boot
—
system bootstrapping procedures
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.
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).
-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.
- /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