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Mainline Linux tree for various devices, only for fun :)
2301780711
The MT29F2Gxxx chips with 4bits/512byte on-die ECC let us know when some bitflips were corrected by the on-die ECC, but they do not report the actual number of bitflips that were present in the data+ECC chunk. We initially decided to always return ecc->strength to avoid re-reading the page in raw mode + comparing it to the corrected buffer to extract the real number of bitflips, but this forces UBI to move data around as soon as one bitflip is present in a page. This not only wears the NAND out faster, but also degrades performances, since reading a full PEB + writing it back to a different PEB + erasing the old one is much more expensive than re-reading the faulty page in raw mode and comparing it to the corrected buffer. In most cases, the actual number of bitflips does not exceed the bitflips threshold, and UBI won't have to move data around. Otherwise, we can assume the time spent re-reading the page and doing the comparison is negligible compared to the time UBI spends moving a full PEB to another PEB. Note that this logic is not applied to chips with 8bits/512byte on-die ECC, because those chips provide fine-grained information (the maximum error is 1 bit, and it will not force UBI to move blocks around at the first bitflip). Suggested-by: Bean Huo <beanhuo@micron.com> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> |
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| .get_maintainer.ignore | ||
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.