Arm Design And Implementation Of The Wearable Computer Bootloader

In modern logistic area, warehouse operation is the crucial link of logistic management process. Therefore, using new IT products to improve the efficiency of warehouse management is becoming an effective avenue to cut down on the cost, increase satisfactory degree of custom and enhance enterprise's competition strength. For this purpose, the Mobile Computer Centre of UESTC have developed Arm Type Wearable Computer (ATWC) independently, which release the user's hand from long time holding by being worn on arm during warehouse management course. With multi-channel sensor and wireless network technical and integrate with calculation function, ATWC can help users enhance work efficiency and better understand the outside environment.Since Bootloader, which executed after startup, is the first program of ATWC system, research and development of it is indispensability for implementation of ATWC. In this project, the design of Bootloader is meet not only the common functional requirement of embedded system, but also some special requirement for ATWC such as low-power.This dissertation performed the proposition and implementation of Bootloader for ATWC. Author's major research work in this area is summarized as follow:1. After analyzing the functional demands of ATWC and study the principles and framework of Bootloader, we select PXA270 embedded processor and embedded Linux operation system as development platform.2. Compared Nor-flash and SD card scheme, considered from the speed of start-up and feasibility of ATWC, we finally take Nor-flash scheme as the load strategy. Propose the Nor-flash drive based on the traits of ATWC, the drive implement the command of erasing, writing and reading as well. Above this, keep the kernel of Linux and file system into Nor-flash.3. Propose and implement three modules: start-up and loading module, adjust and interaction module, download and update module. Compared with open source Bootloader, our Bootloader have some advantage. for example quicktime boot-loader and mini target code.The Bootloader of this thesis also could transplant to other wearable computers or embedded devices which base on ARM-Linux platform.