rtc - real-time clock and non-volatile RAM bind #r /dev

/dev/rtc

/dev/nvram

The rtc device supports the Mostek MK48T12-15 Zeropower/Timekeeper and similar devices with real-time clocks and non-volatile RAM.

The rtc file behaves just like /dev/time (see cons (3)). The real-time clock is maintained on-board; /dev/time is set from the file server. Neither is necessarily more accurate.

The nvram file provides (if permission allows) access to the local non-volatile RAM. For example, boot (8) reads the machine's key from there (see auth (8)).

auth (8), boot (8) /sys/src/9/*/devrtc.c