User's Manual Part 3

PERFORMING DOWNLOADS
Omni 3600 Download Differences
68 OMNI 3600 REFERENCE MANUAL
File Redirection in Operating System Downloads
When performing an operating system download, you must download the OS files
into Group 1 RAM and not into flash memory or into another file group.
OS files download into Group 1 RAM because is not possible to download these
files directly into Group 0. OS files are redirected to Group 0 depending on if you
perform a full or partial download (see Table 13, page 60):
• For full OS downloads, the redirection of OS files into Group 0 is performed
automatically, after the terminal restart, as part of the download procedure.
• For partial OS downloads, OS files are redirected from the RAM of Group 1
into Group 0 on manual terminal restart by selecting the appropriate system
mode menu option.
A downloaded OS is processed and authenticated while stored in Group 1 RAM.
As the files are authenticated under the authority of the certificates and signature
files included in the OS download package, they move automatically into Group 0.
This process, which usually takes a few minutes, is completely transparent during
the download procedure.
File Redirection in Back-to-Back Application Downloads
In a back-to-back application download, all application files stored on the sending
terminal — in both file systems and in all file groups — transfer to the receiving
terminal in a single operation.
For this type of download, you must select Group 1 as the target group on the
sending and receiving terminal. When you initiate the download on the receiving
terminal, all application files, as well as all special files required for file
authentication and terminal configuration settings on the sending terminal,
download to the receiving terminal.
In this type of data transfer operation, some file redirection does occur
automatically as a result of the file authentication procedure that occurs on the
receiving terminal. This redirection process is transparent during the download.
Briefly, all files initially download into RAM, and are then redirected based on the
directory and subdirectory names of the sending terminal’s file system. Signature
files must always be authenticated in RAM. If the target file the signature file
authenticates is stored in flash, the signature file is moved to flash only after the
target file is successfully authenticated.
To successfully perform a back-to-back download, all signature files that are
required to authenticate application executables must reside in the memory of the
sending terminal. If the *FA variable is present in the Group 1 CONFIG.SYS file of
the sending terminal, it must be set to 1 to retain all previously downloaded
signature files.