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基于SDK7.0,怎么让AM335x运行在1G的频率?

前阵子一个半月摸索,终于从SDK6.0迁移到了SDK7.0,现在使用device-tree的方式。

u-boot初始化了1G的频率,但是根据下列启动信息,内核最终采取了600M的频率。
[ 0.000247] Calibrating delay loop... 663.55 BogoMIPS (lpj=3317760)
。。。。。。。。。。。。。
[ 1.863422] cpufreq_cpu0: Bootloader freq 1000000000Hz no match to table, Using 600000000Hz

命令cat proc/cpuinfo看不到CPU频率。
[root@xxxxx /]# cat proc/cpuinfo
processor : 0
model name : ARMv7 Processor rev 2 (v7l)
Features : swp half thumb fastmult vfp edsp thumbee neon vfpv3 tls vfpd32
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x3
CPU part : 0xc08
CPU revision : 2

Hardware : Generic AM33XX (Flattened Device Tree)
Revision : 0000
Serial : 0000000000000000