[U-Boot-Users] hang up after start_here
wd at denx.de
Mon Aug 18 10:39:27 CEST 2003
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 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.
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
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