UART, minicom and ASCII
I think you have a baud rate mismatch.

At 9600 baud, each bit should be ~104us wide. Here is an actual ASCII 5 on the scope with a single bit timed at 105us...



(note that ASCII 5 is a handy char for testing because it is alternating ones and zeros in binary)

At 9600 baud, a single byte should be ~833us wide (8 data bits, not counting start and stop)....



Your trace shows the same 8 bits taking ~300us,  so your serial clock is about 2.7x too fast. 

Try setting your baud rate in Minicom to 26656 baud and see what you get. If you see Ziga, then you can start looking for why the serial clock is too fast.