Fatih Alparslan

Hello Armbian Team I have one banana pi r2 pro board(https://wiki.banana-pi.org/Banana_Pi_BPI-R2_Pro). I used Armbian_community_24.5.0-trunk.667_Bananapir2pro_bookworm_current_6.6.31_minimal.img(https://github.com/armbian/community/releases/download/24.5.0-trunk.667/Armbian_community_24.5.0-trunk.667_Bananapir2pro_bookworm_current_6.6.31_minimal.img.xz) . I want to use 4 serial port. But when I tried to "cat" command, it gives Input/output error. I tried to screen too but it terminated immediately. it can see there is 7 uart interface ,but only ttyS2 works, for terminal how can I use other uart interfaces. :~# ls -l /dev/ttyS* crw-rw---- 1 root dialout 4, 64 May 24 14:17 /dev/ttyS0 crw-rw---- 1 root dialout 4, 65 May 24 14:17 /dev/ttyS1 crw------- 1 root tty 4, 66 May 24 14:22 /dev/ttyS2 crw-rw---- 1 root dialout 4, 67 May 24 14:17 /dev/ttyS3 crw-rw---- 1 root dialout 4, 68 May 24 14:17 /dev/ttyS4 crw-rw---- 1 root dialout 4, 69 May 24 14:17 /dev/ttyS5 crw-rw---- 1 root dialout 4, 70 May 24 14:17 /dev/ttyS6 crw-rw---- 1 root dialout 4, 71 May 24 14:17 /dev/ttyS7 Thanks, Best regards