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The Arm SSE-200 Subsystem for Embedded is a revised and extended version of the older IoTKit SoC. Prepare for adding a model of it by refactoring the IoTKit code into an abstract base class which contains the functionality, driven by a class data block specific to each subclass. (This is the same approach used by the existing bcm283x SoC family implementation.) Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20190121185118.18550-6-peter.maydell@linaro.org