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dt-bindings: mtd: gpmc: Fix the ECC bytes vs. OOB bytes equation

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"PAGESIZE / 512" is the number of ECC chunks.
"ECC_BYTES" is the number of bytes needed to store a single ECC code.
"2" is the space reserved by the bad block marker.

"2 + (PAGESIZE / 512) * ECC_BYTES" should of course be lower or equal
than the total number of OOB bytes, otherwise it won't fit.

Fix the equation by substituting s/>=/<=/.

Suggested-by: Ryan J. Barnett <ryan.barnett@collins.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/linux-mtd/20210610143945.3504781-1-miquel.raynal@bootlin.com
This commit is contained in:
Miquel Raynal 2021-06-10 16:39:45 +02:00
parent e73f0f0ee7
commit 778cb8e39f
1 changed files with 1 additions and 1 deletions
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Documentation/devicetree/bindings/mtd/gpmc-nand.txt
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@ -122,7 +122,7 @@ on various other factors also like;
so the device should have enough free bytes available its OOB/Spare so the device should have enough free bytes available its OOB/Spare
area to accommodate ECC for entire page. In general following expression area to accommodate ECC for entire page. In general following expression
helps in determining if given device can accommodate ECC syndrome: helps in determining if given device can accommodate ECC syndrome:
"2 + (PAGESIZE / 512) * ECC_BYTES" >= OOBSIZE" "2 + (PAGESIZE / 512) * ECC_BYTES" <= OOBSIZE"
where where
OOBSIZE number of bytes in OOB/spare area OOBSIZE number of bytes in OOB/spare area
PAGESIZE number of bytes in main-area of device page PAGESIZE number of bytes in main-area of device page