Hi, uart4 on banapipro is a very common uart since it's located at the standard uart in raspberry B+ J8's pinout [1] I installed debian based on [2] via sd card. For further testing I connected a uart<->USB cable. The cable worked perfectly on the "console" header ttyS0. It seems to me that the function uart4 is not set in the pinctrl: cat /sys/kernel/debug/pinctrl/1c20800.pinctrl/pinmux-pins |grep uart pin 54 (PB22): 1c28000.serial (GPIO UNCLAIMED) function uart0 group PB22 pin 55 (PB23): 1c28000.serial (GPIO UNCLAIMED) function uart0 group PB23 pin 272 (PI16): 1c28800.serial (GPIO UNCLAIMED) function uart2 group PI16 pin 273 (PI17): 1c28800.serial (GPIO UNCLAIMED) function uart2 group PI17 pin 274 (PI18): 1c28800.serial (GPIO UNCLAIMED) function uart2 group PI18 pin 275 (PI19): 1c28800.serial (GPIO UNCLAIMED) function uart2 group PI19 pin 276 (PI20): 1c29c00.serial (GPIO UNCLAIMED) function uart7 group PI20 pin 277 (PI21): 1c29c00.serial (GPIO UNCLAIMED) function uart7 group PI21 Am I missing a something? How can I activate the group? Kind regards, Bernhard [1] http://forum.lemaker.org/forum.php?mod=viewthread&tid=10852&fromuid=1602 [2] https://wiki.debian.org/InstallingDebianOn/Allwinner#Installing_from_an_SD_card_image
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