Support to use ELM as BCH 4 & 8 bit error correction module. Also performance enhancement by adding single shot read_page and write_page functions for the nand flashes with page size less than 4 KB. ELM module can be used to correct errors reported by BCH 4, 8 & 16 bit ECC scheme. For now only 4 & 8 bit support is added. BCH 4 & 8 bit error detection support is already available in mainline kernel and works with software error correction. This series is based on linux 3.8-rc2 and tested with [1]. Also this patch series depend on [1] for NAND flash device tree data and gpmc nand device tree binding documentation updates. 1. [PATCH v7 0/5] OMAP GPMC DT bindings http://www.spinics.net/lists/linux-omap/msg83505.html Tested on am335x-evm for BCH 4 and 8 bit error correction. Changes since v1: - Erased page is identified by checking byte [13/7] in read ecc. To filter out bit flips in OOB area, check 0 bits in the byte greater than 4. - GPMC ecc engine configuration moves to omap2.c NAND driver. Changes since v2: - Added runtime detection of elm module, instead of depending on platform data. - Added bit flip correction in OOB ecc data if bit flip happen OOB data. Changes since v3: - Availability and usability of ELM module is detected from device tree nodes by checking availability of ELM node in device tree. Philip Avinash (3): mtd: nand: omap2: Update nerrors using ecc.strength mtd: devices: elm: Add support for ELM error correction mtd: nand: omap2: Support for hardware BCH error correction. Documentation/devicetree/bindings/mtd/elm.txt | 16 + .../devicetree/bindings/mtd/gpmc-nand.txt | 4 + drivers/mtd/devices/Makefile | 4 +- drivers/mtd/devices/elm.c | 405 ++++++++++++++ drivers/mtd/nand/omap2.c | 583 ++++++++++++++++++-- include/linux/platform_data/elm.h | 54 ++ 6 files changed, 1023 insertions(+), 43 deletions(-) create mode 100644 Documentation/devicetree/bindings/mtd/elm.txt create mode 100644 drivers/mtd/devices/elm.c create mode 100644 include/linux/platform_data/elm.h -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
