Why do I see RTS and CTS signal in U-boot when using both UART0 and I2C1 on the same pin with Auto Flow control disabled on Cyclone® V SoCs?

Description

When using UART0 and I2C1 on Cyclone® V SoCs, you might observe that the msr.dcts register value changed in U-boot with Automatic Flow Control disabled in your Platform Designer system when reading or writing using I2C.

Resolution

The changed in msr.dcts register value can be safely ignored.