Every chip vendor I've dealt with, from Amlogic to Allwinner to Freescale, requires a signed NDA for full documentation. Public documentation is usually heavily redacted.
The GR8 seems to be a rebadged Allwinner chip, and the no-NDA datasheet seems to be next to useless, to be honest.
The GR8 seems to be a rebadged Allwinner chip, and the no-NDA datasheet seems to be next to useless, to be honest.