Christopher Haster c2fab8fabb Added asserts on geometry and updated config documentation ...

littlefs had an unwritten assumption that the block device's program
size would be a multiple of the read size, and the block size would
be a multiple of the program size. This has already caused confusion
for users. Added a note and assert to catch unexpected geometries
early.

Also found that the prog/erase functions indicated they must return
LFS_ERR_CORRUPT to catch bad blocks. This is no longer true as errors
are found by CRC.

2018-01-11 11:56:09 -06:00

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