Created attachment 125265 [details]
DMESG with pci_msi=off nouveau.config=NvForcePost=1 nouveau.debug=trace

Asus Z77 and GTX970, it seems the first fifo caused by
https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/nouveau/nvkm/subdev/secboot/base.c#L142

changing the value to 0x0 allowed the machine to boot, still with lots of
errors.