[Xen-users] Difficulties inserting external modules in dom0 & using a serial port

[Michael LeMay <lemaymd@xxxxxxxxxxx>]

Hello Xen users!

I have developed a kernel module for the X10 CM19A USB home automation 
controller.  I attempted to install it under Xen 3.0 dom0 running on 
Linux 2.6.16, but received the following error upon executing a modprobe:
x10_cm19a: Unknown symbol force_evtchn_callback

I then attempted to embed my module within the kernel itself, to see if 
my makefiles were missing something.  Unfortunately, that made no 
difference.
Then, I installed another external module (spca5xx) to see if this is a 
common problem among all external modules, but that module worked fine.  
Has anyone encountered this before?
As indicated in my subject line, I have one other problem.  I need to 
use the serial port on my computer to read data from a digital 
multimeter (I wish they'd switch to USB), but can't insert the 8250 module:
FATAL: Error inserting 8250 (...): Device or resource busy

-- Michael

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