From following you can see needed boot parameters, startup script location.
Running on a Motorola MVME2401 power PC cpu card.

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QXRMI

CNS57> telnet qxrmi
Trying... Connected to QXRMI.FNAL.GOV, a MOTOROLA:-MVME712M running VXWORKS.

VxWorks login: vxworks_boot
Password:

QXRMI>bootChange

'.' = clear field;  '-' = go to previous field;  ^D = quit

boot device          : ei0
processor number     : 0
host name            : fecode-bd
file name            : vxworks_boot/kernel/mv177/vxWorks
inet on ethernet (e) : 131.225.124.148:ffff0000
inet on backplane (b):
host inet (h)        : 131.225.121.145
gateway inet (g)     : 131.225.124.200
user (u)             : vxworks_boot
ftp password (pw) (blank = use rsh):
flags (f)            : 0x1
target name (tn)     : QXRMI_0x0ab5
startup script (s)   : vxworks_boot/fe/qxrmi/login_qxrmi
other (o)            :

startup script is /fecode-bd/vxworks_boot/fe/qxrmi/login_qxrmi

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QXRTEV

Note that qxrtev is no longer operational, so used for development.
(Here we see that it's running code for qxrmi).

CNS57> telnet qxrtev
Trying... Connected to QXRTEV.FNAL.GOV.


VxWorks login: vxworks_boot
Password:

QXRMI>bootChange

'.' = clear field;  '-' = go to previous field;  ^D = quit

boot device          : dc0
processor number     : 0
host name            : fecode-bd
file name            : vxworks_boot/kernel/mv2400/vxWorks
inet on ethernet (e) : 131.225.124.150:ffffff00
inet on backplane (b):
host inet (h)        : 131.225.121.145
gateway inet (g)     : 131.225.124.200
user (u)             : vxworks_boot
ftp password (pw) (blank = use rsh):
flags (f)            : 0x9
target name (tn)     : qxrtev_0xa1a
startup script (s)   : vxworks_boot/fe/qxrmi/login_qxrmi
other (o)            :

QXRMI>version
VxWorks (for Motorola MVME2401-1 - MPC 750) version 5.4.
Kernel: WIND version 2.5.
Made on Apr 17 2001, 12:34:57.
Boot line:
dc(0,0)fecode-bd:vxworks_boot/kernel/mv2400/vxWorks e=131.225.124.150:ffffff00 h
=131.225.121.145 g=131.225.124.200 u=vxworks_boot f=0x9 tn=qxrtev_0xa1a s=vxwork
s_boot/fe/qxrmi/login_qxrmi

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QXRTEST was used for development for qxrtev, and is likely turned off.

QXRTEST>
unique in the following

file name            : vxworks_boot/fe/qxrtest/vxWorks
inet on ethernet (e) : 131.225.123.230:ffff0000
target name (tn)     : qxrtest_0x9d7
startup script (s)   : vxworks_boot/fe/qxrtest/login_qxrtev