Vijay Sampath wrote:
Sorry no idea. The configuration and options for kgdb are different in
my architecture. In make menuconfig, under "Kernel Hacking', I enable
kgdb and choose its serial port (ttyS0 or ttyS1). After this if I just
pass a string with "kgdb" in it in the commandline, it halts early on.
Looks like kgdb function is different in your architecture. You will
have to read the code that implements your kgdb setup. Clearly it is
not happy with the arguments you are passing it, as evident in the
output.
BTW I am using Linux kernel version 2.6.16 on a IBM405EP board. kgdb
breakpoint is setup in setup_arch() in arch/ppc/kernel/setup.c. Note I
also enabled CONFIG_WANT_EARLY_SERIAL in the processor configuration.
Not sure if this is important.
In my setup i have one serial port on the target(MPC8540) and one on
host(x86). The document(kgdb_docu_full-2.4.pdf) by default considers
having two serial ports(two on target and two on host).
Can anyone plz guide me how to proceed when i have only one serial port . ?
I want to know the initilization steps for estrablishing the serial
communication between kgdb(in target) and gdb on host. I tried one or
two ways but couldnot succeed.
Thanks
Sudheer
Vijay
On 12/30/06, sudheer <urwithsudheer@xxxxxxxxx> wrote:
Vijay, Thanks for the reply.
But before trying these options i want to clear one more issue.
While booting the kgdb kernel the kernel claims "kgdb initialisation
failure." I have observed it very lately.
Memory CAM mapping: CAM0=256Mb, CAM1=0Mb, CAM2=0Mb residual: 0Mb
Linux version 2.6.15.5 (root@Sudheer) (gcc version 3.4.4) #2 Fri Dec
29 17:58:40 IST
2006
KGDB cannot initialize I/O yet.
Invalid syntax for option kgdb8250=
Malformed early option 'kgdb8250'
Built 1 zonelists
Kernel command line: console=ttyS0,115200 root=/dev/ram rw kgdbwait
kgdb8250=0,115200
OpenPIC Version 1.2 (1 CPUs and 60 IRQ sources) at fcfbb000
PID hash table entries: 2048 (order: 11, 32768 bytes)
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
I have changed the kgdb8250 arg to 1,0, but the result is same.
And ......
I have checked the serial cable NULL Mode connecting x86 systems
serially- with Cat and echo and this is fine.
When i try with Unpatched kernel on target and host(x86) - cat <
/dev/ttyS0 doesnt wait and returns to prompt.
I tried with 2.6.13 and 2.6.15.5 with resepective kgdb patches, but the
result is same (kgdb Initialization failure). I am not sure where am
doing the mistake.
Please guide me in right way and also please let me know if any more
details are required.
Happy New Year in Advance.
Thanks
Sudheer
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