Uart debug before console ready low level debug
2014-01-09 11:15
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在系统最早阶段，如果系统异常，甚至kernel panic时，错误信息都会dump在console上；如果在console ready 前就出现了问题，造成系统crash，就看不到任何输出了。Kernel提供了一种方法允许printk的内容直接输出到UART，这个可以在kernel的menuconfig选项里打开
CONFIG_DEBUG_LL: Kernel Hacking -> Kernel Debugging -> Kernel Low-Level debugging functions.
CONFIG_DEBUG_LL: Kernel Hacking -> Kernel Debugging -> Kernel Low-Level debugging functions.
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