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The advantage of creating a VDK daughter board for an IP subsystem is the ability to immediately leverage the application processor subsystem of the CoreTile daughter board and ARM-based motherboard and begin embedded software development earlier with the readily available Linux and Android software images and build system. This way, daughter boards are highly reusable for different and future motherboards and can be even used as a subsystem for a custom SoC connecting to the specific interfaces of the SoC. Daughter boards have well-defined interfaces to the high speed memory bus, peripheral bus, configuration and system bus of the motherboard, so the developer isn’t burdened with having to know the deep details of these interfaces instead, the developer leverages an easy to use API that allows the connection to these interfaces. For example, the DesignWare ARC AS221BD processor daughter board for the ARM VDK is hosting a DesignWare SoundWave Audio Subsystem containing the ARC AS221BD dual core processor. Daughter boards can be of arbitrary complexity and host multiple processor cores and mix of DesignWare IP and/or any other TLM models. For this purpose, the Synopsys Virtualizer™ tool set provides graphical authoring tools and access to the DesignWare TLM Library. The user can even create custom daughter boards. As an example, the user is able to add additional I2C devices such as an accelerometer and attach them the DesignWare I2C controller. The user is also able to modify and extend all daughter boards. As shown in Figure 3, the user can select virtual boards from a library of ARM and Synopsys boards. The CoStart for VDK provides a GUI for the configuration of the VDK. In the remaining article we will describe the details and use cases for DesignWare daughter boards. However, instead of providing FPGAs, models of the DesignWare TLM Library are hosted on the daughter boards. The virtual daughter boards for Synopsys' DesignWare IP provide the same interfaces as LogicTiles. LogicTiles are daughter boards with different sized FPGAs. In real hardware this is done through so called “LogicTiles”. The virtual daughter boards for Synopsys' DesignWare IP plug into the virtual Motherboard Express ♚TX using the custom logic expansion capability of the Versatile Express system. The virtual CoreTile Express daughter boards are used together with the virtual Motherboard Express ♚TX for prototyping with the Cortex™-A processors. The VDK’s virtual motherboard replicates all peripherals which are relevant for software development. It includes all the necessary peripherals to enable porting, developing, and validating operating systems and applications for new ARM processors.
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The Motherboard Express ♚TX has been defined by ARM to support future generations of ARM processors. Instead, the developer is looking for a working system that can be extended with the specific IP of interest in order to start immediate software development. Also, the developer does not want to be concerned with re-targeting the OS kernel to the specifics of this artificial system. In this case the developer does not want to be concerned with creating a baseline virtual prototype with an embedded processor, timers, interrupt controllers, interfaces - all of which are needed just to boot the Linux kernel.
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For example, a software developer may only need to focus on the development of the Linux driver and/or middleware revision of a mobile storage card. But very often, the scope of embedded software development is not targeting an entire SoC, but a collection of IP. Creating virtual prototypes at the granularity of a TLM is the right approach to enable SoC-specific software development. The building block of a virtual prototype is a TLM (Transaction Level Model) piece of IP. However, the step of creating a virtual prototype as a tool for earlier software development has been an uncomfortable hurdle. Their exceptional debugging capabilities, which are enabled through their high degree of control and visibility, are crucial to getting software up and running in a timely manner. Virtual prototypes are unique in their capability to enable software development before hardware is available.