Dead Serial on Hummingboard?

[Bernd Walter]

> Am 29.09.2017 um 00:07 schrieb Ian Lepore <ian at freebsd.org>:
> 
>> On Thu, 2017-09-28 at 23:52 +0200, Bernd Walter wrote:
>>> On Thu, Sep 28, 2017 at 11:25:36AM -0700, Russell Haley wrote:
>>> 
>>> My son was playing on my computer yesterday and I found my
>>> hummingboard on the floor this morning. It's not the first time
>>> it's
>>> hit the ground so I figured it was fine (lights are still on!).
>>> 
>>> I've tried to use the serial connection but it doesn't seem to be
>>> transmitting my keyboard input. I can see the kernel output all the
>>> way to login but it doesn't respond. ssh to the board works fine
>>> through Ethernet, and the ftdi cable works fine on my BBB. I've
>>> also
>>> tried two different kernels (r324055M, r321601M).
>>> 
>>> There doesn't apear to be any physical damage (solder on the pins
>>> looks okay) and I took the heatsink off and inspected the
>>> processor.
>>> It boots fine after I re-assembled, still no serial input.
>>> 
>>> Any  ideas? RIP hummingboard serial?
>> Does it output on the serial?
>> I'm not up to date with my iMX6 boards, but different boards used
>> different
>> iMX6 uarts for console port, so chances are that you are just on the
>> wrong
>> one.
>> 
> 
> Afaik, all imx6 boards use uart0 for serial console except Boundary
> Nitrogen series, which uses uart1.  In Russell's case, it was working
> fine until the board was dropped on the floor, and then input stopped
> working but output is still okay.

The marsboard also uses something else - uart1 or 2.
Havn‘t used my Hummingboards yet...
> 
> If it's not a problem with the input coming loose and being reconnected
> to the wrong pin on the hummingboard header, then it's hard to imagine
> what else the problem could be except a cracked solder joint from the
> fall.  You might need a microscope (or at least a jeweler's loupe) to
> see the damage.

Yes - that‘s unfortunate.
But if it is broken he could switch uart.
Requires a bit of work though, because uboot has to know.