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Project1Sept14 - NEXOS1 Project#1 Booting up and...

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1 NEXOS 1 Project #1 – Booting up and Interacting with Embedded XINU Operating System CSE321: Embedded and Realtime Operating Systems Fall 2011 Due date: 10/1/2011 (you need to demo it by then by attending recitations) 1. Objectives and overview of the project: Prepare a simple hardware system and embed in it a minimal operating system. The minimal operating system will be enhanced in the subsequent projects by other features. We will use WRT54GL the wireless router from Linksys [1] and Embedded XINU operating system [2] for this purpose. Students will 1. Study the architecture of WRT54GL wireless router. 2. Test the embedded operating system using simple C programs. 3. Modify the EXINU code to add new shell commands. 4. Study the software representing various components of the Embedded XINU operating system 5. Study the serial port features (UART0 and UART1) offered by XINU/WRT54GL platform 6. Establish a communication channel between devices connected to these ports via a cyclic executive loop 7. Build a simple chat application with user login feature and realtime constraints. 2. Project Environment 2.1 Operating system XINU XINU ("Xinu Is Not Unix") is a small, academic operating system developed at Purdue University by Dr. Douglas E. Comer in the early 1980s for the LSI-11 platform; it has now been ported to a variety of platforms. Embedded XINU is an update of this project which attempts to modernize the code base (to ANSI-compliant C) and port the system to a modern architecture (specifically the MIPS architecture). 2.2 Hardware WRT54GL We will use wireless router WRT54GL as a host for the software we will develop for enhancing the features of an embedded operating system. WRT54GL has a very interesting history the details of which can be found at [3]. The WRT54G is notable for being the first consumer-level network device that had its firmware source code released to satisfy the obligations of the GNU GPL. This allows programmers to modify the firmware to change or add functionality to the device. WRT54GL features a Broadcom MIPS processor BCM5352 (200-250Mhz), a four port Ethernet switch, 802.11b and 802.11g wireless LAN support, a Web interface for configuration of the router, 16Mbytes of SDRAM and 4Mbytes of flash memory. Any modification to the router function itself has to be done by updating the firmware on the flash memory. However we will load the embedded XINU image that we create in the SDRAM. See [4] more details on the memory layout of the SDRAM.
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