Date: Wed, 31 May 2000 23:17:36 +0100 (BST) From: iedowse@maths.tcd.ie To: FreeBSD-gnats-submit@freebsd.org Subject: i386/18923: boot0cfg(8) cannot select default boot slice Message-ID: <200005312317.aa66969@walton.maths.tcd.ie>
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>Number: 18923
>Category: i386
>Synopsis: boot0cfg(8) cannot select default boot slice
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed May 31 15:20:02 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator: Ian Dowse
>Release: FreeBSD 3.4-STABLE i386
>Organization:
School of Mathematics
Trinity College, Dublin
>Environment:
FreeBSD 3.x, 4.x or 5.0-current
>Description:
boot0cfg(8) currently has no way to select the default boot
slice. Having such a mechanism is useful when boot0 is used
with the `noupdate' option. Since turning on `noupdate'
for the first time requires booting FreeBSD (which makes
FreeBSD the default), there is no direct way to make some
non-FreeBSD partition the permanent default.
[Indirect ways to achieve this which do work include booting
FreeBSD from a floppy or CDROM (so as not to disturb the current
default slice) and then running boot0cfg, or manually editing
the byte at offset 0x1b9 in the MBR.]
The patch included below adds a new `-s' option to boot0cfg
that allows the default boot slice to be configured.
>How-To-Repeat:
- Take a disk with two slices:
F1 Dos
F2 FreeBSD
- Attempt to make "F1 Dos" the permanent default, so it will
always be the default regardless of the last selection made.
- Discover that in order to run "boot0cfg -o noupdate", one must
first boot FreeBSD. Running "boot0cfg -o noupdate" then makes
"F2 FreeBSD" the permanent default.
>Fix:
Apply the following patch in src/usr.sbin/boot0cfg.
Index: boot0cfg.8
===================================================================
RCS file: /FreeBSD/FreeBSD-CVS/src/usr.sbin/boot0cfg/boot0cfg.8,v
retrieving revision 1.5
diff -u -r1.5 boot0cfg.8
--- boot0cfg.8 1999/08/28 01:15:38 1.5
+++ boot0cfg.8 2000/05/31 21:37:19
@@ -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 @@
.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 .
Index: boot0cfg.c
===================================================================
RCS file: /FreeBSD/FreeBSD-CVS/src/usr.sbin/boot0cfg/boot0cfg.c,v
retrieving revision 1.7
diff -u -r1.7 boot0cfg.c
--- boot0cfg.c 1999/08/28 01:15:38 1.7
+++ boot0cfg.c 2000/05/31 21:45:08
@@ -44,6 +44,7 @@
#define MBRSIZE 512 /* master boot record size */
+#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 */
@@ -89,17 +90,17 @@
const char *bpath, *fpath, *disk;
ssize_t n;
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 fd, fd1, up, c, i;
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;
@@ -123,6 +124,9 @@
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;
@@ -134,7 +138,8 @@
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;
if ((fd = open(disk, up ? O_RDWR : O_RDONLY)) == -1)
err(1, "%s", disk);
if ((n = read(fd, buf, MBRSIZE)) == -1)
@@ -174,6 +179,8 @@
buf[OFF_FLAGS] &= o_and;
buf[OFF_FLAGS] |= o_or;
}
+ if (s_arg != -1)
+ buf[OFF_OPT] = s_arg - 1;
if (t_arg != -1)
mk2(buf + OFF_TICKS, t_arg);
if (up) {
@@ -211,6 +218,12 @@
printf("%s", opttbl[i].tok);
}
printf(" ticks=%u\n", cv2(buf + OFF_TICKS));
+ printf("default_selection=F%d (", buf[OFF_OPT] + 1);
+ if (buf[OFF_OPT] < 4)
+ printf("Slice %d", buf[OFF_OPT] + 1);
+ else
+ printf("Drive 1");
+ printf(")\n");
}
return 0;
}
@@ -316,6 +329,6 @@
{
fprintf(stderr, "%s\n%s\n",
"usage: boot0cfg [-Bv] [-b boot0] [-d drive] [-f file] [-m mask]",
- " [-o options] [-t ticks] disk");
+ " [-o options] [-s slice] [-t ticks] disk");
exit(1);
}
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