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In legacy method, 1st stage bootloader was used to configure the HW setting such as NAND timing. Hence, adding a config option in Zynq NAND driver for the compatibility of device that using 1st stage bootloder instead of U-boot SPL. This commit is to add config option CONFIG_NAND_ZYNQ_USE_BOOTLOADER1_TIMINGS that allow NAND driver use timing values set by the 1st stage bootloader, instead of the hard-coded values in the Zynq NAND driver. Signed-off-by: Jeff Westfahl <jeff.westfahl@ni.com> Signed-off-by: Wilson Lee <wilson.lee@ni.com> Cc: Joe Hershberger <joe.hershberger@ni.com> Cc: Keng Soon Cheah <keng.soon.cheah@ni.com> Cc: Chen Yee Chew <chen.yee.chew@ni.com> Cc: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com> Cc: Michal Simek <michal.simek@xilinx.com> Cc: Scott Wood <oss@buserror.net> Signed-off-by: Michal Simek <michal.simek@xilinx.com>