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IOM的使用问题

最近在调试C6455,需要把非操作系统的东西转化为BIOS代码,对GIO和DVE有点不清楚,不知道是什么情况下使用DVE和GIO。

比如,我写的SCI驱动函数,直接在TSK中调用也没有问题,为什么还要加GIO?DVE有什么用?