NAND is not good at handling absolute addresses to sectors for storing particular data. The current implementation of the NAND env support works around this in several ways such as storing a pointer to the sector in the OOB of the first sector (interferes with some CRC) or supporting a range of sectors (which unless it is huge is not guaranteed to be safe). None of these options address wear-leveling concerns or bad block handling.
Accessing the u-boot env from UBI eliminates these concerns. However, it does require some of the basic settings for finding the UBI env to be in the default u-boot env.
Changes in v3: - Added documentation for UBI and UBIFS to README - Changed the silence to opt-in and added the options to README - Added comment to README about using _SILENCE_MSG options
Changes in v2: - Fixed error handling bug that prevents fail-over to default env on error - Added curly braces on "multi-line" statements - Added extern consistently in header - Cleaned up the msg print silencing - Added curly braces on "multi-line" statements
Joe Hershberger (7): ubi: Fix broken cleanup code in attach_by_scanning ubi: Expose a few simple functions from the cmd_ubi ubi: ubifs: Add documentation for README ubi: ubifs: Turn off verbose prints mtd: Make mtdparts work with pre-reloc env env: Add support for UBI environment env: Add redundant env support to UBI env
README | 53 ++++++++++++ common/Makefile | 1 + common/cmd_mtdparts.c | 23 ++++- common/cmd_nvedit.c | 7 +- common/cmd_ubi.c | 153 ++++++++++++++++++--------------- common/env_ubi.c | 220 ++++++++++++++++++++++++++++++++++++++++++++++++ drivers/mtd/mtdpart.c | 14 +-- drivers/mtd/ubi/build.c | 8 +- drivers/mtd/ubi/ubi.h | 4 + drivers/mtd/ubi/wl.c | 1 + fs/ubifs/ubifs.h | 4 + include/environment.h | 18 ++++ include/ubi_uboot.h | 3 + tools/env/fw_env.c | 6 +- 14 files changed, 434 insertions(+), 81 deletions(-) create mode 100644 common/env_ubi.c