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spi flash 加载速度为什么很慢

板子是自己做的板子,通过i2c,二次加载实现了spi八核加载,但是加载很慢,从复位到加载成功大概要20秒,每个核的程序一样,每个核生成的table文件大概有400k左右,合并后有3兆dat文件,实际烧入flash大概有1m多byte。

怎么才能提高加载速度,是不是配置主pll,请问怎么配置,谢谢