NAME
boot —
system bootstrapping
procedures
DESCRIPTION
Power fail and crash
recovery
Normally, the system will reboot itself at power-up or after crashes. An
automatic consistency check of the file systems will be performed as described
in
fsck(8), and unless this
fails, the system will resume multi-user operations.
Cold starts
A disk-boot program (
/usr/mdec/ufsboot) will attempt to load
netbsd from partition A of the boot device, which must
currently be an “sd” disk. Alternatively, network boot program
(
/usr/mdec/netboot) will load
netbsd from
the NFS root as determined by the procedure described in
diskless(8).
Boot program options
-
-
- -a
- Prompt for the root file system device, the system crash
dump device, and the path to
init(8).
-
-
- -d
- Bring the system up in debug mode. Here it waits for a
kernel debugger connect; see
ddb(4).
-
-
- -q
- Boot the system in quiet mode.
-
-
- -s
- Bring the system up in single-user mode.
-
-
- -v
- Boot the system in verbose mode.
Any extra flags or arguments, or the ⟨
boot
string⟩ after the -- separator are passed to the boot PROM. Other
flags are currently ignored.
At any time you can break back to the ROM by pressing the ‘L1’ and
‘a’ keys at the same time (if the console is a serial port the
same is achieved by sending a ‘break’). If you do this
accidentally you can continue whatever was in progress by typing
‘c’ followed by the return key.
FILES
- /netbsd
- system code
- /usr/mdec/bootxx
- first-level boot block for disks
- /usr/mdec/netboot
- boot program for NFS (diskless) boot
- /usr/mdec/ufsboot
- second-level boot program for UFS disks
- /usr/mdec/installboot
- program to install bootxx on a disk
SEE ALSO
disklabel(8),
fsck(8),
halt(8),
init(8),
rc(8),
shutdown(8),
syslogd(8)