Rockwell-automation 2727-MRSDK MobileView Terminals Software Developme Manual de usuario descargar pdf (Pagina 10)

Publication 2727-UM004B-EN-P - February 2004

1-4 Introduction to the MobileView SDK

• Hardware Initialization and Boot Loader, situated in the flash

• Windows CE Kernel with adaptations (Hardware Adaptation

Layer customized for the MobileView hardware, Built-in ISRs),

situated in the boot image stored in the operating system

partition of the Flash Storage

• Windows CE Default Registry, which is part of the boot image.

(A persistent registry, containing information relative to specific

configurations, is maintained in the file system and merged with

the default registry at boot.)

• Windows CE Modules and Device Drivers (File system

support,...), implemented as part of the boot image or as files

(dlls, exes, etc.) stored in the FAT16 partition of the Flash

Storage

• GUI Desktop Shell, implemented

• Control Panel and System Configuration/View Tools

Boot Sequence

The boot code in the Flash Storage gets control of the microprocessor

at power-on, initializes the hardware, performs power-on self-tests

(POST), and moves the compressed Windows CE operating system

image from the boot partition of the Flash Storage persistent storage

device into DRAM. Several seconds are required for the

decompression and copy operation. Finally, the boot loader jumps to

the start address of the Windows CE image and control passes to the

Windows CE operating system. Windows CE then loads drivers,

including the driver for the Flash Storage FAT16 file system (on the

“Flash Storage Space” partition), restores the registry, establishes the

video modes, and finally loads the start-up applications into memory

and runs them.

Load of Compressed Operating System

The boot code reads the compressed operating system image from the

Flash Storage operating system partition, decompresses it and loads it

into memory. (It loads the executable operating system code into

program memory and a default system registry into the RAMDISK

section of memory.) Control then passes to the operating system

image in memory.

“Cold Boot”

The operating system begins a “cold boot” by loading the driver for

the FAT file system on the Flash Storage.

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Rockwell-automation 2727-MRSDK MobileView Terminals Software Developme Manual de usuario Pagina 10