Dobrica Pavlinušić's random unstructured stuff
LXD8541: Revision 3
https://forum.doozan.com/read.php?2,12096

^ serial

https://forum.doozan.com/read.php?2,67954,76099#msg-76099

Koen Re: Debian on Chip PC LXD8941 January 04, 2019 02:33PM

Inside there is both a 4 pin and a 6 pin header. The 4 pin is the UART connection. With the power button towards you and the DVI connection away from you the connections are as follows: GND, TX, RX, VCC (from left to right).

^^ serial booting

https://forum.doozan.com/read.php?3,7852,7852