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CONFIG_MTD_UBI_FASTMAP: UBI Fastmap (Experimental feature)

General informations

The Linux kernel configuration item CONFIG_MTD_UBI_FASTMAP:

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Important: this feature is experimental so far and the on-flash format for fastmap may change in the next kernel versions

Fastmap is a mechanism which allows attaching an UBI device in nearly constant time. Instead of scanning the whole MTD device it only has to locate a checkpoint (called fastmap) on the device. The on-flash fastmap contains all information needed to attach the device. Using fastmap makes only sense on large devices where attaching by scanning takes long. UBI will not automatically install a fastmap on old images, but you can set the UBI module parameter fm_autoconvert to 1 if you want so. Please note that fastmap-enabled images are still usable with UBI implementations without fastmap support. On typical flash devices the whole fastmap fits into one PEB. UBI will reserve PEBs to hold two fastmaps.

If in doubt, say "N".

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