getting second serial port available
11-10-2023, 12:05 AM
I'm trying to get the second serial port working (/dev/ttyS2) on a PINE64-LTS board.
I created and edited the DTS file as @martinayotte posted a while back (https://forum.pine64.org/showthread.php?...ight=ttyS2).
But it didn't seem to work. I am using a logic analyzer to monitor the signals and getting NO data. I am using a simple C program to open and write to the port. the write reports its writing data.
in /boot/dtb/allwinner I modified the "-lts.dtb" file
-rw-r--r-- 1 root root 41859 Feb 17 2023 sun50i-a64-pine64.dtb
-rw-rw-r-- 1 root root 41973 Nov 1 13:20 sun50i-a64-pine64-lts.dtb
-rw-r--r-- 1 root root 41909 Feb 17 2023 sun50i-a64-pine64-lts-dtb-backup
-rw-r--r-- 1 root root 41981 Feb 17 2023 sun50i-a64-pine64-plus.dtb
Is there a way to confirm
a) which DTB file the system is actually using, or
b) that the "okay" on that serial port is enabling the mux mapping for those pins?
Thanks in advance.
I created and edited the DTS file as @martinayotte posted a while back (https://forum.pine64.org/showthread.php?...ight=ttyS2).
But it didn't seem to work. I am using a logic analyzer to monitor the signals and getting NO data. I am using a simple C program to open and write to the port. the write reports its writing data.
in /boot/dtb/allwinner I modified the "-lts.dtb" file
-rw-r--r-- 1 root root 41859 Feb 17 2023 sun50i-a64-pine64.dtb
-rw-rw-r-- 1 root root 41973 Nov 1 13:20 sun50i-a64-pine64-lts.dtb
-rw-r--r-- 1 root root 41909 Feb 17 2023 sun50i-a64-pine64-lts-dtb-backup
-rw-r--r-- 1 root root 41981 Feb 17 2023 sun50i-a64-pine64-plus.dtb
Is there a way to confirm
a) which DTB file the system is actually using, or
b) that the "okay" on that serial port is enabling the mux mapping for those pins?
Thanks in advance.
