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关于5509a的串行二次引导程序



本人通过在串行SPI EEPROM的模式下实现了bootloader,但是加载速度比较慢,看了一些文档后决定进行二次加载,网上资料一般都是并行方式的二次加载,而且都是通过汇编程序实现,不知道在哪有5509a内部固化的bootloader程序,以及如何自己编写的二次引导程序实现,求帮助!!