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RAMGS15 分配给CPU2，CPU2有读写权限，而CPU1只读权限。
CPU1如果对此RAM空间写入数据是无效的，但编译器不会提示错误，CPU有没有办法做保护。
还有个问题：
如果CPU1和CPU2同时访问RAMGS15，会出现什么情况？
急，在线等。。。
