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# Ancillary NAND utilities

The following utilities are included with the NAND library. They are standalone eCos applications; for convenience, you can set `CYGBLD_IO_NAND_BUILD_UTILS` in your eCos configuration and they will be built and placed into `install/tests/io/nand/current/utils`.

erasenand.c

  Loops over all the blocks of a partition, erasing all the blocks which are not marked as bad. The device and partition to erase are set by #define.

  > Note: This will not normally erase the Bad Block Table. This is because the BBT reports its own blocks as "Reserved" when queried via `cyg_nand_bbt_query`, which makes them inaccessible to applications. However, if `CYGSEM_IO_NAND_USE_BBT` is turned off, then any BBT present will not be detected and hence will be erased.

erase_bbt_dangerous.c

  Erases the NAND blocks comprising the primary and mirror bad-block tables of a device. The device to erase is set by #define. (The tables are detected by the library in the usual way. If none are present, the library will scan the device for factory-bad blocks to create such a table, then this code will immediately erase it.)

  Warning
  It is particularly dangerous to run this utility on a production device, as it is generally not possible to later reconstruct the list of factory-bad blocks. It is intended only as an aid to driver authors.

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