创建，添加sdram

rt-thread/libcpu/arm/cortex-a/SConscript

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+# RT-Thread building script for component
+
+from building import *
+
+Import('rtconfig')
+
+cwd     = GetCurrentDir()
+src     = Split('''
+cache.c
+cpuport.c
+gtimer.c
+mmu.c
+pmu.c
+stack.c
+backtrace.c
+''')
+CPPPATH = [cwd]
+
+if GetDepend('RT_USING_GIC_V2'):
+    src += ['interrupt.c']
+    src += ['gic.c']
+    src += ['trap.c']
+
+if GetDepend('RT_USING_GIC_V3'):
+    src += ['interrupt.c']
+    src += ['gicv3.c']
+    src += ['trap.c']
+
+if rtconfig.PLATFORM in ['armcc', 'armclang']:
+    src += Glob('*_rvds.S')
+
+if rtconfig.PLATFORM in ['gcc']:
+    src += Glob('*_init.S')
+    src += Glob('*_gcc.S')
+
+if rtconfig.PLATFORM in ['iccarm']:
+    src += Glob('*_iar.S')
+
+if rtconfig.PLATFORM in ['iccarm']:
+    src += Glob('*_iar.S')
+
+group = DefineGroup('libcpu', src, depend = [''], CPPPATH = CPPPATH)
+
+Return('group')