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I would love to hear from somebody at Samsung about what this program, mfp does.  I replaced it with a small program I wrote that opens the device (after searching through /dev/usblp[0-7] and /dev/usb/lp[0-7]) reading stdin and writing it to the opened device.  (Well, there is a select and a big long timeout just in case too) and it works but my system does everything as root.

So I now have printed something.  Next up is seeing how the scanner works.

Thanks for the reply, I tried a few things and now do things as root but still no printing.  The CUPS error_log shows an MFP executable problem. 

I am using Unified Linux Driver 3.00.90, (3.00.37 did not work either) on an embedded system running Linux 2.6.20 (Ubuntu 8.04 is 2.6.24 so it's close) A quick synopsis of the CUPS error log is when printing a .pdf file, filter/pdftops starts, filter/rastertosamsungspl starts and then backend/mfp starts.  Then gs and pstops start, then the error log shows,

D [16/Jan/2013:11:11:25 +0000] [Job 3] Unable to create temp file!: Operation not permitted
D [16/Jan/2013:11:11:25 +0000] PID 1349 (/usr/lib/cups/backend/mfp) stopped with status 4.

What does mfp do?  It looks like it talks directly to the device, taking standard input.  Anybody know more?

Thanks,  Dan Stone

Thanks for the reply.  I have actually fixed all the install errors (except for something about "echo_successful") and seem to be at a point where authentication is my problem on a system that is a single user system.  The problems I fixed where all cross compiler problems in the CUPS package.

So what I got is this,

lp -d scx3405 some.pdf  -  Does something but nothing prints, i.e. lpq works and shows my print job, lprm removes it, but as I said, nothing prints.

My guess is "cupsdAuthorize: No authentication data provided" may be part of the problem.  That is the output I get along with a bunch more, from the error_log.

Any help appreciated!

Thank you for your reply.   I have grabbed the UnifiedLinuxDriver-3.00.37 and am working with that but my embedded Linux 2.6.20 is having installation issues.  Here's a cut and paste from the window,  Note, there is no "group" on this system and when the install finishes, smfpd is running as seen in the ps ax.

Thanks!

****  Please enter model to install and press Enter: scx3405
INFO: Installing MFP port and SANE backend libraries ...
ERROR: rc0.d directory not found
cat: can't open '/etc/modprobe.conf': No such file or directory
INFO: Installing GUI lpr ...
INFO: Fixing file ownership and permissions ...
INFO: Registering SANE backend ...
INFO: Registering CUPS printer ...
INFO: can't restart CUPS - script not found
lpadmin: Unable to connect to server: Connection refused
lpadmin: Unable to connect to server: Connection refused
lpadmin: Unable to connect to server: Connection refused
INFO: Creating menu entries ...
INFO: Finishing installation ...
****  Text mode install finished

Hi, 
I have been given the task of getting command line printing and scanning working on a USB connected multifunction SCX-3405 Samsung printer connected to a Unbuntu 8.04 like embedded system (PC like, i386).

I have had many possibly false starts with CUPS, LPRng and foomatic.  I have configured and compiled ghostscript 8.70, splix 1.0.1-1, LPRng 3.8.28 and foomatic 4.0.12 for the embedded system.  I figure some combination of the above plus a binary or 2 from a here and I should be able to make this all work.

I have also tried installing Unified Linux Driver 4.00.39 but there is no QT package nor X server running.

Thanks in advance,

D Stone