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In Allwinner SoCs, user data can be added in OOB before each ECC data.
For older SoCs like A10, the user data size was the size of a register
(4 bytes) and was mandatory before each ECC step.
So, the A10 OOB Layout is:
[4Bytes USER_DATA_STEP0] [ECC_STEP0 bytes]
[4bytes USER_DATA_STEP1] [ECC_STEP1 bytes]
...
NB: the BBM is stored at the beginning of the USER_DATA_STEP0.
Now, for H6/H616 NAND flash controller, this user data can have a
different size for each step.
So, we are maximizing the user data length to use as many OOB bytes as
possible.
Fixes: 88fd4e4dea ("mtd: rawnand: sunxi: Add support for H616 nand controller")
Signed-off-by: Richard Genoud <richard.genoud@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>