[MinnowBoard] Need to disable both UART on LSE?

[Lucas De Marchi]

Hi,

Do I need to disable both UART1 and UART2 in UEFI in order to be able
to use pin 12 in the LSE (GPIO_UART1_RTS)?  If I disable only UART1 I
still can't use it:

[root at localhost ~]# echo 484 > /sys/class/gpio/export
[   11.943332] byt_gpio INT33FC:00: pin 74 cannot be used as GPIO.
-bash: echo: write error: Invalid argument

Pin 10 works fine though.

The only way I'm able to use pin 12 as GPIO is if I disable both UART1
*and* UART2.

Also I'm surprised I actually have to disable any of them since pin 12
is RTS. Wouldn't it be sufficient to disable flow control?

Here I have kernel 3.19.5 and firmware 0.77.  I also tried updating to
0.79 with no difference in behavior.


thanks

-- 
Lucas De Marchi