add-symbol-file question

vb
2007-11-20T00:50:41Z

Greetings,

I am trying to debug very early stages of bringing up a ppc82xx
kernel. (it's not relevant. but just in case: I'm using a bdi2000)

For some reason gdb fails to read the symbol table such that the text
segment is placed at 0:

vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
(gdb) show version
GNU gdb 6.5
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This GDB was configured as "--host=i686-pc-linux-gnu
--target=powerpc-8540-linux-gnu".
(gdb) sym
Discard symbol table? (y or n) y
No symbol file now.
(gdb) add-symbol-file ../build/linux-2.6-lb4-powerpc/vmlinux 0x40000000
add symbol table from file "../build/linux-2.6-lb4-powerpc/vmlinux" at
.text_addr = 0x40000000
(y or n) y
Reading symbols from
/local/vb/projects/vanilla-wt/build/linux-2.6-lb4-powerpc/vmlinux...done.
(gdb) p __start
$7 = {<text variable, no debug info>} 0x4000000c <__start>
(gdb) sym
Discard symbol table? (y or n) y
No symbol file now.
(gdb) add-symbol-file ../build/linux-2.6-lb4-powerpc/vmlinux 0x00000000
add symbol table from file "../build/linux-2.6-lb4-powerpc/vmlinux" at
.text_addr = 0x0
(y or n) y
Reading symbols from
/local/vb/projects/vanilla-wt/build/linux-2.6-lb4-powerpc/vmlinux...done.
(gdb) p __start
$8 = {<text variable, no debug info>} 0x8000000c <__start>
(gdb)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

I tried loading it at different offsets, anything else but 0 works
just fine, anyone knows what's wrong?!

TIA,
/vb