The problem seems to be in the "pic_jtag_pcie.py" script. When running the "axiom-start.sh" it gives the following error:
===========================
+ ./pic_jtag_pcie.py 0x92 0x92
Traceback (most recent call last):
File "./pic_jtag_pcie.py", line 28, in <module>
jtag_tms(i2c, base, "01100") # goto Shift-IR
File "/opt/axiom-firmware/software/scripts/jtag.py", line 108, in jtag_tms
jtag_seq(i2c, base, [0x02, 0x02], data, mod, val)
File "/opt/axiom-firmware/software/scripts/jtag.py", line 70, in jtag_seq
i2c.write_i2c_block_data(last + 1, mod, [val])
OSError: [Errno 6] No such device or address
===========================
If I get the "pic_jtag_pcie.py" and "jtag.py" scripts from the 1.0 firmware, the HDMI works correctly.
I attach the diff from 1.0 vs 2.0 firmware.