Digital Equipment VAXstation 3100 Maintenance Manual page 95

7 4 Utllltles
>>>
TEST 52
00000000 ?
>>>
00000010
>>>
OR
>>>
SET BFLG 00000010
>>>
Figure 3-11 Example of Changing the Default Boot Flag
You can specify one or any combination of boot flags
in
the NVR. To specify
more than one ftag, enter the sum value
(in
hexadecimal) of the ftags that
yon
want loaded into the NVR. For example, if you want to specify the RPB$V _
DIAO flag, RPB$V _HALT flag, and the RPB$V _l\1PM ftag, add all three
ftags as shown in Figure ~12
and enter the sum into
NVR.
RPB$V DIAG
RPB$V-HALT
RPB$V::::MPM
00000010
00000200
00000800
Enter this code OOOOOAlO
Figure 3-12 Determining the NVR Code for Three Boot Flags
Table 3-5 Boot Flags Used by ULTRIX
Flag
00000001
00000002
00000004
00000008
Deftnltlon
RPB$V
CONV - Conversational boot. This
will
force
ULTRIXBOOT
to prompt the
user
for
an
image name which
would presumably
be
different from the default 'vmunix'. If
the
DIAO is also on, then t.'le user is prompted for the diagnostic
supervisor image name.
RPB$V _DEBUO -
If this flag is set, the ULTRIX kemal image
is booted to single-user mode.
RPB$V _INIBPT - Initial
breakpoint.
If RPB$V _DEBUG is
set, VMS executes
a
BPT instruction immediately after enabling
mapping.
RPB$V _BBLOCK - Seondary boot
from
boot block. Secondary
bootstrap is a single 512 byte block, whose LBN is specified in
R4. R4
must be
0
for
ULTRIX.