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AM6442: AM64x SD boot from MMC1 if SDCD pin is not connected

Part Number: AM6442

Dear Sir, 

Customer target board use MMC1 to boot SD card without connecting SDCD pin (SDCD is floating). 

SD clock cannot be measured during booting. 

Is SDCD pin a must pin to be checked by ROM CODE during SD/MMC boot on AM64x?  

BR, Rich