flash管理算法实现，几乎原创，实现了坏块管理，静态动态均衡。优化度不是很高，作为ftl算法入门还不错，优化后能实现所有的flash使用管理。里面主要是为了spi-flash而设计。-flash management algorithm, almost original, realized the bad block management, static and dynamic balance. Optimization is not very high, as a good entry ft