A few weeks back I posted to a thread about using an LCD display on
the slug. I was especially interested in how I might install a
Pertelian USB LCD display on my slug, which runs Unslung; the existing
wiki howto is for OpenSlug, and there's currently no Unslung package
for lcdproc (which would control the display).
Another post in the thread suggests that an Unslung user would
probably have to compile lcdproc themselves, so I thought I'd see if I
could do this, even if I don't actually own a Pertelian yet. (This is
because if the compile didn't work, there would be less point for me
in buying one, though I have another Linux PC which I could try it with.)
Here is what I've done so far - some steps are adapted from the
OpenSlug howto. The steps below are not a howto yet, but if everything
ultimately works, perhaps this may form the basis of one...
- Install kernel-module-ftdi-sio ("ipkg install
kernel-module-ftdi-sio"). This works in Unslung, but would the other
instructions for making the modules load on boot, work as well?
- Install libusb ("ipkg install libusb") - this also worked in Unslung.
- Install the complete toolchain ("ipkg install optware-devel") so
that applications can be compiled directly on the slug.
- Download the source code for lcdproc 0.5.1 (the latest), and unpack
it into a 'source' directory (for me, this is /usr/src/) as root.
- Enter "./configure --prefix=/opt/ --enable-drivers=all". The
"--prefix=/opt/" part makes sure that binaries, config and other files
are installed in directories off /opt/, to fit in with Unslung
standards (as I understand them), whilst "--enable-drivers=all" is a
lazy way (suggested by the lcdproc INSTALL file!) of hopefully getting
the app to work 'out of the box'. (I would probably refine this later
so that only the Pertelian driver - HD44780, I think - would be enabled.)
- Enter "make", and then "make install". For me, this seemed to go
smoothly (taking just over ten minutes to compile - not bad for the
'slug'), and from there I edited /opt/etc/LCDd.conf as suggested by
the OpenSlug howto.
This is as far as I've got to date, though I'll almost certainly be
ordering a Pertelian very soon (after Christmas, probably). I'd really
like to get this working, not just for "geek value", but because it
would be very useful to view various system stats without having to
boot up a PC and log in via SSH to do so.
If possible, please could I have your views on the above, particularly:
- Would I need to adapt the OpenSlug instructions on loading the
ftdi-sio module at boot (create /etc/modutils/modules if it does not
exist; add a line containing only ftdi_sio to that file; after saving
the file run update-modules) for Unslung, and if so, how?
- Would I also have to load the usbserial module; alternatively, how
do I find out if it's already loaded?
- Can anyone see any potential problems ahead which I have missed
(quite likely - I'm not that experienced with Linux kernel modules and
Many thanks in advance, and I'll let you know how things progress at