解决 WARNING: Unable to open an initial console
这个主要是没有建立控制台，解决方式：内核选择如下选项：Device Drivers--->Character devices--->
[*] Virtual terminal
Serial drivers--->
<*> 8250/16550 and compatible serial support
[*] Console on 8250/16550 and compatible serial port
(2) Maximum number of 8250/16550 serial ports
(2) Number of 8250/16550 serial ports to register at runtime
[*] Unix98 PTY support
缺少 /dev/console 和 /dev/null
在建立他们之前UDEV就先使用到他们了文件系统中建立如下设备文件：
cd /dev
mknod -m 660 console c 5 1
mknod -m 660 null c 1 3
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