VeriFone DUET Vx810, Справочное руководство

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P
ERFORMING
D
OWNLOADS
Use of SRAM and Flash ROM Memory
V X 810 R
EFERENCE
G
UIDE
97
The Main
Application is
Always Stored in
GID1
The main application stored in GID1 is the controlling application for the device.
Any function call that invokes a related program or a secondary application stored
in GIDs 2–14 must be initiated by the GID1 application.
An application stored in a file group other than GID1 is limited in that it can only
access executables and files stored in its own file group and in GID15.
Physical and
Logical Access to
File Groups
The V
x
810 operating system controls physical access to GIDs 1–15 using
password-protected system mode functions.
To download data into a specific file group, first enter system mode and choose
the target group by making the appropriate menu selections, then enter the
correct password for that file group.
Each file group has its own CONFIG.SYS file. The CONFIG.SYS settings of the
selected target group are used as the system parameters for the download
operation.
The system of file groups also imposes some logical restrictions on which files can
download into specific file groups:
•
If GID1 is selected as the target group in system mode, you can download files
into GID1 and redirect files into any of the other file groups, as required, in the
same download operation.
•
If another file group is selected as the target file group, you can download files
only into that group and redirect files only to GID15. For example, if you select
GID5 as the target group for the download, files can only download into GID5
and be redirected to GID15.
Use of SRAM
and Flash ROM
Memory
The V
x
810 application memory partition has two separate file systems:
•
SRAM (battery-backed volatile memory, also called SRAM), partition
designator I:
•
Flash ROM (non-volatile memory), partition designator F:
Having two different file systems has the following important implications for data
transfer procedures:
•
Depending on the requirements of a specific application, some files must
download into SRAM and others into flash ROM.
•
There are also rules that restrict which types of files you can download and
store in a file system (SRAM or flash ROM).
With application files, the application designer or programmer usually decides
which file types to download into which file system. Other file types, such as
operating system files, digital certificates, and signature files, must download into
SRAM.