magicvar breaks tftp (or ramfs)

[Eric Bénard]

Hi Sascha,

Le Tue, 13 Dec 2011 20:26:06 +0100,
Sascha Hauer <s.hauer at pengutronix.de> a écrit :

> On Tue, Dec 13, 2011 at 04:09:53PM +0100, Eric Bénard wrote:
> > Hi Sascha,
> > 
> > Le 13/12/2011 10:48, Sascha Hauer a écrit :
> > >Sometimes it helps to enable
> > >
> > >CONFIG_KALLSYMS
> > >CONFIG_ARM_UNWIND
> > >
> > >to get a proper stack trace
> > >
> > Thanks for the hint I was not aware barebox also had these options.
> > 
> > The culprit is show_progress :
> > [<87f1c340>] (show_progress+0x14/0xf0) from [<87f1e590>] (tftp_send+0x194/0x1e4)
> > [<87f1e590>] (tftp_send+0x194/0x1e4) from [<87f1e784>] (do_tftpb+0x1a4/0x2d0)
> > [<87f1e784>] (do_tftpb+0x1a4/0x2d0) from [<87f065e0>] (execute_command+0x30/0x60)
> > [<87f065e0>] (execute_command+0x30/0x60) from [<87f03d4c>]
> > (run_list_real+0x7b4/0x894)
> > [<87f03d4c>] (run_list_real+0x7b4/0x894) from [<87f03350>]
> > (parse_stream_outer+0x104/0x1e4)
> > [<87f03350>] (parse_stream_outer+0x104/0x1e4) from [<87f03ed8>]
> > (run_shell+0x3c/0x5c)
> > [<87f03ed8>] (run_shell+0x3c/0x5c) from [<87f07870>] (start_barebox+0xe0/0x11c)
> > [<87f07870>] (start_barebox+0xe0/0x11c) from [<800011d8>] (0x800011d8)
> > 
> > And I get the problem with
> > arm-none-linux-gnueabi-gcc (Sourcery G++ Lite 2011.03-41) 4.5.2
> > it works with :
> > arm-none-linux-gnueabi-gcc (Sourcery G++ Lite 2010q1-202) 4.4.1
> > 
> > So that seems to be a toolchain issue (adding some printf in
> > show_progress make the problem disappear ...).
> 
> I really want to believe this, but I wouldn't be so sure. I think
> it's more likely that you found a bug in barebox that your new
> toolchain happens to trigger. Could you provide the objdump of
> show_progress along with a complete stack trace including register
> contents?
> 
here is the full trace.
There is something strange as it seems a wrong value gets loaded into R3
leading to the error.

Eric

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