Hi Nishit,
nVIDIA says that actually the device manufacturer is supposed to provide support, and not them. Unfortunately for us, the actual manufacturer is some company named Malata, while Notion Ink, Viewsonic etc. are just rebranders with not much technical expertise, and who may not be in a position to negotiate with nVIDIA, let alone Google.
Is Notion Ink willing to help? And is bootloader in Notion ink tablets unlocked?
Reason I ask is, I am working on similar problem for the Tablet that I have (Acer A500). If we have support from Notion Ink, I can help setup toolchain once I solve that problem for the tablet that I have.
-Shamit