Messages in this thread | | | From | Philip Avinash <> | Subject | [PATCH v4 0/3] mtd: nand: OMAP: ELM error correction support for BCH ecc | Date | Fri, 4 Jan 2013 13:26:48 +0530 |
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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
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