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A number of NAND flashes have a capability called "on-die ECC" where the NAND chip itself is capable of detecting and correcting errors. Linux already has support for using the ECC implementation of the NAND controller, or a software based ECC implementation, but not for using the ECC implementation of the NAND controller. However, such an implementation is sometimes useful in situations where the NAND controller provides ECC algorithms that are not strong enough for the NAND chip used on the system. A typical case is a NAND chip that requires a 4-bit ECC, while the NAND controller only provides a 1-bit ECC algorithm. This commit introduces the support for the NAND_ECC_ON_DIE ECC mode: - Parsing of the "on-die" value for the "nand-ecc-mode" Device Tree property - Handling NAND_ECC_ON_DIE case in nand_scan_tail(). The idea is that the vendor specific code for the NAND chip must implement ->read_page() and ->write_page(). It may optionally provide its own ->read_page_raw() and ->write_page_raw() as well. For OOB operation, we assume the standard operations are good enough, but they can be overridden by the vendor specific code if needed. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Reviewed-by: Richard Weinberger <richard@nod.at> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.