Motorola MC21XX SERIES Especificações descarregar pdf (Página 47)

Application Development 4 - 3

Windows CE Flash Storage

In addition to the RAM-based storage standard on the MC21XX, the MC21XX is also equipped with a

non-volatile Flash-based storage area which can store data (partitions) that can not be corrupted by a cold

boot. This Flash area is divided into two categories: Flash File System (FFS) Partitions and Non-FFS

Partitions.

FFS Partitions

The MC21XX includes two FFS partitions. These partitions appear to the MC21XX as a hard drive that the OS

file system can write files to and read files from. Data is retained even if power is removed.

The two FFS partitions appear as two separate folders in the Windows CE file system and are as follows:

•

Platform: The Platform FFS partition contains Motorola-supplied programs and Dynamic Link Libraries

(DLLs). This FFS is configured to include DLLs that control system operation. Since these drivers are

required for basic MC21XX operation, only experienced users should modify the content of this partition.

•

Application: The Application FFS partition is used to store application programs needed to operate the

MC21XX.

Working with FFS Partitions

Because the FFS partitions appear as folders under the Windows CE file system, they can be written to and

read like any other folder. For example, an application program can write data to a file located in the

Application folder just as it would to the Windows folder. However, the file in the Application folder is in

non-volatile storage and is not lost on a cold boot (e.g., when power is removed for a long period of time).

Standard tools such as ActiveSync can be used to copy files to and from the FFS partitions. They appear as

the “Application” and “Platform” folders to the ActiveSync explorer. This is useful when installing applications

on the MC21XX. Applications stored in the Application folder are retained even when the MC21XX is cold

booted, just as the Sample Applications program is retained in memory.

There are two device drivers included in the Windows CE image to assist developers in configuring the

MC21XX following a cold boot: RegMerge and CopyFiles.

RegMerge.dll

RegMerge.dll is a built-in driver that allows registry edits to be made to the Windows CE registry. Regmerge.dll

runs very early in the boot process and looks for registry files (.reg files) in certain Flash File System folders

during a cold boot. It then merges the registry changes into the system registry located in RAM.

Since the registry is re-created on every cold boot from the default ROM image, the RegMerge driver is

necessary to make registry modifications persistent over cold boots.

RegMerge is configured to look in the root of two specific folders for .reg files in the following order:

\Platform

\Application

Regmerge continues to look for .reg files in these folders until all folders are checked. This allows folders later

in the list to override folders earlier in the list. This way, it is possible to override Registry changes made by the

Platforms partitions folders. Take care when using Regmerge to make registry changes.

NOTE Regmerge only merges the .reg files on cold boots. The merge process is skipped during a warm boot.

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Motorola MC21XX SERIES Especificações Página 47