android: howto put custom .so to /system/lib dir

There are two problems:

1. no permission to write to /system/lib --> chmod /system/lib

2. you cannot chmod /system dir because it is ro file system --> remount it as rw file system

Here are the steps:

1. remount /system with rw

# mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system

your devices mounting point can be identified with simple 'mount' cmd at shell.

2. chmod /system/lib

# chmod 6755 /system/lib

3. push your .so to /system/lib

adb push your_custom.so /system/lib