Le Monday 24 August 2015, Graham a écrit :
> There is a compromise between the value of the resistors used for boot
> programming,
> and the permanent load they put on the I/O system during operational I/O.
>
> So, yes, you can lower the value of the programming resistors, if it
> both solves your
> boot problem, and does not disturb the way the I/O works when the system
> is in normal
> operation. At some point it will. The output drive capability of the
> GPIO on the Sitara
> is limited. Make sure you understand it.
>
> And make sure you are allowing for noise margin on both the boot logic
> signals and your
> operating logic signals. A battery powered motor and servo system can
> have a lot of
> electrical noise, both on the power and the ground system. If you have
> system noise
> getting into the boot and control logic, you end up with intermittent
> problems that
> are extremely hard to debug.
Thanks for the advices! I'll make some tests.
--
Frédéric
--
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