How to change host device's MAC address used by NDK?

David,

See the post http://e2e.ti.com/support/dsp/c6000_multi-core_dsps/f/639/t/232017.aspx?pi239031349=1. Basically, the NIMU driver under C:\ti\pdk_C6678_1_1_2_6\packages\ti\transport\ndk\nimu\src\nimu_eth.c, the function EMACInit_Core, there is a call to platform_get_emac_info followed by memcpy(ptr_pvt_data->pdi.bMacAddr, emac_info.mac_address);. You can try changing emac_info.mac_address to a custom address of your choice, or change the platform function to fit your requirements. Remember to recompile both the library and your application using this library.

Regards, Eric

Hi Eric

Thanks for your reply.  I have also found the NIMU IOCTL commands, which I should be able to call from the application.  Something like:

        ret_code = NIMUIoctl (NIMU_GET_DEVICE_MAC, &if_req, &MacAddress, 6);

However, I'm having trouble finding the correct index value to assign to if_req.

Best regards

David 

David,

&if_req implies this value is returned by the function, not you assign a value to it.

Regards, Eric

Eric

I disagree, if_req is a structure, and so is passed to the function by a pointer.

NIMUIoctl returns (-22). Any idea what that value means please?

David

David,

I agree this is a structure actually.

C:\ti\ndk_2_22_02_16\packages\ti\ndk\inc\serrno.h (1 hits)
 Line 66: #define EINVAL          22      /* Invalid argument */

Regards, Eric

Hi Eric

Thanks for pointing out the error code description.

I need to enumerate the devices before attempting to set the MAC address.  I have done this, by adding the following code to:

"C:\ti\mcsdk_bios_3_00_00_11\examples\ndk\helloWorld\helloWorld.c"

NIMU_IF_REQ if_req;

UINT16 num_device;  

int ret_code;

[snip]

ret_code = NIMUIoctl (NIMU_GET_NUM_NIMU_OBJ, NULL, &num_device, sizeof(UINT16));

if (ret_code==0)

    printf("Number of NIMU objects:%d\n", num_device);

else   

    printf ("NIMUIOCTL Failed with error code: %d\n",ret_code);

This IOCTL call now succeeds, but it reports that the number of devices is 0.  Perhaps I am calling it before the NIMU is initialised but i don't know when that happens.

Any help would be appreciated.

BR

David