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* 通过读取0x120100E4 可以看到CPU的频率已经配置为:
A53:1188MHz
A73:APLL FOUTVCO;(FREF x ( fbdiv + frac/ 224) / refdiv) , 计算肯定是大于1000Mhz的,
此寄存器直接在uboot启动过程中进行配置,
但是通过cat /proc/cpuinfo 中看到的BogoMIPS的内容仅仅为100M
通过分析代码可以知道这个通过计算得来的, 更改 lpj的值可以让BogoMIPS的值改变
修改
setenv bootargs 'mem=512M lpj=240000 console=ttyAMA0,115200
root=/dev/mmcblk0p3 rootfstype=ext4 rw rootwait
blkdevparts=mmcblk0:1M(boot),10M(kernel),1024M(rootfs) '
看到是BogoMIPS是480M
修改为:
setenv bootargs 'mem=512M lpj=500000 console=ttyAMA0,115200
root=/dev/mmcblk0p3 rootfstype=ext4 rw rootwait
blkdevparts=mmcblk0:1M(boot),10M(kernel),1024M(rootfs) '
看到是BogoMIPS是1000M
为何没有与实际的clock进行匹配呢?