I am now in the process of compiling the new TTM memory allocator code for OpenChrome DRM.  I hope to test the code for the first time by tomorrow.  Again, I plan to reuse the code with the future DRM modernization project (i.e., adding Kernel Mode Setting or KMS support) for underserved PCI / AGP graphics devices.  That project has stalled for now pending the validation of TTM memory allocator code.  It will resume once the code is proven.  Things are pretty much going along the lines described in my XDC 2017 OpenChrome Project presentation, except the schedule.