KGDB on BookE

KGDB on BookE

[Prosun Niyogi]

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I've grabbed latest kernel.org kernel (2.6.11.11) to attempt to get a 
working kgdb on my ebony setup. Checking the mailing list archives, it 
seems as if all the 4xx specific kgdb patches have been merged with 
kernel.org. Is this the case? If so, I have a problem single stepping 
using kgdb. The debugger_sstep(regs) function is never called from 
traps.c. So, as of right now.. I can only set/hit an arbitrary breakpoint 
(for my testing, I've been setting a breakpoint at sys_sync). After 
setting the breakpoint and continuing from the initial kgdb entry point, 
gdb successfully catches the breakpoint at sys_sync, but when I attempt to 
step, the kernel continues normal operation, and subsequent attempts at 
breaking into gdb control by issuing a "sync" command on the ebony 
terminal in minicom do not hit the breakpoint. Any pointers/suggestions as 
to where I can obtain a working kgdb-enabled kernel for the ebony board? 
Any assistance would be helpful. 

Thanks.

Prosun Niyogi
Software Engineer 
Linux Technology Center
Phone:(512)838-8364 (TL 678-8364)
Fax:(512)838-4663
pniyogi@us.ibm.com

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Re: KGDB on BookE

[Geoff Levand]

Prosun Niyogi wrote:
> 
> I've grabbed latest kernel.org kernel (2.6.11.11) to attempt to get a
> working kgdb on my ebony setup. Checking the mailing list archives, it
> seems as if all the 4xx specific kgdb patches have been merged with
> kernel.org. Is this the case? If so, I have a problem single stepping
> using kgdb. The debugger_sstep(regs) function is never called from
> traps.c. So, as of right now.. I can only set/hit an arbitrary
> breakpoint (for my testing, I've been setting a breakpoint at sys_sync).
> After setting the breakpoint and continuing from the initial kgdb entry
> point, gdb successfully catches the breakpoint at sys_sync, but when I
> attempt to step, the kernel continues normal operation, and subsequent
> attempts at breaking into gdb control by issuing a "sync" command on the
> ebony terminal in minicom do not hit the breakpoint. Any
> pointers/suggestions as to where I can obtain a working kgdb-enabled
> kernel for the ebony board? Any assistance would be helpful.
> 

Apply the patches in CVS from http://sourceforge.net/projects/kgdb

This works with 2.6.11.11 and Ebony with both serial and Ether connections, 
but I found the kernel hangs with CONFIG_PREEMPT=y.

-Geoff