About object store

Hi,All:
The object store in Windows CE provides persistent storage for application
and their
related data even when the main power supply is lost,provided there is a
backup power
supply.One or more memory storage chips,which typically are nonvolatile
RAM chips,compose
the physical object store.
The operating system uses the object store to perform the following
tasks:
1) Manage the stack and memory heap
2) Compress and expand files as necessary
3) Seamlessly integrate ROM-based applications and RAM-based data.(from
PB help:ms-help://MS.WindowsCE.500/wcedata5/html/wce50conobjectstore.htm)

But I have the following puzzles:
Does object store only reside in SDRAM,or RAM section of config.bib?
If object store resides in SDRAM,how to preserve data and files when
power is off abruptly?


Another question:

Wince offers three types of file system:ROM-based file system,RAM-based
file system and a
FAT file system.
I don't know about RAM-base file system? Does it only reside on RAM?
And ROM-based file system only resides flash.

Are these understandings right?

Thanks in advance.


--
Best wishes
Wang Yeqing
***********************************************************
Intelligent Grouping Research and Development Institute
Amoi Electronics Co., Ltd

Tel: 86-592-6516777-6515
***********************************************************

Zhongwei
Tue Jan 11 09:12:29 CST 2005

Object store resides in RAM, so it is not persistent, the help says
"...provides persistent storage .... provided there is a backup power
supply". So when all power supply are gone, files and data only in RAM are
lost.

Wince offers three types of file system, but only two internal file systems
are available: RAM and ROM file system and ROM-only file system. RAM-based
file system provides file storage in the object store, which is in RAM, but
it is not internal file system option alone. ROM-only file system does not
allow applications to place files in the object store. A wince platform will
typically need to access files in ROM, RAM and externel storage devices, the
three types of file system meet the needs.

--
Zhongwei Wang
Applied Data Systems
www.applieddata.net
Application - Ready embedded systems
Microsoft Windows Embedded Partner
Gold Level Member

sloh
Tue Jan 11 10:20:19 CST 2005

Also, when you use the "ROM-only" internal file system, you can mount a
persistent file system like FATFS as the root.

Sue
sloh@microsoft.com (remove "online" from reply-to address)
http://blogs.msdn.com/sloh/
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