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fbcbf93f | 1 | .\" Copyright (c) 1991 The Regents of the University of California. |
49177589 WN |
2 | .\" All rights reserved. |
3 | .\" | |
4 | .\" This code is derived from software written and contributed | |
5 | .\" to Berkeley by William Jolitz. | |
6 | .\" | |
fbcbf93f | 7 | .\" %sccs.include.redist.roff% |
49177589 | 8 | .\" |
50d77188 | 9 | .\" @(#)boot_i386.8 1.3 (Berkeley) %G% |
49177589 | 10 | .\" |
fbcbf93f | 11 | .Dd |
50d77188 | 12 | .Dt BOOT 8 |
fbcbf93f CL |
13 | .Os |
14 | .Sh NAME | |
50d77188 | 15 | .Nm boot |
fbcbf93f | 16 | .Nd |
50d77188 | 17 | system bootstrapping procedures |
fbcbf93f | 18 | .Sh DESCRIPTION |
fbcbf93f | 19 | .Sy Power fail and crash recovery. |
49177589 | 20 | Normally, the system will reboot itself at power-up or after crashes. |
50d77188 | 21 | An automatic consistency check of the file systems will be performed, |
49177589 | 22 | and unless this fails, the system will resume multi-user operations. |
fbcbf93f | 23 | .Pp |
50d77188 | 24 | .Sy Cold starts. |
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25 | The 386 |
26 | .Tn "PC AT" | |
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27 | clones attempt to boot the floppy disk drive A (otherwise known as drive |
28 | 0) first, and failing that, attempt to boot the hard disk C (otherwise | |
29 | known as hard disk controller 1, drive 0). | |
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30 | The automatic boot will attempt to load |
31 | .Pa vmunix | |
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32 | from partition A of either the floppy or the hard disk. |
33 | This boot may be aborted by typing any character on the keyboard repeatedly | |
34 | (four or five times at least) during the operating system load phase, after | |
35 | which the bootstrap will prompt for the file that you wish to load instead. | |
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36 | .Pp |
37 | One exception to this is the | |
38 | .Ql d | |
50d77188 | 39 | key, which will not abort the load but instead silently force the |
fbcbf93f | 40 | .Dv DEBUG |
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41 | boot flags. |
42 | The boot flags for an autoboot are 0, and 3 for the successive boot after | |
43 | an aborted autoboot sequence. | |
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44 | No other provison is made for setting boot flags (yet). |
45 | A specific device or bootstrap file may be used; for example, | |
fbcbf93f | 46 | .Pp |
49177589 | 47 | The file specifications used for the boostrap |
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48 | when loaded with the |
49 | .Dq askme | |
50 | flag | |
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51 | (e.g. an aborted autoboot) |
52 | are of the form: | |
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53 | .Pp |
54 | .Dl device unit partition: | |
55 | .Pp | |
49177589 | 56 | where |
fbcbf93f | 57 | .Ar device |
49177589 | 58 | is the type of the device, assumed to be on the ISA bus, to be searched, |
fbcbf93f | 59 | .Ar unit |
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60 | is the unit number of the disk or tape, |
61 | and | |
fbcbf93f | 62 | .Ar partition |
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63 | is the disk partition or tape file number. |
64 | Normal line editing characters can be used when typing the file specification. | |
65 | The following list of supported devices may vary from installation to | |
66 | installation: | |
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67 | .Bd -unfilled -offset indent |
68 | wd ST506, IDE, ESDI, RLL disks on a WD100[2367] or lookalike | |
69 | controller | |
70 | fd 5 1/4" or 3 1/2" High density floppies | |
71 | .Ed | |
72 | .Pp | |
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73 | For example, |
74 | to boot from a file system which starts at cylinder 0 | |
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75 | of unit 0 of an IDE disk, type |
76 | .Dq Li wd0a:vmunix | |
77 | to the boot prompt; | |
78 | .Dq Li fd0a:vmunix | |
49177589 | 79 | would specify a 3 1/2" floppy drive 0 . |
fbcbf93f | 80 | .Pp |
49177589 | 81 | In an emergency, the bootstrap methods described in the paper |
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82 | .%T "Installing and Operating 4.3 BSD-Reno UNIX on the AT/386" |
83 | can be used | |
49177589 | 84 | to boot from a distribution tape. |
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85 | .Sh FILES |
86 | .Bl -tag -width /vmunixxx -compact | |
87 | .It Pa /vmunix | |
88 | system code | |
89 | .It Pa /boot | |
90 | system bootstrap | |
91 | .El | |
92 | .Sh SEE ALSO | |
fbcbf93f | 93 | .Xr halt 8 , |
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94 | .Xr reboot 8 , |
95 | .Xr shutdown 8 | |
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96 | .Sh BUGS |
97 | The disklabel format used by this version of | |
98 | .Bx | |
99 | is quite | |
100 | different from that of other architectures. |