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CONFIG_MTD_UBI_BEB_RESERVE: Percentage of reserved eraseblocks for bad eraseblocks handling

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The Linux kernel configuration item CONFIG_MTD_UBI_BEB_RESERVE:

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If the MTD device admits of bad eraseblocks (e.g. NAND flash), UBI reserves some amount of physical eraseblocks to handle new bad eraseblocks. For example, if a flash physical eraseblock becomes bad, UBI uses these reserved physical eraseblocks to relocate the bad one. This option specifies how many physical eraseblocks will be reserved for bad eraseblock handling (percents of total number of good flash eraseblocks). If the underlying flash does not admit of bad eraseblocks (e.g. NOR flash), this value is ignored and nothing is reserved. Leave the default value if unsure.

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