[U-Boot-Users] hang up after start_here

Laurent Mohin laurent.mohin at acterna.com
Tue Aug 19 09:51:52 CEST 2003


thanks for your reply.
How can you bet that my initialization sequence is incomplete?
I remember you that it works on 15 boards out of 16. 


Wolfgang Denk <wd at denx.de>
Sent by: wd at denx.de
18/08/03 10:39

        To:     "Laurent Mohin" <laurent.mohin at acterna.com>
        cc:     linuxppc-embedded at lists.linuxppc.org, u-boot-users at lists.sourceforge.net
        Subject:        Re: [U-Boot-Users] hang up after start_here

In message 
<OFE8EA1A87.9A7B8A06-ONC1256D86.0028950A-C1256D86.002D5CE3 at se.wavetek.com> 
you wrote:
> I've debugged and found that the board hangs in start_here function and 
> doesn't reach the early_init function.
> Because the problem appears on only one of my boards out of 16, I 
> a hardware problem, and because it occurs just after mmu initialisation 
> and caches enabling, I suspect more especially sdram accesses.
> I want to know if anybody has encountered a similar problem and if the 
> diagnostic was the same.

This is a standard problem, which can show up in many forms.  My  bet
is  that  your  SDRAM initialization sequence is incomplete / broken.
Remember that it is NOT sufficient to set up the  mmeory  controller,
you must also intialize the SDRAM chips themself.

Best regards,

Wolfgang Denk

Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
"What is wanted is not the will to believe, but the will to find out,
which is the exact opposite." - Bertrand Russell, _Sceptical_Essays_,

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