Thanks for the quick replies.

I seem to have this working now.

At least on redhat-based distributions, this is what it took, early in rc.sysinit, to get the screen talking to me:


if [ ! -e /dev/ttyUSB0 ]; then
/bin/mknod --mode=660 /dev/ttyUSB0 c 188 0
if [ "$?" -eq "0" ]; then
echo ...

Hrm... I've been looking, and I can't find any information on setting up a USB port this way. I thought that USB connections were all auto-negotiated?

The LCD works fine once the system is fully booted, so there must be some kind of initialization happening, but I can't find anything in udev or ...

Hi, folks -

I'm trying to write some text out to this device via the /dev/ttyUSB0 path very early in the boot process of a CentOS Linux system that it's connected to.

I can access the device file, and if I echo some text out to it, it DOES affect the display - but the characters are just ...