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）︰2014.04.15 上課時(14:20pm)公布考題, 2014.04.15 結束前(11:59pm)繳交 考試時限（分鐘）： 試題 : This is a take-home exam. Add more assumption 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 other file format of the same look. You can answer in Chinese or English. Please send your file back to [email protected] with a new filename of your ID by 11:59PM, April 15th. We will decide your order for project presentation (less than 30 minutes) in next class at 101 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 you first time burn u-boot on PXA270, why you need to copy twice? 2. [20%] In the homework, for the uC/OSII on DOS, if we run the resulting TEST.exe of exercise EX1_x86L 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 difference? 3. [20%] Suppose we would like to write a stopwatch application for Creator PXA270. It needs to support variable precision ranging from one millisecond to one second, so that the decimal point is not needed for one-second resolution. Given the kernel driver as Lab 3 that can display four decimal digits on the 4-digit 7-segment LED with a decimal point and some keypad buttons, please describe how to extend the driver to implement the stopwatch. No codes are needed. Your solution should be backward compatible, extendable, and as compact as possible. 4. [30%] A boot loader is a computer program that initializes the hardware platform and loads the operating system. However, it sometime might be desired to start the OS without using a boot loader for compact systems such as μC/OS. Please describe what should be done in the startup function of μC/OS-II when the kernel image resides in a NOR flash so that it is expected to be executed as in main memory directly without loading. Please elaborate on the advantages and disadvantages of using boot loader or not. Hint: relocation … 5. [20%] 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. --

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