“Warning: cpu: The address range of the slaves connected to the NIOS 2 instruction master exceeds 28 bits. Attempts to call function across 28 bit boundary is not supported by GCC and will result in linker errors”

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  • “Warning: cpu: The address range of the slaves connected to the NIOS 2 instruction master exceeds 28 bits. Attempts to call function across 28 bit boundary is not supported by GCC and will result in linker errors”
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问题原因

没有MMU的系统在部署片外SDRAM的时候就会出现警告，GCC无法调用高于28 bit 以外的函数：

解决方案：

查看您的QSYS布局，对于非存储单元请只连接数据总线，对于存储单元请限制您的指令地址范围，或改为使用MMU实现设计。

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