Serial port E in RCM5700

Serial port E (RCM5700) only works in the sample �ETHERNET_TO_SERIAL.C�, differences in the initialization of my projects and other samples in two variables:
// Select correct pins for serial port E output
#define SERE_TXPORT PEDR
#define SERE_RXPORT PEDR

When I declare them in other projects, serial port E not working. Please tell me how to initialize serial port E in RCM5700?

Thanks!