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Add fw_cfg DMA interface specification in the documentation. Based on Gerd Hoffman's initial implementation. Signed-off-by: Marc Marí <markmb@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>