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Allow people to set the default boot slice with boot0cfg.

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PR:		18923
Submitted by:	Ian Dowse <iedowse@maths.tcd.ie>
Reviewed by:	jhb
Approved by:	rnordier
This commit is contained in:
David Malone 2000-08-17 18:42:13 +00:00
parent 83e6c3a401
commit 81e309b71b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=64797
2 changed files with 28 additions and 4 deletions
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9
usr.sbin/boot0cfg/boot0cfg.8
View File

@ -38,6 +38,7 @@
.Op Fl f Ar file
.Op Fl m Ar mask
.Op Fl o Ar options
.Op Fl s Ar slice
.Op Fl t Ar ticks
.Ar disk
.Sh DESCRIPTION
@ -118,6 +119,14 @@ and to save slice selection information.) This is the default; a
.Sq noupdate
option causes the MBR to be treated as read-only.
.El
.It Fl s Ar slice
Set the default boot selection to
.Ar slice .
Values between 1 and 4 refer to slices; a value of 5 refers to the
option of booting from a second disk. This would normally be used in
conjunction with the
.Sq noupdate
option.
.It Fl t Ar ticks
Set the timeout value to
.Ar ticks .

23
usr.sbin/boot0cfg/boot0cfg.c
View File

@ -45,6 +45,7 @@ static const char rcsid[] =
#define MBRSIZE 512 /* master boot record size */
#define OFF_VERSION 0x1b0 /* offset: version number */
#define OFF_OPT 0x1b9 /* offset: default boot option */
#define OFF_DRIVE 0x1ba /* offset: setdrv drive */
#define OFF_FLAGS 0x1bb /* offset: option flags */
#define OFF_TICKS 0x1bc /* offset: clock ticks */
@ -93,17 +94,17 @@ main(int argc, char *argv[])
int boot0_size, mbr_size;
const char *bpath, *fpath, *disk;
int B_flag, v_flag, o_flag;
int d_arg, m_arg, t_arg;
int d_arg, m_arg, s_arg, t_arg;
int o_and, o_or;
int up, c;
bpath = "/boot/boot0";
fpath = NULL;
B_flag = v_flag = o_flag = 0;
d_arg = m_arg = t_arg = -1;
d_arg = m_arg = s_arg = t_arg = -1;
o_and = 0xff;
o_or = 0;
while ((c = getopt(argc, argv, "Bvb:d:f:m:o:t:")) != -1)
while ((c = getopt(argc, argv, "Bvb:d:f:m:o:s:t:")) != -1)
switch (c) {
case 'B':
B_flag = 1;
@ -127,6 +128,9 @@ main(int argc, char *argv[])
stropt(optarg, &o_and, &o_or);
o_flag = 1;
break;
case 's':
s_arg = argtoi(optarg, 1, 5, 's');
break;
case 't':
t_arg = argtoi(optarg, 1, 0xffff, 't');
break;
@ -138,7 +142,8 @@ main(int argc, char *argv[])
if (argc != 1)
usage();
disk = mkrdev(*argv);
up = B_flag || d_arg != -1 || m_arg != -1 || o_flag || t_arg != -1;
up = B_flag || d_arg != -1 || m_arg != -1 || o_flag || s_arg != -1
|| t_arg != -1;
/* open the disk and read in the existing mbr */
mbr_size = read_mbr(disk, &mbr, !B_flag);
@ -176,6 +181,10 @@ main(int argc, char *argv[])
boot0[OFF_FLAGS] |= o_or;
}
/* set the default boot selection */
if (s_arg != -1)
boot0[OFF_OPT] = s_arg - 1;
/* set the timeout */
if (t_arg != -1)
mk2(boot0 + OFF_TICKS, t_arg);
@ -285,6 +294,12 @@ display_mbr(u_int8_t *mbr)
printf("%s", opttbl[i].tok);
}
printf("\n");
printf("default_selection=F%d (", mbr[OFF_OPT] + 1);
if (mbr[OFF_OPT] < 4)
printf("Slice %d", mbr[OFF_OPT] + 1);
else
printf("Drive 1");
printf(")\n");
}
/*