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\"      From:
\"      @(#)boot_hp300.8        8.2 (Berkeley) 4/19/94
\"
Dd February 25, 2021
Dt BOOT 8 amiga
Os
Sh NAME
Nm boot
Nd
system bootstrapping procedures
Sh DESCRIPTION
Ss Power fail and crash recovery
When the
Nx
kernel is booted normally (using one of the two methods discussed below),
it initializes itself and proceeds to boot the system.
An automatic consistency check of the file systems takes place,
and unless this fails, the system comes up to multi-user operations.
The proper way to shut the system down is with the
Xr shutdown 8
command.
Pp
If the system crashes, it will enter the kernel debugger,
Xr ddb 4 ,
if it is configured in the kernel.
If the debugger is not present,
or the debugger is exited, the system will attempt a dump to the
configured dump device (which will be automatically recovered with
Xr savecore 8
during the next boot cycle).
After the dump is complete (successful
or not), the system will attempt a reboot.
Ss Booting NetBSD using the bootloader
When a bootable
Nx
partition is created by means of HDTOOLBOX or another RDB editing program
and a bootblock has been copied there by
Xr amiga/installboot 8
and the boot priority of the
Nx
partition is either the highest or the
Nx
partition is selected by means of the boot menu,
the Amiga ROM will automatically start the
Nx
bootloader.
By default it will, after a short timeout, load the kernel image
Pa /netbsd
and attempt to boot it into multi-user mode.
This behaviour can be changed by
typing in an alternate command sequence.
The command line looks like:
Bd -ragged -offset indent
Ar kernel-path
Op Fl abkpqsvACDS
Op Fl c Ar model
Op Fl m Ar memsize
Op Fl n Ar memsegments
Op Fl I Ar mask
Ed
Bl -tag -width flag
It kernel-path
This gives you the opportunity to boot another kernel, say:
Pa /netbsd.old .
The default is
Pa /netbsd .
It Fl a
Autoboot into multi-user mode (default).
It Fl b
Prompt for the root file system device, the system crash dump
device, and the path to
Xr init 8 .
It Fl c Ar model
force machine
Ar model .
Use 32000+(Qlogic chip revision) for the DraCo.
It Fl k
Reserve the first 4M of fastmem.
It Fl m Ar memsize
Force fastmem size to be
Ar memsize
kBytes.
It Fl n
maximum number of
Ar segments
of memory to use, encoded as follows: 0 (default): 1 segment, 1:
2 segments, 2: 3 or more segments.
It Fl p
Select kernel load segment by priority instead of size.
It Fl q
Boot in quiet mode.
It Fl s
Boot into single-user mode.
It Fl v
Boot in verbose mode.
It Fl A
Enable AGA display modes.
It Fl C
Use the serial port as console.
It Fl D
Enter the kernel debugger (best used with
Fl S ) .
It Fl I Ar mask
inhibit sync negotiation as follows: The
Ar mask
is a bitmap expressed in C notation (e.g., 0xff)
with 4*8bits, each bit, if set to 1, disabling sync negotiation for
the corresponding target.
Note that this only applies to (some of the)
real SCSI busses, but not, e.g., to internal IDE.
The bytes are used up
from right to left by SCSI bus drivers using this convention.
It Fl S
include kernel debug symbols (for use by
Fl D ) .
El
Ss Booting NetBSD using the loadbsd program
When you want (or have to) start
Nx
from AmigaOS, you have to use the
Ic loadbsd
program that is supplied in the utils directory of the distribution.
The loadbsd command line specification is:
Bd -ragged -offset indent
Nm loadbsd
Op Fl abkpqstvACDSZ
Op Fl c Ar model
Op Fl m Ar memsize
Op Fl n Ar memsegments
Op Fl I Ar mask
Ar kernel-path
Ed
Pp
Description of options:
Bl -tag -width flag
It Fl a
Autoboot into multi-user mode.
It Fl b
Prompt for the root file system device, the system crash dump
device, and the path to
Xr init 8 .
It Fl c
force machine model.
It Fl k
Reserve the first 4M of fastmem.
It Fl m
Force fastmem size to be
Ar memsize
kBytes.
It Fl n
maximum number of
Ar segments
of memory to use, encoded as follows: 0 (default): 1 segment, 1:
2 segments, 2: 3 or more segments.
It Fl p
Select kernel load segment by priority instead of size.
It Fl q
Boot in quiet mode.
It Fl s
Boot into single-user mode.
It Fl t
Test loading of the kernel but don't start
Nx .
It Fl v
Boot in verbose mode.
It Fl A
enable AGA display modes.
It Fl C
Use the serial port as console
It Fl D
Enter the kernel debugger (best used with
Fl S ) .
It Fl I Ar mask
inhibit sync negotiation as follows: The
Ar mask
is a bitmap expressed in hexadecimal (e.g., ff)
with 4*8bits, each bit, if set to 1, disabling sync negotiation for
the corresponding target.
Note that this only applies to (some of the)
real SCSI busses, but not, e.g., to internal IDE.
The bytes are used up
from right to left by SCSI bus drivers using this convention.
It Fl S
include kernel debug symbols (for use by
Fl D ) .
It Fl Z
Force load via chip memory.
Won't work if kernel is larger than the chip memory size or on the
DraCo.
El
Pp
Note: Because the loadbsd program can only read kernels from a AmigaOS
filesystem, the file
Ar /netbsd
is often not the same as the actual kernel booted.
This can cause some programs to fail.
However, note that you can use third-party Berkeley
filesystems such as bffs to access the
Nx
root partition from AmigaOS.
Sh FILES
Bl -tag -width /usr/mdec/bootxx_ffsv1 -compact
It Pa /netbsd
system kernel
It Pa /usr/mdec/bootxx_ffsv1
RDB device primary boot block for FFSv1 (and ustarfs)
It Pa /usr/mdec/bootxx_ffsv2
RDB device primary boot block for FFSv2
It Pa /usr/mdec/bootxx_fd
floppy disk primary boot block
It Pa /usr/mdec/boot.amiga
secondary bootstrap
It Pa /boot.amiga
secondary bootstrap (installed)
El
Sh SEE ALSO
Xr ddb 4 ,
Xr amiga/installboot 8 ,
Xr fsck_ffs 8 ,
Xr newfs 8 ,
Xr savecore 8 ,
Xr shutdown 8
Sh BUGS
Due to code size restrictions, you can't currently use an old-style file
system (created with
Xr newfs 8
-O
or with
Nx 0.9 )
with the boot block.
You can use
Ic loadbsd
to boot from AmigaOS, or upgrade the file system with
Ar fsck_ffs -c 2 .

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