mirror of
https://github.com/apache/nuttx.git
synced 2026-08-01 20:28:58 +00:00
0c287d6f45
Use the chip's built-in 20-entry non-volatile Bad Block Management Look-Up Table (datasheet section 8.2.7) to transparently route around bad blocks. Init: - Reserve the top 24 blocks of the array as a spare pool - Clamp the MTD geometry to W25N_USER_BLOCKS = 1000 so upper layers never see the spare area (125 MB usable instead of 128 MB) - Force BUF=1 alongside enabling ECC. The W25N01GVxxIT variant power-ups with BUF=0 (Continuous Read mode), in which Read Data ignores the column address and always starts at byte 0 - which silently broke any read targeting a non-zero column (OOB markers, sub-page reads in w25n_read). - Scan all 1024 blocks for factory bad markers (non-FFh at byte 0 of the spare area of page 0) and remap any user-area bad blocks via the A1h BBM command. Idempotent across reboots: blocks already present in the LUT are skipped, so repeated scans don't consume LUT slots. Runtime: - On E-FAIL from w25n_block_erase or P-FAIL from w25n_program_execute, allocate a spare and issue A1h, then retry the operation once. The chip routes the retry to the spare PBA transparently. Data buffer is reloaded on program retry. - Uncorrectable read ECC is left as -EIO (soft errors shouldn't trigger permanent remap, and remapping discards data we may still recover). Safeguards against burning LUT slots on bogus bad blocks: - w25n_pick_free_spare erases each candidate spare as an active proof of life before returning it - the factory OOB marker alone isn't trusted. - w25n_bbm_swap rejects A1h with LBA outside the user area or PBA outside the spare pool. Stack discipline for the logger-thread hot path: - The 20-entry cached LUT lives in the device struct, not on the stack. - w25n_read_bbm_lut decodes 4 bytes at a time instead of reading the full 80-byte LUT dump into a local buffer. Boot diagnostics are emitted via syslog so they appear unconditionally: - [w25n] BBM scan summary (new/remapped/unremapped/previously-remapped/ LUT slots used) - [w25n] W25N01GV ready line with user blocks, spare count, geometry, and actual SPI frequency - [w25n] per-remap info and warnings on runtime E-FAIL/P-FAIL paths Note: existing littlefs filesystems become unmountable because the block count shrinks from 1024 to 1000; both PX4 board init.c paths already mount with autoformat so they reformat on first boot after this change. Signed-off-by: Julian Oes <julian@oes.ch> |
||
|---|---|---|
| .. | ||
| 1wire | ||
| aie | ||
| analog | ||
| audio | ||
| bch | ||
| can | ||
| clk | ||
| contactless | ||
| coresight | ||
| crypto | ||
| devicetree | ||
| dma | ||
| dummy | ||
| eeprom | ||
| efuse | ||
| i2c | ||
| i2s | ||
| i3c | ||
| input | ||
| ioexpander | ||
| ipcc | ||
| lcd | ||
| leds | ||
| loop | ||
| math | ||
| misc | ||
| mmcsd | ||
| modem | ||
| motor | ||
| mtd | ||
| net | ||
| note | ||
| pci | ||
| pinctrl | ||
| pipes | ||
| power | ||
| rc | ||
| regmap | ||
| reset | ||
| rf | ||
| rpmsg | ||
| rptun | ||
| segger | ||
| sensors | ||
| serial | ||
| spi | ||
| syslog | ||
| thermal | ||
| timers | ||
| usbdev | ||
| usbhost | ||
| usbmisc | ||
| usbmonitor | ||
| usrsock | ||
| vhost | ||
| video | ||
| virtio | ||
| wireless | ||
| .gitignore | ||
| CMakeLists.txt | ||
| drivers_initialize.c | ||
| Kconfig | ||
| Makefile | ||