I buily a new uSD using the image that Robert sent me the link for.
I ran uname -r and it reports 4.19.15-ti-rt-r8.
I am guessing that the rt stands for rt-preempt???

I ran machinekit:
machinekit@beaglebone:~$ machinekit
MACHINEKIT - 0.1
Machine configuration directory is 
'/home/machinekit/machinekit/configs/ARM.BeagleBone.Xylotex'
Machine configuration file is 'Xylotex.ini'
Starting Machinekit...
rtapi_msgd command:  /usr/libexec/linuxcnc/rtapi_msgd --instance=0 
--rtmsglevel=1 --usrmsglevel=1 --halsize=524288
rtapi_app command:  /usr/libexec/linuxcnc/rtapi_app_rt-preempt --instance=0
rtapi: no service UUID (-R <uuid> or environment MKUUID) present
rtapi_app startup failed; aborting
halcmd: no service UUID (-R <uuid> or MACHINEKIT_INI [GLOBAL]MKUUID) present
io started
halcmd: no service UUID (-R <uuid> or MACHINEKIT_INI [GLOBAL]MKUUID) present
halcmd loadusr io started
halcmd: no service UUID (-R <uuid> or MACHINEKIT_INI [GLOBAL]MKUUID) present
halcmd: no service UUID (-R <uuid> or MACHINEKIT_INI [GLOBAL]MKUUID) present
Shutting down and cleaning up Machinekit...
halcmd: no service UUID (-R <uuid> or MACHINEKIT_INI [GLOBAL]MKUUID) present
halcmd: no service UUID (-R <uuid> or MACHINEKIT_INI [GLOBAL]MKUUID) present
halcmd: no service UUID (-R <uuid> or MACHINEKIT_INI [GLOBAL]MKUUID) present
halcmd: no service UUID (-R <uuid> or MACHINEKIT_INI [GLOBAL]MKUUID) present
halcmd: no service UUID (-R <uuid> or MACHINEKIT_INI [GLOBAL]MKUUID) present
halcmd: no service UUID (-R <uuid> or MACHINEKIT_INI [GLOBAL]MKUUID) present
halcmd: no service UUID (-R <uuid> or MACHINEKIT_INI [GLOBAL]MKUUID) present
halcmd: no service UUID (-R <uuid> or MACHINEKIT_INI [GLOBAL]MKUUID) present
halcmd: no service UUID (-R <uuid> or MACHINEKIT_INI [GLOBAL]MKUUID) present
halcmd: no service UUID (-R <uuid> or MACHINEKIT_INI [GLOBAL]MKUUID) present
halcmd: no service UUID (-R <uuid> or MACHINEKIT_INI [GLOBAL]MKUUID) present
halcmd: no service UUID (-R <uuid> or MACHINEKIT_INI [GLOBAL]MKUUID) present
Cleanup done
Machinekit terminated with an error.  For simple cases more information
can be found in the following files:
    /home/machinekit/linuxcnc_debug.txt
    /home/machinekit/linuxcnc_print.txt

For other cases get more meaningfull information by restarting after
    export DEBUG=5

and look at the output of:
    /var/log/linuxcnc.log
    dmesg

When looking for errors, specifically look for libraries that fail to load
by looking for lines with 'insmod failed' as per example below.

insmod failed, returned -1:
do_load_cmd: dlopen: nonexistant-component.so: cannot open shared object 
file:
No such file or directory

For getting help, please have a look here: 
www.machinekit.io/docs/getting-help/

-- 
website: http://www.machinekit.io blog: http://blog.machinekit.io github: 
https://github.com/machinekit
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