1.\" $OpenBSD: boot_alpha.8,v 1.15 2007/05/31 19:19:59 jmc Exp $ 2.\" 3.\" Copyright (c) 2002, Miodrag Vallat. 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.Dd $Mdocdate: May 31 2007 $ 26.Dt BOOT_ALPHA 8 alpha 27.Os 28.Sh NAME 29.Nm boot_alpha 30.Nd Alpha system bootstrapping procedures 31.Sh DESCRIPTION 32.Ss Cold starts 33When powered on, the SRM firmware will proceed to its initialization, and 34will boot an operating system if the 35.Em auto_action 36variable is set to 37.Dq boot 38or 39.Dq restart , 40or will wait for interactive commands if set to 41.Dq halt . 42.Ss Warm starts 43After a panic, or if the system is rebooted via 44.Xr reboot 8 45or 46.Xr shutdown 8 , 47the SRM console will only restart the system if the 48.Em auto_action 49variable is set to 50.Dq boot . 51.Ss Boot process options 52The SRM console will attempt to boot a kernel named from the 53.Em boot_file 54environment variable, on the device listed in the 55.Em bootdef_dev 56variable. 57A list of the recognized SRM devices can be obtained with the command 58.Ic show dev 59at the SRM prompt. 60If the 61.Em boot_file 62variable is not set or empty, 63.Pa /bsd 64will be used by default. 65.Pp 66The kernel will be passed the options listed in the 67.Em boot_osflags 68variable. 69Option letters are case insensitive. 70The following option letters are recognized: 71.Bl -tag -width "XXX" -offset indent -compact 72.Pp 73.It Cm a 74Boot the system multi-user. 75This is the default behaviour of the kernel if no flags are specified. 76.It Cm b 77Enter the debugger, 78.Xr ddb 4 , 79as soon as the kernel console has been initialized. 80.It Cm c 81Enter the 82.Dq User Kernel Configuration 83mode upon startup 84.Pq Xr boot_config 8 . 85.It Cm d 86Create a kernel crash dump immediately after the devices have been configured. 87This option is only available on kernels compiled with 88.Qq option DEBUG . 89.It Cm h 90On the next system reboot, always halt the system, even if a reboot is 91required. 92.It Cm n 93Prompt for the root filesystem device after the devices have been configured. 94.It Cm s 95Boot the system single-user. 96.El 97.Ss Abnormal system termination 98In case of system crashes, the kernel will usually enter the kernel 99debugger, 100.Xr ddb 4 , 101unless it is not present in the kernel, or it is disabled via the 102.Em ddb.panic 103sysctl. 104Upon leaving ddb, or if ddb was not entered, the kernel will halt the system 105if it was still in device configuration phase, or attempt a dump to the 106configured dump device, if possible. 107The crash dump will then be recovered by 108.Xr savecore 8 109during the next multi-user boot cycle. 110It is also possible to force other behaviours from ddb. 111.Sh FILES 112.Bl -tag -width /usr/mdec/netboot -compact 113.It Pa /bsd 114default system kernel 115.It Pa /bsd.rd 116standalone installation kernel, suitable for disaster recovery 117.It Pa /usr/mdec/bootxx 118primary bootstrap for 119.Dq ffs 120file system 121.It Pa /usr/mdec/boot 122secondary bootstrap (usually also installed as 123.Pa /boot ) 124.It Pa /usr/mdec/netboot 125network bootstrap 126.El 127.Sh SEE ALSO 128.Xr ddb 4 , 129.Xr boot_config 8 , 130.Xr halt 8 , 131.Xr init 8 , 132.Xr installboot 8 , 133.Xr reboot 8 , 134.Xr savecore 8 , 135.Xr setnetbootinfo 8 , 136.Xr shutdown 8 137.Rs 138.%T "Alpha Architecture Reference Manual Third Edition" 139.%Q "Alpha Architecture Committee" 140.%I "Digital Press" 141.%D 1998 142.Re 143.Sh BUGS 144The device names used by 145.Ox Ns / Ns alpha 146and the 147.Tn SRM Console 148often have no relation to each other. 149