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Linux/AM3358: McSPI MOSI unusual waveform

Part Number: AM3358

Tool/software: Linux

the picture show transfer of 3 identical words. MOSI (red), CLK (blue)

echo 'zzz' | spi-pipe -d /dev/spidev1.0 -b 3

Similar problem with another board/SoC.

any help appreciated, thanks!