Here is some additional information from /proc
[email protected]:/proc # cat devices Character devices: 1 mem 5 /dev/tty 5 /dev/console 5 /dev/ptmx 10 misc 13 input 21 sg 29 fb 81 video4linux 90 mtd 91 spi 108 ppp 116 alsa 128 ptm 136 pts 140 aad 141 adec 142 afe 144 ci 145 de 146 demod 147 denc 148 dimm...