GEMAC example code at "xgemac_example.h" in version" f" of this driver uses a character array to define a buffer. This works for transmit buffers since this device uses DRE on that channel, but receive buffers may be misaligned and cause invalid data to be received.
Fixed frame alignment for Rx frames.
This problem is fixed in the latest 6.3 EDK Service Pack, available at:
The first service pack containing the fix is EDK 6.3 Service Pack 2.