Custom system.img and load/test on emulator

[Guest int2eh]

Sorry for my English! I want to create an image

custom of /system (system.img)to use it and

test with the emulator. To do this I proceeded to:

1) Start Emulator with 128 MB partition size

2) mount / systen write option with mount-o rw, remount-t yaffs2 / dev/block/mtdblock3 /system and chmod 777 /system

3) adb push mkfs.yaffs2.arm in /system

4) go comand mkfs.yaffs2 /system system.img

5) adb pull system.img

6) why system.img is small (44MB?)

7) replace system.img in folder on Platform sdk

8) emulator not run ...

9) why not run ? (stop on test Android_ )