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SK-AM62: Enable ethloop for ethernet loopback test in u-boot

Part Number: SK-AM62

Hi,

I want to enable ethloop to do an ethernet loopback test. ethloop is not turned on by default in the configuration files. So I added #define CONFIG_CMD_ETHLOOP in /include/configs/<board.h>.

Then I rebuild the image and flashed to the board. The ethloop command is still not available in u-boot. 

Error: You must add new CONFIG options using Kconfig
The following new ad-hoc CONFIG options were detected:
CONFIG_CMD_ETHLOOP

I got this error when building uboot. It seems like there is no ethloop command in the Kconfig file. I am using the SDK 08.04.01.03 version. I tried the new SDK 08.06.00.43 and the problem is still there.

Thanks,

Chee