Refering to page no 6 in mb1191.pdf which is available as STM32F746G-discovery Kit schematic.
The pin diagram of following two Arduino connector was incorrect, this need correction as follows:
1. CN4 connector has ARD_D5 pin mentioned as PA8 -> this is incorrect.
ARD_D5 pin should be connected with PI0 as per rest of schematic.
2. CN7 connector has ARD_D10 pin mentioned as PI0 -> this is incorrect.
ARD_D10 pin should be connected with PA8 as per rest of schematic.
Please! do this correction urgently. Otherwise it will create a lot of confusion regarding the hardware design.