Installing 1.4.0-rc1 onto PCEngines APU6b4 with onboard drive causes the following messages:
GRUB loading. Welcome to GRUB!
No further comms on that serial port are observed, even after machine boots.
I can eventually log in via an ssh connection over ethernet, but there is now no path for rescuing this router.
Vyos config-mode displays:
show system console device ttyS0 { speed 115200 }
Permissions on ttys:
ls -l /dev/ttyS* crw--w---- 1 root tty 4, 64 Jan 8 16:46 /dev/ttyS0 crw-rw---- 1 root dialout 4, 65 Jan 8 16:17 /dev/ttyS1 crw-rw---- 1 root dialout 4, 66 Jan 8 16:17 /dev/ttyS2 crw-rw---- 1 root dialout 4, 67 Jan 8 16:17 /dev/ttyS3
The machine has an onboard serial to USB connector physically attached to ttyS0. The serial cable is actually a usb cable plugged into that connector. The setup worked in a previous version of 1.4-rolling.