ARM架構，裸機開機程序+MMU初始化+中斷初始化範例-ARM architecture, bare metal boot program initialization+ interrupt initialization example+MMU

ARM架构，裸机开机程序，UART 初始化，并启动MMU，利用映射的记忆体位址印出Hello world.-ARM architecture, bare metal boot process, UART initialization and start MMU, memory addresses using the maps of print Hello world.

Based on arch arm include asm traps.h.Traps Non-MMU Exception handling for ARC.