On Fri, 14 May 2010, j.chitte wrote:
> --- In Jim Jackson <> wrote:
>>
>> It now boots, but after about 4 or 5 secs it starts constantly rebooting,
>> output below, along with board LEDs going fron steady green to red then
>> green, then red then green etc. The reset button has no effect.
>>
>> At first I thought it was the power supply developed a problem, so I've
>> tested with another PSU - same thing. I've disconnected everything
>> and still same problem.
>>
>> Anybody any suggestions at all as to what I might check for? If I'm quick I
>> can get maybe a couple of redboot commands executed, if anything will give
>> any diagnostic info.
...snipped...
>>
>> RedBoot>
>>
>>>> TS-BOOTROM, Rev 1.02 - built 16:55:24, Sep 14 2004
>>>> Copyright (C) 2004, Technologic Systems
>>>> TS-7200: Rev A PLD detected, options ( MAX197-ADC )
>>
>>
>>
>>>> TS-BOOTROM, Rev 1.02 - built 16:55:24, Sep 14 2004
>>>> Copyright (C) 2004, Technologic Systems
>>>> TS-7200: Rev A PLD detected, options ( MAX197-ADC )
>>
>> ....repeated over and over
>>
> If it is rebooting whilst being held static at the reboot prompt, it must
> be hardware. It definitely sounds like power brown-out triggering the
> reboot.
>
> Can you monitor the output of the onboard regulator?
Good point. I'll check.
It's a bit wierd. After a quick power cycle it starts the constant reboot
cycle after about 3 to 4 secs. If it is powered down for a while and then
powered up. the reboot cycle starts after about 5 to 7 secs. It could be
something heating up and failing.
The 3.3v and 1.8v regulators are linear on the 7200, so will be
dissipating heat.
cheers
Jim
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