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The DDR data rate must be set correctly in the DDRIOCTRL register according to the Actual Clock Frequency (ACF) value. By enabling the reading of ACF value from bit 18 of the boot scratch register during initialization, the DDR data rate is able to be configured accurately. Signed-off-by: Alif Zakuan Yuslaimi <alif.zakuan.yuslaimi@altera.com> Reviewed-by: Tien Fong Chee <tien.fong.chee@altera.com>