[U-Boot-Users] Sourcecode-debugging using BDI2000
"Häpe, Sebastian, HRD/AB"
sebastian.haepe at eads.com
Mon Mar 7 13:39:43 CET 2005
Hi @all!
Maybe this is a little bit off-topic, anyway I hope someone will help me...
The problem is the following:
I have a custom board and successfully ported U-Boot to load and start my
Linux kernel.
Now I want to use sourcecode-debugging with the BDI2000.
In the BDI2000-configuration I added the parameters described in the manual.
The kernel was compiled with the '-g' option in the $CPPFLAGS-variable, so
debugging-symbols should be included.
So I proceed this way:
1. Starting the board with U-Boot
2. Setting a HW-breakpoint at 0x10000 (kernel load-address)
3. Uncompressing and starting the kernel, I get the message "Tranferring
control to Linux (at 0x00010000)..."
4. After the BDI has stopped, I set the next breakpoint at 0xC012e8cc
(function 'MMU_init()') and let him run till that point
5. I run the gdb with the uncompressed image "vmlinux" and connect to the
BDI.
GDB tells me:
(gdb) target remote bdi:2001
MMU_init() at arch/ppc/mm/init.c:240
240 {
Current language: auto; currently c
(gdb)
So far it's fine, now I try to single-step a few times:
(gdb) s
MMU_init() at arch/ppc/mm/init.c:241
241 if (ppc_md.progress)
(gdb) s
240 {
(gdb) s
241 if (ppc_md.progress)
(gdb) s
245 MMU_setup();
(gdb) s
At this point, the BDI says: - TARGET: started and GDB does not react
anymore.
What could be the reason for the strange stepping behaviour?
In U-Boot I had to add a few compiler parameters to prevent him from jumping
around in the code.
Is it the same here and what are the parameters I have to add?
Some help (even ideas ;-) ) would be great.
Greetings,
Sebastian Häpe
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