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Old 08-08-2005, 06:57 PM   #1
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Registered: Aug 2005
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Linux 2.6.10 kgdb


I compiled the linux2.6.10 kernel in the development machine as per kgdb websites suggection and then transferred the image to the test machine. Now when I start gdb (in the dev machine) after booting the test host, I get the following error messages,

This GDB was configured as "i386-redhat-linux-gnu"...0xc014258b in ?? ()

(gdb) cont
Waiting for connection from remote gdb...
audit(1123541664.693:0): initialized
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[New Thread 1]

Program received signal SIGTRAP, Trace/breakpoint trap.
[Switching to Thread 1]
breakpoint () at kernel/kgdb.c:1453
1453 atomic_set(&kgdb_setting_breakpoint, 0);
(gdb) bt
#0 breakpoint () at kernel/kgdb.c:1453
#1 0xc0142525 in kgdb_panic_notify (self=0x1, cmd=0, ptr=0xc0404c80)
at kernel/kgdb.c:1310
#2 0xc01300d8 in notifier_call_chain (n=0x1, val=0, v=0xc0404c80)
at kernel/sys.c:172
#3 0xc0122a1a in panic (fmt=0xc0319668 "VFS: Unable to mount root fs on %s")
at kernel/panic.c:78
#4 0xc03c326d in mount_block_root (name=0xc0319e75 "/dev/root", flags=32769)
at init/do_mounts.c:306
#5 0xc03c349a in prepare_namespace () at init/do_mounts.c:407
#6 0xc01005e5 in init (unused=0x1) at init/main.c:729
#7 0xc01022b5 in kernel_thread_helper () at arch/i386/kernel/process.c:238

Any ideas?
Old 01-16-2006, 09:48 PM   #2
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Registered: May 2005
Location: bangalore
Posts: 7

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Problem why you are getting this message is you while booting up the board with kgdb linux kernel the options you gave in the boot command is wrong.

CFE> boot -z -elf devolpment_machine_ip:vmlinux 'root=/dev/nfs nfsroot=nfsroot_direcotry_path rw ip=target_machine_ipaddress'.

try this command this will solve your problem.

I have one query. Are you using null modem cable for kernel debugging . If so can you please tell me the configuration of it.



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