We would like to use GPIO of LS1021a. We have Freescale board LS1021a-TWR.
We tried to operate few pins of GPIO3 port by modification of RCW in u-boot. In spite modification external signals are not affected by PDAT register value and not all the bits of PDAT can be set high.
Then, this is the question: What GPIOs we can use without affecting basic LS1021a-TWR functionality like Linux shell over UART, networking and PCIe.