25 May '12, 12pm

LKS: #CDNS blog: Using Physical USB Devices with the @Xilinxinc Zynq-7000 Virtual Platform #ARM

LKS: #CDNS blog: Using Physical USB Devices with the @Xilinxinc Zynq-7000 Virtual Platform #ARM

There are two choices for how to handle USB devices in a virtual platform. A USB device can be modeled using C/C++ programming, or a physical USB device can be plugged into a computer and attached to the simulator. The Xilinx QEMU for Zynq uses physical USB devices. The Cadence SystemC Virtual Platform for Zynq uses either technique. One of the drawbacks I learned when using physical USB devices is the need for root permission to access the Linux device node from user space. This is required to open the driver and perform operations to control the USB device from an application. There are a couple of techniques I found when considering the best solution: Run the simulator as root Change owner of /proc/bus/usb All of this assumes you have root permission (or sudo capability) on your machine. First, I found that running QEMU as root is not too difficult; just put a sudo in f...

Full article: http://www.cadence.com/Community/blogs/sd/archive/2012/05...

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