課程名稱︰嵌入式作業系統實作 課程性質︰選修 課程教師︰薛智文 開課學院：電資學院 開課系所︰資工所、網媒所 考試日期（年月日）︰2015.04.21 上課時(14:20pm)公布考題, 2015.04.22 中午前(11:59am)繳交 考試時限（分鐘）： 試題 : This is a take-home exam. Add more assumption for the questions if you need. Please do answer with your OWN SUCCINCT words after each question (keep the question) in this file in less than 5 pages of the same text font (Times New Roman 12). You can turn in with another file format of the similar look. You can answer in Chinese or English. Please send your file back to [email protected] with a new filename of your ID by April 22th 11:59AM. We will decide your order for project presentation (less than 20 minutes) in next class at 111 by that the earlier one with receive time of the last submission of this midterm in your group has higher priority. Have fun. 1. [10%] When we burn u-boot on PXA270, why we need to copy twice? 2. [20%] In homework, for the uC/OSII on DOS, if we run the given TEST.exe several instances simultaneously, the timer in each instance will have more and more difference as time goes by. Why and how do we fix this problem to shorten the time drift? 3. [30%] Suppose we would like to write a stopwatch (user) program on Creator PXA270 by the given driver as Lab 2. It needs to support variable precision ranging from one millisecond to one second, where the decimal point is not shown for one-second resolution. The driver does not support a decimal digit on the 4-digit 7-segment LED, please describe how the LED and keyboard button works, and how to extend the driver to implement the stopwatch. Your solution should be backward compatible, extendable (no secret of driver is revealed), compact and as accurate as possible. No codes are needed. The suggestion in class might not be correct. 4. [20%] uCOS is a real-time OS with O(1) scheduler, where the task with the highest priority can be identified at constant time. In addition to the ready "queue" for scheduling, the O(1) mechanism are also applied in other uCOS components. Please describe the disadvantages of the O(1) mechanism, and which components mentioned above can be released NOT to use the O(1) mechanism. 5. [15%] To implement an embedded system, we need to take care of software components in BSP (board support package), bootloader, OS, driver, tool chain, and the application. For Taiwan embedded software industry, which components are the most valuable you would like to explore? Why? Please give examples and describe how to accomplish the value you expect and how many man months it might take. 6. [5%] What is your job in your term project? What is the most valuable contribution of your term project in terms of the system problems to solve? --

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