June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Clean markers
An erased block with all bits set to 1 is indistinguishable from a block that has been written with 1's, but the latter has not had its memory cells refreshed and cannot be programmed again until it is erased. JFFS2 uses a mechanism called clean markers to distinguish between these two situations. After a successful block erase, a clean marker is written, either to the beginning of the block or to the OOB area of the first page of the block. If the clean marker exists, then it must be a clean block.
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