32V/usr/man/man8/bproc.8
.TH BPROC 8 "UNIX/32V"
.tr |
.SH NAME
boot procedures \- UNIX/32V startup
.SH DESCRIPTION
.I "How to start UNIX/32V.||"
UNIX/32V is started by placing it in memory
at location zero and transferring to its entry address.
Since the system is not reenterable,
it is necessary to read it in from disk or tape.
The LSI-11 console computer is used to do this.
.PP
The LSI-11 must first be in the right frame of mind. When it is,
it will type three greater-than signs `>>>' as a prompt.
If you do not see this prompt, type control-P and ``HALT\er''
to gain the attention of the LSI-11.
If the last printout on the console is a six-digit octal number and
an at-sign `@', then the LSI-11 has crashed and is in ODT mode.
Type ``173000G'' to boot the LSI-11. If this fails, open the VAX-11
cabinet and flick the HALT/ENABLE switch on the LSI-11 first to HALT,
then to ENABLE.
.PP
To boot from disk, first put the LSI-11 in the right frame of mind and then
mumble the following incantation through the console
(parentheses indicate comments which should not be mumbled):
.PP
.nf
\fI>>>\|\fRHALT
\fI>>>\|\fRLINK (save the following sequence on the floppy)
(the prompt should change to <<<)
\fI<<<\|\fRHALT
\fI<<<\|\fRUNJAM
\fI<<<\|\fRINIT
\fI<<<\|\fRD 30000 00009FDE
\fI<<<\|\fRD + D0512001
\fI<<<\|\fRD + D004A101
\fI<<<\|\fRD + 0400C113
\fI<<<\|\fRD + 10008F32
\fI<<<\|\fRD + D40424C1
\fI<<<\|\fRD + 8FD00CA1
\fI<<<\|\fRD + 80000000
\fI<<<\|\fRD + 320800C1
\fI<<<\|\fRD + A1FE008F
\fI<<<\|\fRD + 28C1D410
\fI<<<\|\fRD + 14C1D404
\fI<<<\|\fRD + C139D004
\fI<<<\|\fRD + 00000400
\fI<<<\|\fRSTART 30000
\fI<<<\|\fRSTART 2
(to exit from linking mode type `control-c')
\fI<<<\|\fR`control-c'
\fI>>>\|\fRPERFORM (the magic word)
.fi
.PP
This causes the LSI-11 to read block 0, unit 0, MBA 0 into memory at
location 0 and start the VAX-11 at location 0 when the read has finished.
In a standard file system, block 0 contains the program
.IR uboot .
.I uboot
executes the file
.I /fboot
which it finds in the file system which resides at the beginning of
unit 0, MBA 0.
.I fboot
prints a prompt, reads a file name (usually `unix') from the console,
finds that file, reads it into memory at location 0, and transfers to it.
.PP
The second and subsequent times that the system is booted, you need only
utter the magic word PERFORM; the LSI-11 will do all the chanting.
This takes all the fun out of booting, but it is faster.
.PP
The above program is an assembled version of this code.
.PP
.nf
.if n .ta 3 14 21 41 49
.if t .ta .3i 1i 1.6i 3.5i
RP06 disk (MBA 0, drive 0)
00009fde moval *$0x20010000,r1 # MBA 0
\0\0512001
d0 movl $1,4(r1) # initialize MBA
\0\004a101
d0 movl $0x13,0x400(r1) # volume valid
0400c113
10008f32 cvtwl $0x1000,0x424(r1) # 16-bit format
\0\00424c1
d4 clrl 12(r1) # map reg. 0, offset 0
\0\0\0\00ca1
8fd0 movl $0x80000000,0x800(r1) # valid, page 0/0
80000000
\0\00800c1
32 cvtwl $-512,16(r1) # byte count
a1fe008f
\0\0\0\0\0\010
28c1d4 clrl 0x428(r1) # cylinder
\0\0\0\0\0\004
14c1d4 clrl 0x414(r1) # sector, track
\0\0\0\0\0\004
c139d0 movl $0x39,0x400(r1) # read 1 block
\0\0\0\00400
\0\000 halt
.fi
.PP
To boot from magnetic tape: The
.IR tp (1)
command places the bootstrap program
.I mboot
on block 0 of the tape. When read into memory at location 0 and executed,
.I mboot
prompts with an equal sign `=', reads a file name from the console,
then loads and executes that file from the
.I tp
tape. Unfortunately DEC does not provide a console command to read
a block from tape to memory. Here is a position-independent program
which does:
.PP
.nf
TM03 magtape (MBA 1, drive 0) from load point:
.if n .ta 3 14 21 41 49
.if t .ta .3i 1i 1.6i 3.5i
20009fde moval *$0x20012000,r1 # MBA 1
\0\0512001
d0 movl $1,4(r1) # initialize
\0\004a101
32 cvtwl $0x13c0,0x424(r1) # drive characteristics
c113c08f
\0\0\0\00424
a1d4 clrl 12(r1) # map reg. 0, offset 0
\0\0\0\0\0\00c
008fd0 movl $0x80000000,0x800(r1) # valid, page 0/0
c1800000
\0\0\0\00800
8f32 cvtwl $-512,16(r1) # byte count
10a1fe00
00c139d0 movl $0x39,0x400(r1) # read 1 block
\0\0\0\0\0\004
\0\0\0\000 halt
Then give the console command ``START 0\er''.
.fi
.PP
.IR mboot\ and\ fboot
do not perform character erase and line kill editing. Instead,
they start over with the prompt for file name whenever the requested
file cannot be found.
.PP
Be sure that
.I mboot
exists whenever a
.I tp
tape is made. Remember to put
.IR uboot\ and\ /fboot
in file systems when running
.IR mkfs .
.SH FILES
.ta \w'/usr/mdec/mboot 'u
/unix UNIX/32V code
.br
/usr/mdec/uboot disk bootstrap
.br
/fboot file system bootstrap
.br
/usr/mdec/mboot
.IR tp ""
magtape bootstrap
.SH "SEE ALSO"
tp(1), init(8)