mtd: atmel_nand: optimize read/write buffer functions
For PIO NAND access functions, we use the features of the SMC: - no need to take into account the NAND bus width: SMC will deal with this - use of an IO memcpy on the NAND chip-select space is able to generate proper SMC behavior. Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: NArtem Bityutskiy <dedekind1@gmail.com>
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