[Kgdb-bugreport] Problem of KGDB Implementation on PowerPC405 Board

[Zhou R. <van...@ya...>]

Hi, all
    I'm using ELDK4.1 for development on PowerPC405EP board, which is PPChameleonEVB. For kernel 2.6.19.2 provided with ELDK4.1, it seems no appropriate KGDB patch from http://kgdb.linsyssoft.com/ for this version of kernel. So I use the option:
Kernel hacking  --->
    [*] Include kgdb kernel debugger
                   Serial Port (ttyS0)  --->

While I'm using GDB to debug, I always got error message "Can't send signals to this remote system.  SIGILL not sent." as below. So is there any advice to solve this problem?
root@laz:/eldk41/ppc_4xx/usr/src/linux# ppc_4xx-gdb vmlinux
GNU gdb Red Hat Linux (6.3.0.0-1.21_3rh)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "--host=i386-redhat-linux --target=ppc-linux".
The target architecture is set automatically (currently powerpc:403)
..
(gdb) shell echo -e "\003" > /dev/ttyS0
(gdb) set remotebaud 115200
(gdb) target remote /dev/ttyS0
Remote debugging using /dev/ttyS0
breakinst () at arch/ppc/kernel/ppc-stub.c:825
825     }
(gdb) set logging on
Copying output to gdb.txt.
(gdb) l
820                     return;
821             }
822
823             asm("   .globl breakinst        \n\
824                  breakinst: .long 0x7d821008");
825     }
826
827     #ifdef CONFIG_KGDB_CONSOLE
828     /* Output string in GDB O-packet format if GDB has connected. If nothing
829        output, returns 0 (caller must then handle output). */
(gdb) break schedule
Breakpoint 1 at 0xc01a90a8: file kernel/sched.c, line 2960.
(gdb) c
Continuing.
(gdb) c
Continuing.
Can't send signals to this remote system.  SIGILL not sent.

Breakpoint 1, schedule () at kernel/sched.c:2960
2960            if (likely(!current->exit_state)) {
(gdb) l
2955            /*
2956             * Test if we are atomic.  Since do_exit() needs to call into
2957             * schedule() atomically, we ignore that path for now.
2958             * Otherwise, whine if we are scheduling when we should not be.
2959             */
2960            if (likely(!current->exit_state)) {
2961                    if (unlikely(in_atomic())) {
2962                            printk(KERN_ERR "scheduling while atomic: "
2963                                    "%s/0x%08x/%d\n",
2964                                    current->comm, preempt_count(), current->pid);

I also have tried to patch   KGDB 2.4 for 2.6.15.5 kernel on 2.6.15 provided with ELDK4.0. The patching procedure seems okay, but when I compile for PowerPC405 and 440 board, it always fails like this:
    For 405:
  CC      arch/ppc/syslib/gen550_dbg.o
  LD      arch/ppc/syslib/built-in.o
  AS      arch/powerpc/sysdev/dcr.o
  LD      arch/powerpc/sysdev/built-in.o
  CC      arch/powerpc/lib/bitops.o
  LD      arch/powerpc/lib/built-in.o
  CC      arch/ppc/platforms/4xx/ppchameleon.o
arch/ppc/platforms/4xx/ppchameleon.c: In function 'platform_init':
arch/ppc/platforms/4xx/ppchameleon.c:252: error: 'struct machdep_calls' has no member named 'early_serial_map'
make[1]: *** [arch/ppc/platforms/4xx/ppchameleon.o] Error 1
make: *** [arch/ppc/platforms/4xx] Error 2

    For 440:
  LD      arch/ppc/syslib/built-in.o
  CC      arch/powerpc/sysdev/indirect_pci.o
  AS      arch/powerpc/sysdev/dcr.o
  LD      arch/powerpc/sysdev/built-in.o
  CC      arch/powerpc/lib/bitops.o
  LD      arch/powerpc/lib/built-in.o
  CC      arch/ppc/platforms/4xx/yosemite.o
arch/ppc/platforms/4xx/yosemite.c: In function 'yosemite_early_serial_map':
arch/ppc/platforms/4xx/yosemite.c:288: warning: implicit declaration of function 'gen550_init'
arch/ppc/platforms/4xx/yosemite.c: In function 'platform_init':
arch/ppc/platforms/4xx/yosemite.c:349: error: 'struct machdep_calls' has no member named 'early_serial_map'
make[1]: *** [arch/ppc/platforms/4xx/yosemite.o] Error 1
make: *** [arch/ppc/platforms/4xx] Error 2
Would anyone like to give me some informaiton to solve this error?

Thanks a lot.


Best wishes

Zhou Rui
Distributed and Embedded System Lab
Room 532, Information Building
School of Information Science
       
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