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CPU跑linux系统跑不起来



CPU为dm368,我用仿真器下载gel文件,CPU设成432MHz,DDR2设成340MHz,,对DDR2进行全速测试,没问题。但用uboot引导linux (uImage映像)跑到starting kernel...后死掉,把CPU频率和ddr2频率下降到dm365(CPU:297MHz  DDR2:270MHz)能正常启动,不知道为什么?