From section 8.1 (Pin Descriptions Overview) of the i.MX28 Reference Manual :
"Almost all digital pins are powered down (that is, high impedance)
or configured as GPIO input at reset, until reprogrammed. The only
exceptions are TEST PINS(TESTMODE, DEBUG, JTAG pins). These pins
are always active."
From section 8.1 (Pin Descriptions Overview) of the i.MX28 Reference Manual :
"Almost all digital pins are powered down (that is, high impedance)
or configured as GPIO input at reset, until reprogrammed. The only
exceptions are TEST PINS(TESTMODE, DEBUG, JTAG pins). These pins
are always active."