[U-Boot-Users] U-boot not starting - sometimes

[U-Boot-Users] U-boot not starting - sometimes

[Martin Egholm Nielsen]

Hi,

We have encountered on some of our 405EP boards that when powered on 
nothing happens - U-boot doesn't start.
Powering off and trying again it "suddenly" works...

When caught in this "not-booting-state", it doesn't even help to 
activate the reset-pin. However, in the attached serial console, some 
giberish characters do come out (5-10 chars.).

Now, having seen problems with the memory chips on some of my boards, I 
was wondering if this could be a similar problem?

Best regards,
  Martin Egholm

[U-Boot-Users] U-boot not starting - sometimes

[Wolfgang Denk]

In message <dm6ggk$ut3$1@sea.gmane.org> you wrote:
> 
> Now, having seen problems with the memory chips on some of my boards, I 
> was wondering if this could be a similar problem?

Check your voltages (and their power-on sequence) and especially  the
clocks.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
"It may be that our role on this planet is not to worship God but  to
create him."                                       - Arthur C. Clarke

[U-Boot-Users] Re: U-boot not starting - sometimes

[Martin Egholm Nielsen]

Hi,

>>Now, having seen problems with the memory chips on some of my boards, I 
>>was wondering if this could be a similar problem?
> Check your voltages (and their power-on sequence) and especially  the
> clocks.
We have tried with two different power-up sequences, and have the same 
result...
Going even more OT: Do you actually know the most optimal powerup 
sequence for the 405EP? Because the datasheat doesn't specify...

Thx,
  Martin