1.\" $OpenBSD: boot_alpha.8,v 1.17 2023/03/13 20:32:28 miod 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: March 13 2023 $ 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 from the device listed in the 53.Em bootdef_dev 54variable. 55A list of the recognized SRM devices can be obtained with the command 56.Ic show dev 57at the SRM prompt. 58.Pp 59The 60.Ox 61alpha boot loader program is extensively described in a separate document, 62.Xr boot 8 . 63.Ss Abnormal system termination 64In case of system crashes, the kernel will usually enter the kernel 65debugger, 66.Xr ddb 4 , 67unless it is not present in the kernel, or it is disabled via the 68.Em ddb.panic 69sysctl. 70Upon leaving ddb, or if ddb was not entered, the kernel will halt the system 71if it was still in device configuration phase, or attempt a dump to the 72configured dump device, if possible. 73The crash dump will then be recovered by 74.Xr savecore 8 75during the next multi-user boot cycle. 76It is also possible to force other behaviours from ddb. 77.Sh FILES 78.Bl -tag -width /usr/mdec/netboot -compact 79.It Pa /bsd 80default system kernel 81.It Pa /bsd.rd 82standalone installation kernel, suitable for disaster recovery 83.It Pa /usr/mdec/bootxx 84primary bootstrap for 85.Dq ffs 86file system 87.It Pa /usr/mdec/boot 88secondary bootstrap (usually also installed as 89.Pa /boot ) 90.It Pa /usr/mdec/netboot 91network bootstrap 92.El 93.Sh SEE ALSO 94.Xr ddb 4 , 95.Xr boot 8 , 96.Xr boot_config 8 , 97.Xr halt 8 , 98.Xr init 8 , 99.Xr installboot 8 , 100.Xr reboot 8 , 101.Xr savecore 8 , 102.Xr setnetbootinfo 8 , 103.Xr shutdown 8 104.Rs 105.%T "Alpha Architecture Reference Manual Third Edition" 106.%Q "Alpha Architecture Committee" 107.%I "Digital Press" 108.%D 1998 109.Re 110.Sh BUGS 111The device names used by 112.Ox Ns / Ns alpha 113and the 114.Tn SRM Console 115often have no relation to each other. 116