P
ERFORMING
D
OWNLOADS
Use of SRAM and Flash ROM Memory
102
V
X
810 R
EFERENCE
G
UIDE
File Redirection in
Operating System
Downloads
When performing an operating system download, you must download the OS files
into Group 1 SRAM and not into flash ROM memory or into another file group.
OS files are downloaded onto Group 1 SRAM because it 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.
•
For full OS downloads, the redirection of OS files into Group 0 is performed
automatically, after the device restart, and as part of the download procedure.
•
For partial OS downloads, OS files are redirected from the SRAM of Group 1
into Group 0 on manual device restart by selecting the appropriate system
mode menu option.
A downloaded OS is processed and authenticated while stored in Group 1 SRAM.
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 moments, 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
device – in both file systems and in all file groups – transfer to the receiving device
in a single operation.
For this type of download, you must select Group 1 as the target group on the
sending and receiving devices. When you initiate the download on the receiving
device, all application files, as well as all special files required for file
authentication and device configuration settings on the sending device, download
to the receiving device.
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 device. This redirection process is transparent during the download.
Briefly, all files initially download into SRAM, and are redirected based on the
directory and subdirectory names of the sending device’s file system. Signature
files must always be authenticated in SRAM. If the target file that the signature file
authenticates is stored in flash ROM, the signature file is moved to flash ROM
only after the target file successfully authenticates.
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 device. If the *FA variable is present in the Group 1 CONFIG.SYS file of
the sending device, it must be set to 1 to retain all previously downloaded
signature files.
If a signature file is missing on the sending device, the target application file that it
authenticates is not authenticated on the receiving device and, if the target file is
an executable, it is not allowed to run on the receiving device.
Содержание DUET Vx810
Страница 1: ...VeriFone Part Number 24964 Revision B Vx810 Reference Guide ...
Страница 14: ...VX810 OVERVIEW Features and Benefits 14 VX810 REFERENCE GUIDE ...
Страница 90: ...VeriShield File Signing Tool 90 VX810 REFERENCE GUIDE ...
Страница 130: ...PERFORMING DOWNLOADS Back to Back Application Downloads 130 VX810 REFERENCE GUIDE ...
Страница 148: ...Information Messages 148 VX810 REFERENCE GUIDE ...
Страница 150: ...PORT PINOUTS COM Port 150 VX810 REFERENCE GUIDE ...
Страница 158: ...GLOSSARY 158 VX810 REFERENCE GUIDE ...