i managed to have my raspi using a readonly filesystem, but i can see the SD card LEd still blinking! how is it possible? this is my mount output: pi@raspberrypi:~$ mount /dev/ root on / type ext4 ( ro ,noatime,data=ordered) devtmpfs on /dev type devtmpfs (rw,relatime,size=216108k,nr_inodes=54027,mo...