z/TPF Program Management - IBM

ELF objects
and libraries
from the HFS
Loader input file
Begin process
Primary process
Data flow
Image loader
offline component
(TPFLDR – TLDR)
Figure 5. Image load via image loader (Offline – z/OS)
End process
TLDR places the components that are specified in the loader input file on a storage
medium that can be loaded to the system by the ZTPLD command. For more
information about the ZTPLD command, see z/TPF Operations.
Note: If you are writing to a virtual reader, use the ELDRVRDR EXEC to convert
TLDR JOB output to a spool file that supports virtual reader input. A sample
ELDRVRDR EXEC is shipped as segment base/samples/uelv.rex.
The image loader is the main method for performing system loads for an existing
z/TPF system. The general file loader is only necessary at system generation time
or in an emergency load condition where no fallback image exists.
Use the image loader to load system components from a storage medium to any
defined and disabled z/TPF image. Because the image loader runs in 1052 state or
above, the subsystem must be initialized through a full load before the image loader
can be used. The image loader requires only a hard IPL to switch the image that is
now active.
If you are running more than one z/TPF image, make sure that the FCTBs and
RIATs for each system have compatible structures; that is, make sure that the
tables:
v Do not point to different addresses for the same record
v Do not point to the same address for different records.
Online image loader component (ZTPLD)
24 z/TPF Program Management
Storage
medium
Figure 6 on page 25 shows what happens when you enter the ZTPLD command to
start the online image loader component.