparts=flash-0:256k(PART0)ro,128k(PART1),128k(PART2),1536k(PART3),32m(PART4),16m(PART5),8m(PART6),5088k(PART7),256k(PART8)ro oeth_mac=00:1b:97:00:01:3b mzt_diag 

 

However, ifconfig reports the hardcoded mac address 

root:~> ifconfig -a 

eth0 Link encap:Ethernet HWaddr 00:07:ED:0A:03:29  

inet addr:10.1.2.104 Bcast:10.1.2.255 Mask:255.255.255.0 

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 

RX packets:1238 errors:0 dropped:21 overruns:0 frame:16 

TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 

collisions:0 txqueuelen:1000  

Interrupt:4 Base address:0x1000 Memory:4000-7fff  

 

 

I have selected the parse command line option in kernel config. 

 

Any ideas whats wrong? Is oeth_mac the correct bootargs variable? 

 

BTW, the ethernet link is up and working albeit with the wrong mac address. I can do telnet from and to my controller. 

 

Thanks in advance, 

Barada
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