Barebox fails to boot 1/40 boots...

[Vanhauwaert Wouter]

> -----Original Message-----
> From: Sascha Hauer [mailto:s.hauer at pengutronix.de]
> Sent: dinsdag 18 juni 2013 21:25
> To: Vanhauwaert Wouter
> Cc: barebox at lists.infradead.org
> Subject: Re: Barebox fails to boot 1/40 boots...
> 
> On Tue, Jun 18, 2013 at 02:59:57PM +0200, Vanhauwaert Wouter wrote:
> > Hello all,
> >
> > I have this issue with our custom design (IMX53, NAND, DDR3)
> >
> > Everything goes well most of the time, but now and then  the system does not
> boot and halts during initialization...
> > To be more specific, the function on which the system blocks is
> > 'setup_c()' in arch/arm/cpu/start-pbl.c
> >
> > What can I do more to debug this? This function is completely in assembler...
> 
> What makes you sure barebox stops there? Do you have DEBUG_LL enabled or
> do you use a JTAG debugger?
> 

Because these are real on/off tests (with which I mean with a relais which switches on/off every 10 seconds or so, a cold restart) I did not have the ability to test it with a debugger.
What I did was changing the LDO voltage from 1.2V to 1.3V and measure this with a scoop. When I put the adjustment right before this setup_c(), it goes well all the time (even when the board is blocked), 
when I put it after this setup_c(), it doesn't  get through when the board is blocked. So my assumption is it blocks in this function.

> Does this happen in first stage boot only or also when you chainload barebox
> from an already running barebox?

This is in a first stage boot...

> 
> You could try calling imx53_init_lowlevel_early from
> barebox_arm_reset_vector(). This *could* make a difference.
> 
> Since you are using v2013.05-stable you should have the following patches, but
> maybe it's worth rechecking.
> 
> 76820df ARM: invalidate data caches during early init
> f9d7582 ARM v7: added v7_mmu_cache_invalidate()
> ee5f859 ARM v7: v7_mmu_cache_flush(): do not restore r0-r3 (minor
> optimization) eb7d85c arm: properly init alignment trap bit
> 7904d90 ARM v7: fix mmu-off operation
> 9af1150 ARM: fix the memset fix
> 

I'll check

Grtz,
Wouter