Date: Wed, 25 Apr 2001 21:15:06 -0700 From: "John W. De Boskey" <jwd@FreeBSD.org> To: Current List <freebsd-current@FreeBSD.org> Subject: 4.3-RELEASE will not boot after install (boot0 ?) Message-ID: <20010425211505.A15712@FreeBSD.org>
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Hi,
I have a Dell Optiplex GXi 200Mhz machine which will not
boot after installing 4.3-RELEASE. After rebooting, the normal
F1 FreeBSD prompt comes up with a beep. Pressing F1 causes
the machine to beep again. I believe the following code
sequence is the failure location:
/usr/src/sys/boot/i386/boot0/boot0.s
main.15: movw $LOAD,%bx # Address for read
movb $0x2,%ah # Read sector
callw intx13 # from disk
jc main.10 # If error
cmpw $MAGIC,0x1fe(%bx) # Bootable?
jne main.10 # No
where main.10 beeps... maybe we could have it beep twice
for a read err, once for a MAGIC error..
How I got here...
Sysinstall disk sequence:
Expert, delete existing partition, All, Quit, BootMgr, Auto,
quit, etc, etc..
The above sequence works fine and produces a bootable system
on other machines.
Anyways, after doing a expert install but before rebooting,
I can then go to the debug shell and get the following:
From df
Filesystem 512-blocks Used Avail Capacity Mounted on
/dev/md0c 5607 3819 1732 69% /
/dev/ad0s1a 198366 58206 124292 32% /mnt
/mnt/dev/ad0s1f 1676814 1211590 331080 79% /mnt/usr
/mnt/dev/ad0s1e 39630 234 36226 1% /mnt/var
/dev/cd0c 1317216 1317216 0 100% /dist
From dislabel -r ad0
# /dev/ad0c:
type: ESDI
disk: ad0s1
label:
flags:
bytes/sector: 512
sectors/track: 32
tracks/cylinder: 64
sectors/cylinder: 2048
cylinders: 1032
sectors/unit: 2115552
rpm: 3600
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0 # milliseconds
track-to-track seek: 0 # milliseconds
drivedata: 0
8 partitions:
# size offset fstype [fsize bsize bps/cpg]
a: 204800 0 4.2BSD 1024 8192 16 # (Cyl. 0 - 99)
b: 139376 204800 swap # (Cyl. 100 - 168*)
c: 2115552 0 unused 0 0 # (Cyl. 0 - 1032*)
e: 40960 344176 4.2BSD 1024 8192 16 # (Cyl. 168*- 188)
f: 1730416 385136 4.2BSD 1024 8192 16 # (Cyl. 188*- 1032*)
I have dumped the 1st 100 blocks of the disk. They are at:
http://people.freebsd.org/~jwd/noboot/bblocks.hd (hex dump)
http://people.freebsd.org/~jwd/noboot/bblocks (raw data)
the output from 'fdisk ad0' is:
http://people.freebsd.org/~jwd/noboot/fdisk
and the dmesg for the machine:
http://people.freebsd.org/~jwd/noboot/dmesg
The next thing I will try is a 'dd if=/dev/zero of=/dev/ad0 count=2'.
If this fixes the problem, it seems to indicate the install process has
a problem with existing fdisk partition information. If someone can
provide some pointers I'll try to figure what is going on.
Thanks,
John
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