This is only used for the loader code, so you can get a bootloader into
the phone without JTAG and using osmocon. In other words, UART support only.
The kernel for MTK does not seem to have any signs of
gsm layer 1 code.
All known info is here:
http://bb.osmocom.org/trac/wiki/MT6235_DSP
Once more is known, layer1 could be implemented.
Regards,
Wolfram