KGDB8250 doesn't hit KGDB breakpoint in PowerPC-440

KGDB8250 doesn't hit KGDB breakpoint in PowerPC-440

[srikanth krishnakar]

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Hi all,

I am using KGDB on powerpc-440. This is tested on* Linux-2.6.27*, the
following arguments to KGDB showing init_delay of 8250 as shown below:

Target Side :

-----------------------------

Linux/PowerPC load: console=ttyS0 ip=bootp root=/dev/nfs rw
kgdb8250=ttyS0,9600 kgdbwait
Finalizing device tree... flat tree at 0x5ad300

*kgdb8250: ttyS0 init delayed, use io/mmio/mbase syntax for early init.
*
.....
.....
.......
......
......
.......
......
console [ttyS0] enabled
kgdb: Registered I/O driver kgdb8250.

Stops here ->
-------------------------------

Host Side:

(gdb) target remote
/dev/ttyS0
Remote debugging using
/dev/ttyS0
0xc01a760c in mem_serial_in (p=0xc036e050, offset=<value optimized
out>)
    at /opt/linux-2.6.29/arch/powerpc/include/asm/io.h:153
153     DEF_MMIO_IN_BE(in_8,     8, lbz);

(gdb) info threads
14 Thread 109 (nfsiod)  __switch_to (prev=<value optimized out>,
new=0xcf8227f0) at arch/powerpc/kernel/process.c:412
  13 Thread 108 (aio/0)  __switch_to (prev=<value optimized out>,
new=0xcf8227f0) at arch/powerpc/kernel/process.c:412
  12 Thread 107 (kswapd0)  __switch_to (prev=<value optimized out>,
new=0xcf8227f0) at arch/powerpc/kernel/process.c:412
  11 Thread 106 (pdflush)  __switch_to (prev=<value optimized out>,
new=0xcf8227f0) at arch/powerpc/kernel/process.c:412
  10 Thread 105 (pdflush)  __switch_to (prev=<value optimized out>,
new=0xcf8227f0) at arch/powerpc/kernel/process.c:412


********************
But when I say Continue -> <Got the Error as below >

(gdb) c
Continuing.
*warning: Remote failure reply: E22    *

------------------------

Can anybody correct me, where I am going wrong. I am not able to hit KGDB
breakpoint. ?



-- 
Regards
Srikanth Krishnakar
**********************

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Re: KGDB8250 doesn't hit KGDB breakpoint in PowerPC-440

[srikanth krishnakar]

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Hi,

The simple" config is deprecated , when the MMIO support was added
to the KGDB 8250 driver. I have to use the syntax:

kgdb8250=<io or mmio>,<address>,<baud rate>,<irq>

Thanks
Srikanth


On Sat, Mar 28, 2009 at 8:40 PM, srikanth krishnakar
<skrishnakar@gmail.com>wrote:

> Hi all,
>
> I am using KGDB on powerpc-440. This is tested on* Linux-2.6.27*, the
> following arguments to KGDB showing init_delay of 8250 as shown below:
>
> Target Side :
>
> -----------------------------
>
> Linux/PowerPC load: console=ttyS0 ip=bootp root=/dev/nfs rw
> kgdb8250=ttyS0,9600 kgdbwait
> Finalizing device tree... flat tree at 0x5ad300
>
> *kgdb8250: ttyS0 init delayed, use io/mmio/mbase syntax for early
> init.     *
> .....
> .....
> .......
> ......
> ......
> .......
> ......
> console [ttyS0] enabled
> kgdb: Registered I/O driver kgdb8250.
>
> Stops here ->
> -------------------------------
>
> Host Side:
>
> (gdb) target remote
> /dev/ttyS0
> Remote debugging using
> /dev/ttyS0
> 0xc01a760c in mem_serial_in (p=0xc036e050, offset=<value optimized
> out>)
>     at /opt/linux-2.6.29/arch/powerpc/include/asm/io.h:153
> 153     DEF_MMIO_IN_BE(in_8,     8, lbz);
>
> (gdb) info threads
> 14 Thread 109 (nfsiod)  __switch_to (prev=<value optimized out>,
> new=0xcf8227f0) at arch/powerpc/kernel/process.c:412
>   13 Thread 108 (aio/0)  __switch_to (prev=<value optimized out>,
> new=0xcf8227f0) at arch/powerpc/kernel/process.c:412
>   12 Thread 107 (kswapd0)  __switch_to (prev=<value optimized out>,
> new=0xcf8227f0) at arch/powerpc/kernel/process.c:412
>   11 Thread 106 (pdflush)  __switch_to (prev=<value optimized out>,
> new=0xcf8227f0) at arch/powerpc/kernel/process.c:412
>   10 Thread 105 (pdflush)  __switch_to (prev=<value optimized out>,
> new=0xcf8227f0) at arch/powerpc/kernel/process.c:412
>
>
> ********************
> But when I say Continue -> <Got the Error as below >
>
> (gdb) c
> Continuing.
> *warning: Remote failure reply: E22    *
>
> ------------------------
>
> Can anybody correct me, where I am going wrong. I am not able to hit KGDB
> breakpoint. ?
>
>
>
> --
> Regards
> Srikanth Krishnakar
> **********************
>



-- 
"The Good You Do, The Best You GET"

Regards
Srikanth Krishnakar
**********************

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