[U-Boot-Users] hang up after start_here

Laurent Mohin
2003-08-19T07:51:52Z

Wolfgang,

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.

Laurent

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

To: "Laurent Mohin" <laurent.mohin@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@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
suspect
> 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_,
1928