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authorBoris Brezillon <boris.brezillon@collabora.com>2020-04-24 18:32:09 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-10-18 22:23:16 +0200
commit9fc8db29cf624b40cd2abeadc882eff8dd4ca65a (patch)
treed4b974901c5778163774598e2aaebf17709947a6 /tests/unittests/sysfs_mock/class/mtd/mtd0/dev
parentc4200760da8aaa1d3605007e14cda45c4abec501 (diff)
mtd-utils: Add nandflipbits tool
The nandflipbits tool is intended to be used when one need to flip one or several specific bits on a NAND media. It can be useful to manually recover from an unexpected bit flip on a flash device, though the main purpose of this tool is to provide a way to test ECC algorithms robustness. One typical example I used this tool for is testing HW ECC engines behavior when bitflips occur in an erased page: most HW engines do not correctly handle this case, because, most of the time, ECC bits generated for an empty page are not all 1s, and, empty page detection embedded in such engines is only validating that all bits are set to 1s (which is not true when a bit-flip has occurred). Another use of this tool is replacing nandbiterrs test which absolutely do not work with MLC-like chips because of the rewriting of the pages in raw mode to toggle ones into zeroes. Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com> [miquel: Took Boris' work from 2014, addressed comments from Brian made in 2015, updated it, tested more extensively and fixed issues] Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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