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* vmeUniverse/README.porting, vmeUniverse/README.universe:
updated, added more information for BSP implementors.
* vmeUniverse/VMEDMA.h (added): VME DMA API definition.
* vmeUniverse/bspVmeDmaList.h (added), vmeUniverse/bspVmeDmaListP.h (added),
* vmeUniverse/bspVmeDmaList.c (added):
Driver-independent code for linked-list DMA (public + private headers,
implementation).
* vmeUniverse/vmeUniverseDMA.h (added), vmeUniverse/vmeTsi148DMA.h (added):
interface to new DMA features of drivers.
* vmeUniverse/vme_amd_defs.h: Added definition for data-width
hint bits (VME_MODE_DBWxx).
* vmeUniverse/vmeTsi148.c: added DMA support. Added support for
data-width hint/modifier bits.
* vmeUniverse/vmeUniverse.c, vmeUniverse/vmeUniverse.h:
Added support for data-width hint/modifier bits.
Added support for xxx_BLT, xxx_MBLT address modifiers.
Restrict DBW to 32 in non-MBLT modes (except single-beat;
a comment is in README.universe). Updated DMA support to
implement new VMEDMA.h API. Added support for non-incrementing
VME addresses. Restrict data width to 32 for single-beat AMs
when the universe would use MBLT for DMA.
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