screwed my /etc/init.d/rc.local
boot from ssd,
i edited /etc/init.d/rc.local,
put a check there, if it's good then reboot for my stress test,
if not good, then just stop at linux prompt
now my check logic is wrong, it keeps on rebooting.
plug in SD card (without ssd, the board can boot from SD),
still boot from ssd.
What to do ?