[U-Boot] Raspberry Pi GPIO interacts with u-boot

[Simon Glass]

Hi Reza,

On 29 January 2015 at 14:03, Reza Nikoopour <rnikoopour at gmail.com> wrote:
> Hey guys,
>
> I'm working on setting up an NTP server using the following:
>
> Raspberry Pi Model B+
>>
> Raspberry PI GPS Add-on <
>> http://imall.iteadstudio.com/raspberry-pi-gps-add-on.html >
>> FreeBSD 10.1 (built with Crochet) <
>> https://github.com/kientzle/crochet-freebsd >
>>
> u-boot-pi < https://github.com/gonzoua/u-boot-pi >
>>
>
> I've run into a problem with u-boot.  If I boot the Pi without anything
> plugged into the GPIO port it boots all the way into FreeBSD.  However,
> when I try to boot with the GPS Add-on plugged into the GPIO, it does not
> boot past u-boot.
>
> When the GPS Add-on is plugged while booting the autoboot prompt shows
> saying "Press any key to abort autoboot" (or something to that effect)
> then the letter 'L' appears on the screen and starts moving from right to
> left erasing text it comes across then moving up to the next line.  When it
> reaches the top line the 'L' moves from the right side of the screen to the
> left and then wraps back around to the right indefinitely.

I think I had strange console things like this when U-Boot crashed. It
may be that there is a bug which is causing it to go into the weeds.
it could be that tstc() or getc() is causing this since it happens
while waiting for you to press a key..

I'm sorry that is not very helpful...

>
> My rpi_b.h config file can be found at <
> https://gist.github.com/rnikoopour/c4cfc271b4856816ee99 >.
>
> I thought this was an issue of the GPS Add-on input being read by the
> serial console as valid input.  I tried disabling the serial console by
> removing the UART console lines and adding < #define CONFIG_8xx_CONS_NONE
>>.  I also tried disabling the GPIO port by commenting out the GPIO section
> as well.
>
> Would anyone know why this is happening or how I can fix this?
>
Regards,
Simon