编译amlogic android kernel 无法正常启动问题

今天编译了amlogic android kernel ，升级到板子上后无法正常启动，查看串口的log出现了下面的错误：

[    4.528115@1] init: skipping insecure file '/init.rc'

[    9.221520@1] init: Timed out waiting for /dev/.coldboot_done
[    9.221765@1] init: Unable to open persistent property directory /data/property errno: 2
[    9.230063@1] init: Cannot read /dev/block/cardblkinand2: -1.
[    9.235445@1] init: Cannot read /dev/block/cardblkinand2: -1.
[    9.241203@1] init: Cannot read /dev/block/cardblkinand2: -1.
[    9.246925@1] init: Cannot read /dev/block/cardblkinand2: -1.
[    9.252627@1] init: Cannot read /dev/block/cardblkinand2: -1.

原因是system/core/init/util.c 中加入了init.rc文件用户组写权限的检查，解决方法：

在代码根目录下 chmod 644 ./system/core/rootdir/init.rc