【摘要】：TD-SCDMA和TD-LTE是當(dāng)今世界通信的兩大主流業(yè)務(wù),基站的可靠穩(wěn)定運(yùn)行是保障這兩大業(yè)務(wù)的根本。在基站的主控板卡上,用Flash芯片存儲(chǔ)著可執(zhí)行程序,對(duì)Flash的操作是基于TrueFFS這套文件系統(tǒng)的。在任務(wù)運(yùn)行期間,一些打印信息和告警信息都寫(xiě)入Flash芯片中。但是在系統(tǒng)運(yùn)行期間,會(huì)出現(xiàn)日志亂碼、自動(dòng)格式化等問(wèn)題。 針對(duì)上面出現(xiàn)的問(wèn)題,本人所做工作有以下幾方面： (1)學(xué)習(xí)并分析TrueFFS這套文件系統(tǒng)的源碼,找出了該套文件系統(tǒng)比較核心的翻譯層。對(duì)翻譯層中比較重要的塊分配、虛擬映射、頁(yè)表進(jìn)行重點(diǎn)分析。其中塊分配存放的是每個(gè)邏輯扇區(qū)的狀態(tài)和對(duì)應(yīng)的虛擬地址,虛擬映射存放的是虛擬扇區(qū)號(hào)和邏輯扇區(qū)號(hào)的對(duì)應(yīng)關(guān)系。 (2)定位外場(chǎng)反饋回來(lái)的問(wèn)題,提出改進(jìn)該套文件系統(tǒng)的方案。對(duì)于flash自動(dòng)格式化,這種現(xiàn)象發(fā)生在底層unit的頭部被改寫(xiě)之后。這種現(xiàn)象的發(fā)生說(shuō)明對(duì)unit頭部的保護(hù)不夠,增加對(duì)unit頭部的保護(hù)。文件系統(tǒng)出現(xiàn)讀寫(xiě)錯(cuò)誤,這說(shuō)明在尋址的時(shí)候出現(xiàn)了問(wèn)題。而和尋址有關(guān)系的是文件系統(tǒng)的塊分配和虛擬映射,增加對(duì)這些關(guān)鍵數(shù)據(jù)的備份,并在數(shù)據(jù)讀寫(xiě)時(shí)兼用主備份,以提高系統(tǒng)的可靠性。文件出現(xiàn)亂碼,這種情況是由位翻轉(zhuǎn)引起的。添加ECC校驗(yàn),使得系統(tǒng)具有自動(dòng)糾錯(cuò)的功能。 經(jīng)過(guò)改進(jìn)后的該套文件系統(tǒng)在測(cè)試中比較穩(wěn)定,沒(méi)有文件亂碼和自動(dòng)格式化的情況發(fā)生。在此期間也出現(xiàn)電平跳變的現(xiàn)象,但改進(jìn)后的文件系統(tǒng)對(duì)該種問(wèn)題進(jìn)行了報(bào)錯(cuò)與修復(fù)。
[Abstract]:TD-SCDMA and TD-LTE are the two mainstream services of communication in the world today, and the reliable and stable operation of base station is the foundation of ensuring these two services. On the main control card of the base station, the executable program is stored with Flash chip, and the operation of Flash is based on the file system of TrueFFS. During the operation of the task, some print information and alarm information are written into the Flash chip. However, during the operation of the system, there will be problems such as log scrambling, automatic formatting and so on. In view of the above problems, my work has the following aspects: (1) learn and analyze the source code of TrueFFS file system, find out the core translation layer of the file system. The important block allocation, virtual mapping and page table in translation layer are analyzed. Among them, the block allocation stores the state and the corresponding virtual address of each logical sector, and the virtual mapping stores the corresponding relationship between the virtual sector code and the logical sector code. (2) the problem of field feedback is located, and the scheme of improving the file system is put forward. For flash automatic formatting, this occurs after the header of the underlying unit is rewritten. The occurrence of this phenomenon shows that the protection of unit head is not enough and the protection of unit head is increased. A read and write error occurred on the file system, indicating that there was a problem with addressing. It is related to addressing that the block allocation and virtual mapping of the file system increase the backup of these key data and use the main backup when reading and writing the data in order to improve the reliability of the system. There is a random code in the file, which is caused by bit flipping. Add ECC check, make the system have the function of automatic error correction. The improved file system is stable in the test, and no file scrambling and automatic formatting occurs. During this period, there is also the phenomenon of level jump, but the improved file system reports and repairs this kind of problem.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類(lèi)號(hào)】：TP333;TP368.1

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