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All possible (five) Flash devices are supported with the programmer-
specific parameter spibus=<n>, along with a special setting spibus=host
to access the dedicated SPI controller (often used for the host BIOS).

Change-Id: I3d49c73b6f5da97af23cace89759923265c256dc
Signed-off-by: Timothy Pearson <tpearson@raptorengineering.com>