1.\" 2.\" SPDX-License-Identifier: BSD-4-Clause 3.\" 4.\" Copyright (c) 1998-2002 Katsushi Kobayashi and Hidetoshi Shimokawa 5.\" All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. All advertising materials mentioning features or use of this software 16.\" must display the acknowledgement as bellow: 17.\" 18.\" This product includes software developed by K. Kobayashi 19.\" 20.\" 4. The name of the author may not be used to endorse or promote products 21.\" derived from this software without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 25.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 26.\" DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 27.\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 28.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 29.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 31.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 32.\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33.\" POSSIBILITY OF SUCH DAMAGE. 34.\" 35.Dd November 11, 2025 36.Dt SBP 4 37.Os 38.Sh NAME 39.Nm sbp 40.Nd Serial Bus Protocol 2 (SBP-2) Mass Storage Devices driver 41.Sh SYNOPSIS 42.Cd "kldload firewire" 43.Cd "kldload cam" 44.Cd "kldload sbp" 45.Pp 46or 47.Pp 48.Cd "device sbp" 49.Cd "device firewire" 50.Cd "device scbus" 51.Cd "device da" 52.Cd "device cd" 53.Cd "device pass" 54.Sh DESCRIPTION 55The 56.Nm 57driver provides support for SBP-2 devices that attach to the FireWire 58(IEEE 1394) port. 59It should work with SBP-2 devices which the CAM layer supports, for example, 60HDDs, CDROM drives and DVD drives. 61.Pp 62Some users familiar with 63.Xr umass 4 64might wonder why the device is not detached at the CAM layer when the device 65is unplugged. 66It is detached only if the device has not been plugged again 67during several bus resets. 68This is for preventing to detach an active file system even when the 69device cannot be probed correctly for some reason after a bus reset 70or when the device is temporary disconnected because the user changes the bus 71topology. 72If you want to force to detach the device, run 73.Ql fwcontrol -r 74several times or set 75.Va hw.firewire.hold_count=0 76by 77.Xr sysctl 8 . 78.Pp 79Some (broken) HDDs do not work well with tagged queuing. 80If you have problems with such drives, try 81.Ql camcontrol [device id] tags -N 1 82to disable tagged queuing. 83.Sh HARDWARE 84The 85.Nm 86driver supports FireWire Serial Bus Protocol 2 87.Pq SBP-2 88storage devices. 89.Sh SEE ALSO 90.Xr cam 4 , 91.Xr firewire 4 , 92.Xr camcontrol 8 , 93.Xr fwcontrol 8 , 94.Xr kldload 8 , 95.Xr sysctl 8 96.Sh AUTHORS 97.An -nosplit 98The 99.Nm 100driver was written by 101.An Katsushi Kobayashi 102and 103.An Hidetoshi Shimokawa . 104.Pp 105This manual page was written by 106.An Katsushi Kobayashi . 107