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今天测试一个程序时，发现没有/dev/mem。是我的固件太老了，还是需要自己编译内核启用这个设备？
@zealsoft make kernel_menuconfig
按 / 搜索 /dev/mem 找到这个选项，勾选重新make&pack即可。
@whycan 谢谢，等疫情结束回到办公室再试吧，笔记本硬盘太小，编译不了
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