DocBook/drm: basic -> core

	  a GTT DRM MM object, which provides an address space pool for

	  object allocation.  In a KMS configuration, the driver

	  needs to allocate and initialize a command ring buffer following

	  basic GEM initialization.  Most UMA devices have a so-called

	  core GEM initialization.  Most UMA devices have a so-called

	  "stolen" memory region, which provides space for the initial

	  framebuffer and large, contiguous memory regions required by the

	  device.  This space is not typically managed by GEM, and must