boot(8) - NetBSD Manual Pages

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BOOT(8)              NetBSD/amiga System Manager's Manual              BOOT(8)


NAME

     boot -- system bootstrapping procedures


DESCRIPTION

   Power fail and crash recovery
     When the NetBSD 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 shutdown(8) command.

     If the system crashes, it will enter the kernel debugger, 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 savecore(8) during the
     next boot cycle).  After the dump is complete (successful or not), the
     system will attempt a reboot.

   Booting NetBSD using the bootloader
     When a bootable NetBSD partition is created by means of HDTOOLBOX or
     another RDB editing program and a bootblock has been copied there by
     installboot(8) and the boot priority of the NetBSD partition is either
     the highest or the NetBSD partition is selected by means of the boot
     menu, the Amiga ROM will automatically start the NetBSD bootloader. By
     default it will, after a short timeout, load the kernel image /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:

           kernel-path [-abknpqstvADZ] [-c model] [-m memsize] [-n
           memsegments] [-I mask] [-S amount] [-T amount]

     kernel-path
           This gives you the opportunity to boot another kernel, say:
           /netbsd.old.  The default is /netbsd.

     -a    Autoboot into multi-user mode (default).

     -b    Prompt for the root file system device, the system crash dump
           device, and the path to init(8).

     -c model
           force machine model.  Use 32000+(Qlogic chip revision) for the
           DraCo.

     -k    Reserve the first 4M of fastmem.

     -m memsize
           Force fastmem size to be memsize kBytes.

     -n    maximum number of segments of memory to use, encoded as follows: 0
           (default): 1 segment, 1: 2 segments, 2: 3 or more segments.

     -p    Select kernel load segment by priority instead of size.

     -q    Boot in quiet mode.

     -s    Boot into single-user mode.

     -v    Boot in verbose mode.

     -D    Enter the kernel debugger (best used with -S)

     -I mask
           inhibit sync negotiation as follows: The 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.

     -S    Load the  kernel symbols

   Booting NetBSD using the loadbsd program
     When you want (or have to) start NetBSD from AmigaOS, you have to use the
     loadbsd program that is supplied in the utils directory of the distribu-
     tion.  The loadbsd command line specification is:

           loadbsd [-abknpstADZ] [-c model] [-m memsize] [-n memsegments] [-I
           mask] [-S amount] [-T amount] kernel-path

     Description of options:

     -a    Autoboot into multi-user mode.

     -b    Prompt for the root file system device, the system crash dump
           device, and the path to init(8).

     -c    force machine model.

     -k    Reserve the first 4M of fastmem.

     -m    Force fastmem size to be memsize kBytes.

     -n    maximum number of segments of memory to use, encoded as follows: 0
           (default): 1 segment, 1: 2 segments, 2: 3 or more segments.

     -p    Select kernel load segment by priority instead of size.

     -s    Boot into single-user mode.

     -t    Test loading of the kernel but don't start NetBSD.

     -A    enable AGA modes.

     -D    Enter the kernel debugger after booting. Best with -S.

     -I mask
           inhibit sync negotiation as follows: The mask is a bitmap expressed
           in hexadecimal (e.g., ff) with 4*8bits, each bit, if set to 1, dis-
           abling 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.

     -S    include kernel debug symbols (for use by -D).

     -Z    Force load via chip memory. Won't work if kernel is larger than the
           chip memory size or on the DraCo.

     Note: Because the loadbsd program can only read kernels from a AmigaOS
     filesystem, the file /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 NetBSD
     root partition from AmigaOS.


FILES

     /netbsd               system kernel
     /usr/mdec/bootxx_ffs  RDB device primary boot block
     /usr/mdec/bootxx_fd   floppy disk primary boot block
     /usr/mdec/boot.amiga  secondary bootstrap
     /boot.amiga           secondary bootstrap (installed)


SEE ALSO

     ddb(4), fsck_ffs(8), installboot(8), newfs(8), savecore(8), shutdown(8)


BUGS

     Due to code size restrictions, you can't currently use an old-style file
     system (created with newfs(8) -O or with NetBSD 0.9) with the boot block.
     You can use loadbsd to boot from AmigaOS, or upgrade the file system with
     fsck_ffs -c 2.

NetBSD 5.2                       April 8, 2003                      NetBSD 5.2