ELC + ABS

MLC and TLC NANDs are more and more common and almost inevitable for large capacity chips (> 2GB).
While this technology has been around for a couple of years now, it is only partially supported in the Linux kernel and is almost unusable in real products (for reliability concerns).
Supporting these chips implies not only reworking/extending the NAND framework (add scrambler support, implement read retry, ...), but also rework upper layers (UBI/UBIFS) to take MLC/TLC NANDs specificities into account (bitflip robustness, paired pages related issues, ...)

Through this talk, we would like to describe the MLC/TLC requirements, and talk about a few proposals to handle those requirements (these are either descriptions of existing submissions currently under review or recently merged, or just conceptual designs that would need further investigation).