[PATCH v2 3/3] bsps/microblaze: Fix UART transmit interrupt

[Sebastian Huber]

Feel free to check in this patch. I just have a side note. I tried to 
write a Termios interrupt driver for a FIFO device some time ago:

bsps/arm/imx/console/console-config.c

It worked only without gaps because the device offered the ability to 
get the current FIFO level. Waiting for the FIFO to get completely empty 
resulted in transmission gaps sometimes.

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