Date: Mon, 16 Dec 1996 11:46:19 +0000 () From: "Lenzi, Sergio" <lenzi@bsi.com.br> To: Karl Wagner <karl@host.softronex.com> Cc: questions@FreeBSD.ORG Subject: Re: Bootable Disk Message-ID: <Pine.BSF.3.91.961216113831.493C-100000@sergio> In-Reply-To: <Pine.BSF.3.91.961213142132.9950A-100000@host.softronex.com>
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On Fri, 13 Dec 1996, Karl Wagner wrote:
>
> Hi:
>
> I have a single question. Is is posible to create a 1.44 bootable disk
> that holds a compressed ( or regular ) kernel and a small file system so
> that FreeBSD could run without a hard disk for very small applications?.
>
Yes you can build an entire filesystem in memory using the mfs option
and a "crunch" feature to put the whole thing in memory like the bootdisk
from WC.
You need:
the system sources (from the cd directory dist/src)
-----------config file------------
machine "i386"
cpu "I386_CPU"
cpu "I486_CPU"
cpu "I586_CPU"
cpu "I686_CPU"
ident GENERIC
maxusers 10
options MATH_EMULATE #Support for x87 emulation
options INET #Internetworking
options FFS #Berkeley Fast Filesystem
options MFS
options SCSI_DELAY=15 #Be pessimistic about Joe SCSI device
options BOUNCE_BUFFERS #include support for DMA bounce buffers
options UCONSOLE #Allow users to grab the console
options FAILSAFE #Be conservative
options MAXCONS=4
options MFS_ROOT=2000
options MFS_AUTOLOAD
config kernel root on wd0
controller isa0
controller eisa0
controller pci0
controller fdc0 at isa? port "IO_FD1" bio irq 6 drq 2 vector fdintr
disk fd0 at fdc0 drive 0
disk fd1 at fdc0 drive 1
controller wdc0 at isa? port "IO_WD1" bio irq 14 flags 0x80ff80ff vector wdintr
disk wd0 at wdc0 drive 0
disk wd1 at wdc0 drive 1
controller ncr0
controller ahc0
controller uha0 at isa? port "IO_UHA0" bio irq ? drq 5 vector uhaintr
controller aha0 at isa? port "IO_AHA0" bio irq ? drq 5 vector ahaintr
controller aic0 at isa? port 0x340 bio irq 11 vector aicintr
controller nca0 at isa? port 0x1f88 bio irq 10 vector ncaintr
controller nca1 at isa? port 0x350 bio irq 5 vector ncaintr
controller scbus0
device sd0
# syscons is the default console driver, resembling an SCO console
device sc0 at isa? port "IO_KBD" tty irq 1 vector scintr
# Enable this and PCVT_FREEBSD for pcvt vt220 compatible console driver
# Mandatory, don't remove
device npx0 at isa? port "IO_NPX" irq 13 vector npxintr
pseudo-device loop
pseudo-device gzip # Exec gzipped a.out's
pseudo-device vn
----------------dofs.sh---------------------------
:
#set -ex
VNDEVICE=vn0
export BLOCKSIZE=512
MNT=/mnt
FSSIZE=2000
FSPROTO=fs
FSINODE=4000
FSIMAGE=fs-image
rm -f $FSIMAGE
if [ ! -b /dev/${VNDEVICE} -o ! -c /dev/r${VNDEVICE} ] ; then
( cd /dev && sh MAKEDEV ${VNDEVICE} )
fi
umount /dev/${VNDEVICE} 2>/dev/null || true
umount ${MNT} 2>/dev/null || true
vnconfig -u /dev/r${VNDEVICE} 2>/dev/null || true
dd of=$FSIMAGE if=/dev/zero count=${FSSIZE} bs=1k 2>/dev/null
# this suppresses the `invalid primary partition table: no magic'
awk 'BEGIN {printf "%c%c", 85, 170}' |\
dd of=$FSIMAGE obs=1 seek=510 conv=notrunc 2>/dev/null
vnconfig -s labels -c /dev/r${VNDEVICE} $FSIMAGE
sed '/^minimum:/,$d' /etc/disktab > /etc/disktab.tmp
cat /etc/disktab.tmp > /etc/disktab
rm -f /etc/disktab.tmp
(
a=`expr ${FSSIZE} \* 2`
echo "minimum:ty=mfs:se#512:nt#1:rm#300:\\"
echo " :ns#$a:nc#1:\\"
echo " :pa#$a:oa#0:ba#4096:fa#512:\\"
echo " :pc#$a:oc#0:bc#4096:fc#512:"
) >> /etc/disktab
disklabel -w -r -B \
-b /usr/mdec/fdboot \
-s /usr/mdec/bootfd \
/dev/r${VNDEVICE} minimum
newfs -u 0 -t 0 -i ${FSINODE} -m 0 -o space /dev/r${VNDEVICE}a
mount /dev/${VNDEVICE}a ${MNT}
( set -e && cd ${FSPROTO} && find . -print | cpio -dump ${MNT} )
set `df -i /mnt | tail -1`
umount ${MNT}
fsck -p /dev/r${VNDEVICE}a < /dev/null
vnconfig -u /dev/r${VNDEVICE} 2>/dev/null || true
echo ${FSSIZE} > size
echo ">>> Filesystem is ${FSSIZE} K, $4 left"
echo ">>> ${FSINODE} bytes/inode, $7 left"
echo ">>> `expr ${FSSIZE} \* 1024 / ${FSINODE}`"
----------------config file for the "crunch" command-----------
srcdirs /usr/src/sbin/i386
srcdirs /usr/src/sbin
srcdirs /usr/src/bin
srcdirs /usr/src/gnu/usr.bin
srcdirs /usr/src/usr.sbin
srcdirs /usr/src/usr.bin
progs swapon gzip chroot ln cpio pwd dialog
progs expr awk grep tput newfs bc df sync init echo test sh cp
progs ls mkdir tar mount umount rm cat
progs reboot rmdir env stty sleep fdisk disklabel find
special nvi srcdir /usr/src/usr.bin/vi/common
ln test [
ln sh -sh
ln nvi vi
ln reboot halt
libs /usr/src/lib/libc/libc.a
libs -lipx -lgnuregex -lm
libs -lcrypt -lkvm -ll -ledit -lutil -ldialog -lncurses -lmytinfo
-------------------write-mfs.c-----------
/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
* $Id: write_mfs_in_kernel.c,v 1.1 1995/04/25 03:45:18 phk Exp $
*
* This program patches a filesystem into a kernel made with MFS_ROOT
* option.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <ufs/ffs/fs.h>
main(int argc, char **argv)
{
unsigned char *buf_kernel, *buf_fs, *p,*q;
int fd_kernel, fd_fs;
struct stat st_kernel, st_fs;
u_long l;
if (argc < 3) {
fprintf(stderr,"Usage:\n\t%s kernel fs\n",argv[0]);
exit(2);
}
fd_kernel = open(argv[1],O_RDWR);
if (fd_kernel < 0) { perror(argv[1]); exit(2); }
fstat(fd_kernel,&st_kernel);
fd_fs = open(argv[2],O_RDONLY);
if (fd_fs < 0) { perror(argv[2]); exit(2); }
fstat(fd_fs,&st_fs);
buf_kernel = malloc(st_kernel.st_size);
if (!buf_kernel) { perror("malloc"); exit(2); }
buf_fs = malloc(st_fs.st_size);
if (!buf_fs) { perror("malloc"); exit(2); }
if (st_kernel.st_size != read(fd_kernel,buf_kernel,st_kernel.st_size))
{ perror(argv[1]); exit(2); }
if (st_fs.st_size != read(fd_fs,buf_fs,st_fs.st_size))
{ perror(argv[2]); exit(2); }
for(l=0,p=buf_kernel; l < st_kernel.st_size - st_fs.st_size ; l++,p++ )
if(*p == 'M' && !strcmp(p,"MFS Filesystem goes here"))
goto found;
fprintf(stderr,"MFS filesystem signature not found in %s\n",argv[1]);
exit(1);
found:
for(l=0,q= p + SBOFF; l < st_fs.st_size - SBOFF ; l++,q++ )
if (*q)
goto fail;
memcpy(p+SBOFF,buf_fs+SBOFF,st_fs.st_size-SBOFF);
lseek(fd_kernel,0L,SEEK_SET);
if (st_kernel.st_size != write(fd_kernel,buf_kernel,st_kernel.st_size))
{ perror(argv[1]); exit(2); }
exit(0);
fail:
l += SBOFF;
fprintf(stderr,"Obstruction in kernel after %ld bytes (%ld Kbyte)\n",
l, l/1024);
fprintf(stderr,"Filesystem is %ld bytes (%ld Kbyte)\n",
(u_long)st_fs.st_size, (u_long)st_fs.st_size/1024);
exit(1);
}
--------------------------------
Hope this can help.
Sergio Lenzi.
Unix consult.
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