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For instance with VBCC or GCC, append -DDISABLE_DMA_RTG to the command line arguments.

Unchanged for non-DMA, because I've had enough of this for now.

SetPanning and SetSplitPosition need to update BoardInfo/RTGBoard members X/Y offset and Y split for mouse cursor coordinates to not wrap around.

Optional dummy read to attempt tricking the 68k data cache with systems that have misconfigured MMU tables.

remove hardwired path. add support to override SYSINC and SYSLIB location from external buildscripts

This value seems to work unreliably and, according to a reliable source, it should be fine to just ignore it.

Also requires the WIP changes from the branch over at firmware.

Also remove a few lines of unused code and don't send src_pitch, since it's always 16 pixels for BlitPattern.