Loading microcode is essential because it controls FMAN internal RISCs. No correct operation at all is possible
if the microcode is not loaded. Microcodes are provided as binaries, they are part of QorIQ SDK. Unpack
the package named 'fm-ucode' to get the binaries. Refer to u-boot source code, file drivers/net/fm/fm.c, function
fman_upload_firmware() on how to upload the microcode.