How are you testing this?
What are you connecting to the board?
Did you enable the UART on ttyMFD2 by using this thread: Using ttyMFD2 in linux userspace ?
Are you using a code or you are just sending data through the port?
Is there a relation between the number of bytes lost and the size of the package?
I was just reading that thread...when I do systemctl stop serial-getty@ttyMFD2.service I'm actually getting full data trough on multiple tries. Let me implement this properly, and see if that' solves it in full.
Using arduino breakout board, connected to pc.
sending data through port using putty or coolterm by copy/past. Coolterm also has an option to send data.
no relation. sometimes 1, sometimes 2, and sometimes 3 bytes lost. Always the first bytes.
also, when I first connect through terminal, i never get the prompt, i always have to press any key, and then get the prompt comes up for login.
I'm guessing it's the same issue.
i found a simple way to do it at http://stackoverflow.com/questions/21596384/cannot-disable-systemd-serial-getty-service
so it seems that all steps are:
systemctl stop serial-getty@ttyMFD2.service
systemctl mask serial-getty@ttyMFD2
this works for me so far.