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학술지 Enhanced UBI Layer for Fast Boot-up Times of Mobile Consumer Devices
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저자
강동욱
발행일
201205
출처
IEEE Transactions on Consumer Electronics, v.58 no.2, pp.450-454
ISSN
0098-3063
출판사
IEEE
DOI
https://dx.doi.org/10.1109/TCE.2012.6227446
협약과제
11MS4500, 무인기용 표준 SW 솔루션 및 Test-bed 개발, 임채덕
초록
Due to its short mounting time, the Unsorted Block Image File System (UBIFS) allows mobile consumer devices to boot up faster than devices with other existing flash file systems. However, UBIFS requires a preceding UBI image attachment, which is not scalable. This due to the fact that two pages have to be read per erase block of the UBI image during mounting process, including an erase counter (EC) header and volume ID (VID) header. To lessen the effect of this problem, the UBI attachment process is modified. The EC header scan is delegated to a kernel thread after the booting process. And using software error-correcting code (ECC) instead of hardware ECC, latency from the VID header scan is lightened. As a result, although still not scalable, the mounting time is shortened considerably. In addition, the coefficient (rate of increase) becomes less significant. In experiments, the mounting time is under 1/8 of the normal time with a 100MB UBI Image. In addition, the rate of increase in the mounting time according to the UBI image size, i.e., the coefficient, is lessened from 8.9 to 0.5 milliseconds per byte. © 2012 IEEE.
키워드
fast booting, flash memory file systems, mobile consumer device, UBI, UBIFS
KSP 제안 키워드
Attachment process, Block image, Consumer devices, Error correcting code(ECC), File System, Flash Memory, Image files, fast boot, image size