Implementation Of Led Driver For Commercial Applications Based On Arm 9

In Real time development 32-bit CPU’s which are widely used satisfies high speed processing, but they need a platform which makes it to run systems steadily and speedily. Stability and security plays an important role in embedded field. Based on the price, architecture and security Linux is one platform which plays an important role in embedded applications .The new version kernel has more benefits which are useful for embedded applications. Since Linux is open source we can get it easily and also the modified features in scheduling makes it more useful in embedded applications. This paper mainly concentrates on the boot-loader which is useful for system startup and loading of the system software’s which defines the operating procedures of the target platform before the operating system kernel is run. Its only task is to initialize the hardware and software environment into an appropriate state.In this paper we are using S3C2440 ARM9 high performance processor. Early embedded applications are simple in order to achieve only some specific operations, such as specialized applications like industrial control. Since these are simple applications so there was no need of operating system. But as the applications complexity increased and functions became more complex, and the over all system performance also needed to be managed, so these simple applications became insufficient. And, the need to choose an embedded operating system becomes an inevitable trend. But Linux was originally developed as an Operating System for desktop computers, and the OS to be used in embedded systems will have some differences. So we need to transform Linux into Embedded Linux. Since it is the embedded operating system, we need to use Cross compiler to CROSS_COMPILE Linux source code according to the target. Before compiling we have to configure the source code according to the target board configuration. On completion of successful compilation we will get the Embedded Linux Kernel. Then we need to transfer the kernel Image to the target board. In Embedded Linux, the application program doesn’t have direct access to the devices attached to the target board. We need to use Device Drivers. So we will be making one device driver to control an LED according to our application