In the latest Rev F data sheet for the ADuC702x GP3PAR is not documented but is mentioned here.. ez.analog.com/message/74631. It is in Keil header files. It appears to have default value of 0x00222222.
Information in Table 84 (GPxPAR) seems to contradict info in ez.analog.com/thread/3960 which says "Note that the drive strength is only configurable on the following port pins: P0.7, P3[5-0]". Table 84 shows P0[7-5] & P1[7-6] as configurable. Could you please clarify.