[U-Boot-Users] Debugging u-boot after relocation - add-symbol-file issues with gdb 6.4

Laurent Pinchart laurent.pinchart at tbox.biz
Mon May 8 11:36:44 CEST 2006

> > After reading the mailing list archive I found out about the
> > add-symbol-file gdb command. I've been able to add symbol files from the
> > u-boot image relative to the relocated address. gdb prints the correct
> > relocated location when asked for the address of a symbol. Unfortunately,
> > it isn't able to display source code when stepping through the software.
> > The file in which the function at the current PC value seems to be found
> > correctly, but gdb will always display the first line of code in that
> > file. That's probably because the relocated address is lower than the
> > first line of code address before relocation. gdb should have (at least
> > in my opinion) updated the debug symbols, but it doesn't seem to have
> > done so.
> >
> > Is there something I've done wrong, or is that a gdb bug ? Does anyone
> > know of a workaround ?
> Sounds like a toolchain problem to me. For a test, try the GDB that
> comes with the ELDK.

That works much better. Not sure if a patch in the ELDK fixes the problem or 
if this was a regression introduced in GDB 6.4. I had upgraded from 6.3 to 
6.4 because of another issue (GDB printed <signal handler called> instead of 
source lines when stepping through code in remote mode) which seems to have 
been fixed by the ELDK patches.

Thanks for your help.

Best regards,

Laurent Pinchart

More information about the U-Boot mailing list