SWITCH(3)SWITCH(3)NAMEswitch - hardware option switchSYNOPSYS
bind -a '#r' /dev
/dev/switch
DESCRIPTION
The switch device serves a one-level directory, giving access to one
read-only file, switch. A read returns the value of the development
board's option switch (DS1), represented as a decimal number from 0 to
15, representing four bits, each corresponding to one of the four tog‐
gles. Each toggle produces the value 0 when it is set `ON' and 1 when
it is off. Toggle 1 corresponds to bit 1<<3 in the number, toggle 2
corresponds to bit 1<<2, and so on
SOURCE
/os/mpc/devrtc.c
MPC8xx SWITCH(3)