[patch][rfa] SID mapper component enhancement

[Dave Brolley]

Hi,

The attached patch enhances the syntax accepted when defining mappings
in the hw-mapper-basic and hw-mapper-transparent components to allow the
specification of a base address for the mapped memory. Currently, the
default mapped base address for hw-mapper-basic is zero and for
hw-mapper-transparent it is the same as the starting address of the
range. The mapped base address is specified using <base>= within the
range specification as follows:

    [<base>=<start>-<end>]

wordsize and stride/width are also still accepted:

    [<wordsize>*<base>=<start-end>,stride,width]

This patch does not change the behavior of existing specifications.

The SID mapper tests pass with no regressions as does xstormy16-allinsn.exp. Also tested against an internal port which inspired this enhancement.

Ok to commit?

Dave

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