we want to use eim on imx6q-sabresd board to communicate with FPGA. But it is not supported on the board because it is not welded. If we want to weld it ourselves , do we need to do something else? some of EIM_DA is connected with boot configuration switch, does it make a conflict with EIM? And at last, how to configure EIM in os? it is introduced simply in the rm.pdf and useless, also not referred to ohter docs.