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i2c2 问题

大家好,目前想在uboot阶段初始化i2c LCD显示屏,为i2c2口,目前在i2c_set_bus_num(2)时,uboot会挂死,具体分析应该是访问i2c2寄存器就挂死。但是设置i2c0和i2c1的时候都不会出现问题,是uboot中默认不支持i2c2的初始化吗?还是没有配置i2c控制器的时钟?