[Gumstix-users] Overo Fire boot problems

[Iker <i.c...@bi...>]

We are having some problems in Overo Fire boot process. As I read in many
other posts, sometimes the system does not boot and  only the "40W" is
printed in the console.

We have a custom design with no signals into the overo until SYSEN is set to
high, as well as a weak pull-up in RXD3 pin (SYSEN-gated). Power supply is
between 3.3 and 3.4V, rise time 500us.

In these no-boot cases, the green led (power led) lights up, but not the
blue led D3 (that is TPS65950 LED_B). SYSEN i asserted high and the power
supply is OK.

I'd appreciate if  somebody can give me some advice on this topic.

As I can see in the PMIC ref manual, the last step in the power-on sequence
is not the assertiopn of SYSEN. After it, the HFCLKOUT starts working and
the NRESPWRON signal is asserted high. NRESPWRON is defined by TI as " the
reset signal delivered to the host processor at power-on reset (POR) when
the voltage core and input/output (I/O) are correctly set up". 

Is there any testpoint where I can see that signal?

Thanks.

Best regards,
Iker.



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