Right now we designed a i.MX6 Solo board with a Wifi Module (RTL8189es) wired to the SD2 bus. However, we did not know which SD2_CD_B pin should be used and our module does not require that pin either. In that case, we let NANDF_D2 (used in the SABRESD EVB) and GPIO_4 (listed in the reference manual) float. Later on we discovered that there is an error message output "uSDHC1: No card-detect pin available!" message on the boot log output. In addition, the system seems to have to problem to recognize there is a Wifi module plugged into SD2 bus. Is there anyway we could fix this by letting the system know the module is plugged in the software? Any help is greatly appreciated! We are running Android 4.0.4 on a board similar to i.MX6 Sabresd EVB.