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Many NAND devices use a build recipe with "append-ubi | check-size" to ensure factory images don't exceed the target flash partition size. However, UBI reserves space for bad block handling and other operational overhead, and thus 'check-size' can overestimate the space available by several MB. In practice, this means a failed check is definitely a failure, while a passing check is only probably a pass. Improve the situation by teaching 'Build/append-ubi' to check image sizes while accounting for UBI reserved blocks. Add new device variable NAND_SIZE and use with existing IMAGE_SIZE to derate the available space. Each UBI device reserves 20 PEBs per 1024 PEBs of the entire NAND device for bad blocks, plus an additional 4 PEBs overhead. Many devices can transparently enable this check by setting NAND_SIZE based on their flash storage, and may then remove any unneeded 'check-size'. Link: http://www.linux-mtd.infradead.org/doc/ubi.html#L_overhead Suggested-by: Shiji Yang <yangshiji66@qq.com> Suggested-by: Robert Marko <robimarko@gmail.com> Signed-off-by: Tony Ambardar <itugrok@yahoo.com>
