[U-Boot-Users] Re: u-boot debugging boot with gdb and bdi2000 in lubbock(PXA255) board

Detlev Zundel dzu at denx.de
Tue Sep 9 15:24:52 CEST 2003

Hello Andrea,

> [u-boot-0.4.6]$ arm-linux-gdb u-boot
> GNU gdb 5.1.1
> Copyright 2002 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=arm-linux"...
> (gdb) target remote bdi:2001
> Remote debugging using bdi:2001
> 0x00000000 in ?? ()
> (gdb) symbol-file
> Discard symbol table from `/home/sorio/Devel/UBoot/u-boot-0.4.6/u-boot'? (y or n) y
> No symbol file now.
> (gdb) add-symbol-file u-boot 0x0
> add symbol table from file "u-boot" at
>         .text_addr = 0x0
> (y or n) y
> Reading symbols from u-boot...done.
> (gdb) b start_armboot
> Breakpoint 1 at 0x80000cb4: file board.c, line 214.
> (gdb) x/16i 0x0
> 0x0:    b       0x54
> 0x4:    ldr     pc, [pc, #20]   ; 0x20
> 0x8:    ldr     pc, [pc, #20]   ; 0x24
> 0xc:    ldr     pc, [pc, #20]   ; 0x28
> 0x10:   ldr     pc, [pc, #20]   ; 0x2c
> 0x14:   ldr     pc, [pc, #20]   ; 0x30
> 0x18:   ldr     pc, [pc, #20]   ; 0x34
> 0x1c:   ldr     pc, [pc, #20]   ; 0x38
> 0x20:   andmi   r0, r0, r0, lsl #2
> 0x24:   andmi   r0, r0, r0, ror #2
> 0x28:   andmi   r0, r0, r0, asr #3
> 0x2c:   andmi   r0, r0, r0, lsr #4
> 0x30:   andmi   r0, r0, r0, lsl #5
> 0x34:   andmi   r0, r0, r0, ror #5
> 0x38:   andmi   r0, r0, r0, asr #6
> 0x3c:   cdple   14, 10, cr11, cr13, cr15, {7}
> (gdb)
> The breackpoint is set to "0x80000cb4", so the bdi never stop!
> My code is built to run on 0x40000000 address.
> Any idea?

It is just something I seem to remember, but can you try to do the
symbol-file manipulations _before_ you give the "target remote"
command?  I know it sounds unlikely, but I think I stumbled across
something like this before.


Greenspun's Tenth Rule of Programming: "Any sufficiently complicated C
or Fortran program contains an ad-hoc, informally-specified bug-ridden
slow implementation of half of Common Lisp."

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