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- #LINUX NETWORK DRIVER INSTALL#
- #LINUX NETWORK DRIVER DRIVER#
- #LINUX NETWORK DRIVER FULL#
- #LINUX NETWORK DRIVER DOWNLOAD#
#LINUX NETWORK DRIVER DRIVER#
During initialization of the Etherent Device the Device driver queues up enoudh empty packet buffers so as to fill this queue. The head pointer is maintained by the Device driver and the tail pointer is maintained by the Ethernet Device. The queue contains two pointers contained in the register of the Etherent Device. This queue contains the descriptors representing the Empty Ethernet buffers onto which the hardware can put the received ethernet data. The Device Drivr ISR function looks at the Tx Done Descriptors one by one using the Tail pointer and releases the socket buffers used by these packets. It then raises a Transmit Done interrupt. When a packet represented by the Transmit Descriptor in the Tx Descriptor Queue is successfully sent on wire by the Ethernet Device, it constructs a Tx Done Descriptor and puts it in the Tx Done Descriptor Queue in the place pointed to by the Head Pointer. The queue contains two pointers contained in the register of the Ethernet Device, the Head Pointer maintainted by the Ethernet Device and the tail pointer maintainted by the Device Driver. This queue contains the descriptors representing the Ethernet Frames that have been sent by the hardware. It then retrieves the descriptor pointed to by the Tail Pointer, retrieves the packet from the Tx Descriptor and sends it on the wire. The Transmit side of the Ethernet hardware continuously looks for presense of any packets to transmit as indicated by Head Pointer register not equal to Tail Pointer register. When the Device driver wants to transmit a frame, it constructs a Transmit Descriptor and puts it in the place pointed to by the Head Pointer register and updates the Head Pointer register by one.
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The queue contains two pointers contained in the register of the Ethernet Device, the Head pointer maintained by the Device Driver, the tail pointer maintained by the Ethernet Device. This queue contains the descriptors representing the Ethernet frames that must be transmitted out by the hardware. The h/w is notified of the presense of these queues by the driver when it programs the base address of these queues.
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The driver has to allocate memory for all the descriptors and the queues. These descriptors are maintained in their appropriate fixed size queues. There are 4 kinds of descriptors, 2 types on the transmit side and 2 on the receive side. The Ethernet packets are represented by Descriptors which contain information about the packet size and exact memory location where the packet data is present. The Ethernet Device has an external PHY connected through the MII & MDIO interface. We will now model a psuedo Ethernet device. You will see TCP client establishing connection with the TCP server and sending packets. Start the Qemu, and run the /bin/tcp_client.out. Open a TCP server example application on your host PC.
#LINUX NETWORK DRIVER INSTALL#
If you are using Ubuntu machine, the following command will install the toolchain.Īrm-linux-gnueabi-gcc -g -Wall -g -o tcp_client. We use Linaro arm tool chain for cross compilation. Since we are using ARM Verstatile Express as the base platform, we need to cross compile the linux sources & busybox utility using arm-gcc compiler. Since our intention is to showcase simulation of Ethernet Device and the associated Device driver in Linux, we will make use of a widely used platform " ARM Versatile Express" as the base and Linux Kernel 3.2 built for this platform. This article makes use of Qemu which is an open source machine emulator.
#LINUX NETWORK DRIVER FULL#
A simulated Ethernet Device as well as the corresponding Ethernet Linux driver are developed from scratch to showcase the ease with which a full system can be simulated with Qemu. We will then run Linux Operating system on this virtualized machine. In this article we develop an ARM based system with a pseudo Ethernet device connected to an ARM-A9 processor on AXI bus. Qemu is a very powerful platform for hw/sw codesign and development.
#LINUX NETWORK DRIVER DOWNLOAD#
Download tcp_client_server.zip - 1.9 KB.