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SDX55 uses QPIC version 2.0.0 IP for the NAND controller support. In this version, DEV_CMD_* registers are moved to operational state, hence CPU access in BAM mode is restricted. So, skip accessing these registers and also use a different config for reading ONFI parameters. Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20201126085705.48399-3-manivannan.sadhasivam@linaro.org