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Changing/Assigning MAC address

Deniz Kocak
Prodigy 220 points
Other Parts Discussed in Thread: OMAPL138

Hi All,

I have been using evm 6678 for network programming. I just modified the hua demo in order to initialize the ethernet and then developed my socket application. However, I would like to change the MAC address of the PHY in order to get MAC address from a different source rather than the one hardcoded in EVM. I think EVM has a MAC address burned in factory which can be got by CSL_BootCfgGetMacIdentifier function inside the EMACInit_Core function. What I want to do is just assign a different MAC address. I searched for a possible solution like;

* Writing the new MAC address to MACADDRLO and MACADDRHI registers. (If I am right what should I do after writing the MAC value? Just writing it is enough or not?)

* By using NIMUIoctl function in stkmain.h.

Would you please suggest a method in order to assign a different MAC? If the ones above possible, would you please elaborate the procedure?

Regards

 

EVM 6678

NDK 2.20.04.26

  • 0
    TI__Mastermind 45025 points

    Hi Deniz Kocak,

    There is an example of how to do this in the evmOMAPL138 hello world example (this is an NDK example).

    What the example does is, based on a #define, it either reads the MAC address from FLASH, else it uses one that's defined in the project.

    Please see the file "emacHooks.c" in the attached.  Look for the "#ifdef BSL" and corresponding "#endif" for the MAC address code.

    Steve

    0753.ndk_evm6748_bios6_helloWorld.zip

  • 0 in reply to Steven Connell
    Prodigy 220 points

    Hi Steven,

    Thanks for your reply. However, I could not understand the way I should follow. The example you refer is based in OMAPL138 and I saw differences between its driver level code and pdk 6678 code. Let me explain;

    In the example you sent, implementing EMAC_getConfig is enough I think. But I could not understand one thing.

    NC_NetStart triggers the NIMUInit which are defined in NDK source code. Then NIMUInit calls EMAC_Init which query the MAC address and set it. However in different file there are differences.

    \nsp_1_00_00_09\packages\ti\drv\omapl138\nimu_eth.c 

    In this file EMacInit calls HwPktInit() which is defined in ethdriver.c file. Inside the HwPktInit() function the method EMAC_getConfig(bMacAddr) is called as you suggest to put MAC address in it.It's OK.

    However in pdk...

    pdk_C6678_1_0_0_16\packages\ti\transport\ndk\nimu\src\nimu_eth.c

    EmacInit  calls  EMACInit_Core and unfortunately I could not see a similar callback mechanism to overwrite the MAC address. No HwPktInit defines/called here. Therefore no EMAC_getConfig or something similar. It just call platform_get_emac_info (i, &emac_info); and read the MAC address from evm, then set it. What can I do here?

     

    May be I missed something while reading documentation/code. Would you elaborate your answer?

     

    Regards