本文介绍在A9上添加HIVE注册表，使其自动保存路径为MMCMemory
1、HIVE注册表的加载步骤
a) NK.exe执行，启动Filesys.dll。Filesys.dll首先加载Boot Hive，此时Boot Hive位于NK.bin解压之后的文件中。然后，filesys.dll在启动device.dll后处于等待状态，等待device.dll将包含System Hive的文件系统的存储设备的驱动程序加载完毕，而这个文件系统的存储设备的驱动程序在Boot Hive中；
b) Device.dll在上述驱动开始工作之后进入等待状态，然后filesys.dll被唤醒，加载并且安装System Hive，然后filesys.dll再次处于等待状态；
c) NK.exe按照System Hive的信息开始执行初始化工作，包括加载驱动和启动一些应用程序。其中加载驱动一般由device.dll执行，而启动应用程序由filesys.dll执行，这时device.dll和filesys.dll都被唤醒
d) 因为Boot Hive和System Hive可能都有重复的地方，所以可能重复加载了驱动或重复启动了应用程序。为此，windows CE允许在描述驱动程序的注册表信息中加入防止重复的标志
2、实践操作
a) 添加Hive注册表所需要的组件如下：
b) 添加全局变量
SET PRJ_ENABLE_REGFLUSH_THREAD=1 ;该全局变量是自动保存注册表所需
set PRJ_ENABLE_FSREGHIVE=1 ;这个属于PRJ Environment Variables ，在MSDN上描述为：Controls whether the hive-based registry is enabled by default
相关msdn条词在：Windows Embedded Compact 7 > Reference > Environment Variables >
（ms-help://MS.VSCC.v90/MS.VSIPCC.v90/MS.WindowsCompact.v70.en/WECP_Ref_EnvVar/html/d497612e-796d-4d1b-a836-729c43ca6170.htm）
c)添加注册表
从HIVE注册表加载步骤中可以得知，HIVE注册表的加载首先需要由device.dll 初始化设备驱动，然后由filesys.dll加载文件系统并读取出System.hv，再交由device.dll按照注册表加载驱动
因此我们在注册表中需要的信息有：设备驱动相关注册表、文件系统相关注册表、BootVars相关注册表。 这里将所有的注册表和需要注意事项通过注释写出来
; HIVE BOOT SECTION
; BootVars
;
; We want start both storage and device manager. Flags value is combination of
; 0x0001 Start storage manager in boot phases 0 and 1 to load the boot
; file system.
; 0x0002 Start device manager in boot phase 1 to load the boot file system.
;
[HKEY_LOCAL_MACHINE\Init\BootVars]
"Flags"=dword:3
; "SystemHive"="\\Documents and Settings\\system.hv" 这里需要删除，添加后USB同步无法使用，且一旦添加同步后，系统死机 ，分析原因：CE7默认路径不是这儿
; "ProfileDir"="\\Documents and Settings"
; "DefaultUser"="default"
; "RegistryFlags"=dword:0 ;这里设置为0，设置为1的话系统起不来，不知为何，且网贴有介绍称设置为1会影响系统效率，因为每次读写均在flash中
; RegistryFlags: 0:Lazy Flush 1:auto save when modify 2:;Disable background registry flushing to improve performance.
; END HIVE BOOT SECTION
; HIVE BOOT SECTION
; SD Drivers 这里添加SD卡加载所需的驱动注册表
[HKEY_LOCAL_MACHINE\Drivers\Builtin\SDBusDriver]
"Order"=dword:15
"Dll"="SDBus.dll"
"Prefix"="SDC"
"ThreadPriority"=dword:64 ; default thread priority for dispatch thread
"RequestListDepth"=dword:30 ; pre-allocated requests
"IClass"=multi_sz:"{20FA98A8-B298-4b32-8D72-C716AEE2FA84}=%b","{6F40791D-300E-44E4-BC38-E0E63CA8375C}=%b"
"BootPhase"=dword:1 ; change to 1
"Flags"=dword:1000 ; 设置Flags信息，该注册表信息在系统阶段不会被加载
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\USDHC4]
"Order"=dword:20
"Dll"="usdhc.dll"
"Prefix"="SHC"
"Index"=dword:4
;"DisableDMA"=dword:1 ; Use this ;reg setting to disable both internal and external DMA
"MaximumClockFrequency"=dword:3197500 ; 52 MHz max clock speed
;"WakeupSource"=dword:1 ; this will enable system wakeup when card is inserted or removed during suspend state
; "CardDetectOpt"=dword:0
"Flags"=dword:1000
; MMC Drivers
; MMC Storage Class Driver 这一部分的驱动，在后续加载SD卡时还会被用到，因此不应该添加Flags = 1000
[HKEY_LOCAL_MACHINE\System\StorageManager\Profiles\SDMemory]
"Name"="SD Memory Card"
"Folder"="SDMemory"
; "Flags"=dword:1000
;"PartitionDriver"="" ; removable storage cannot have partitions
[HKEY_LOCAL_MACHINE\System\StorageManager\Profiles\SDMemory\FATFS]
"FormatFatVersion"=dword:10 ; standard sd cards require fat12 or fat16, and cannot use fat32
; "Flags"=dword:1000
[HKEY_LOCAL_MACHINE\System\StorageManager\Profiles\SDHCMemory]
"Name"="SD Memory Card"
"Folder"="SDHCMemory"
;"PartitionDriver"="" ; removable storage cannot have partitions
; "Flags"=dword:1000
[HKEY_LOCAL_MACHINE\System\StorageManager\Profiles\SDHCMemory\FATFS]
"FormatFatVersion"=dword:20 ; high capacity SD cards need to use fat32 and cannot use fat16
; "Flags"=dword:1000
[HKEY_LOCAL_MACHINE\System\StorageManager\Profiles\MMC]
"Name"="MMC Card"
"Folder"="MMCMemory"
"FormatTfat"=dword:1
"MountAsBootable"=dword:1
"MountPermanent"=dword:0
; "Flags"=dword:1000
[HKEY_LOCAL_MACHINE\System\StorageManager\Profiles\MMC\FATFS]
"FormatTfat"=dword:1
"AutoMount"=dword:1
"AutoPart"=dword:1
"AutoFormat"=dword:1
"DisableAutoFormat"=dword:0
"FormatTfat"=dword:1
"MountAsBootable"=dword:1
"MountPermanent"=dword:0
; "Flags"=dword:1000
[HKEY_LOCAL_MACHINE\System\StorageManager\Profiles\MMC\EXFAT]
"FormatTfat"=dword:1
"AutoMount"=dword:1
"AutoPart"=dword:1
"AutoFormat"=dword:1
"DisableAutoFormat"=dword:0
; "Flags"=dword:1000
; SD Memory Storage class driver
[HKEY_LOCAL_MACHINE\Drivers\SDCARD\ClientDrivers\Class\SDMemory_Class]
"Dll"="SDMemory.dll"
"Prefix"="DSK"
"BlockTransferSize"=dword:40 ; send no more than 64 blocks of data per bus transfer
;"SingleBlockWrites"=dword:1 ; alternatively force the driver to use single block access
;"IdleTimeout"=dword:7D0 ; 2000 milliseconds
;"IdlePowerState"=dword:2 ; 0 == D0, 1 == D1, etc.
;"DisablePowerManagement"="" ; if value present, then disable (remove value to enable)
; "Flags"=dword:1000
"Profile"="SDMemory"
"IClass"=multi_sz:"{A4E7EDDA-E575-4252-9D6B-4195D48BB865}",
"{8DD679CE-8AB4-43c8-A14A-EA4963FAA715}"
; SDHC Memory Storage class driver
[HKEY_LOCAL_MACHINE\Drivers\SDCARD\ClientDrivers\Class\SDMemory_Class\High_Capacity]
"Dll"="SDMemory.dll"
"Prefix"="DSK"
"BlockTransferSize"=dword:40 ; send no more than 64 blocks of data per bus transfer
;"SingleBlockWrites"=dword:1 ; alternatively force the driver to use single block access
;"IdleTimeout"=dword:7D0 ; 2000 milliseconds
;"IdlePowerState"=dword:2 ; 0 == D0, 1 == D1, etc.
;"DisablePowerManagement"="" ; if value present, then disable (remove value to enable)
; "Flags"=dword:1000
"Profile"="SDHCMemory"
"IClass"=multi_sz:"{A4E7EDDA-E575-4252-9D6B-4195D48BB865}",
"{8DD679CE-8AB4-43c8-A14A-EA4963FAA715}"
; MMC Storage Class Driver
[HKEY_LOCAL_MACHINE\Drivers\SDCARD\ClientDrivers\Class\MMC_Class]
"Dll"="SDMemory.dll"
"Prefix"="DSK"
"BlockTransferSize"=dword:40 ; send no more than 64 blocks of data per bus transfer
;"SingleBlockWrites"=dword:1 ; alternatively force the driver to use single block access
;"IdleTimeout"=dword:7D0 ; milliseconds
;"IdlePowerState"=dword:2 ; 0 == D0, 1 == D1, etc.
;"DisablePowerManagement"="" ; if value present, then disable (remove value to enable)
; "Flags"=dword:1000
"Profile"="MMC"
"IClass"=multi_sz:"{A4E7EDDA-E575-4252-9D6B-4195D48BB865}",
"{8DD679CE-8AB4-43c8-A14A-EA4963FAA715}"
[HKEY_LOCAL_MACHINE\Drivers\SDCARD\ClientDrivers\Class\MMC_Class\High_Capacity]
"Dll"="SDMemory.dll"
"Prefix"="DSK"
"BlockTransferSize"=dword:40 ; send no more than 64 blocks of data per bus transfer
;"SingleBlockWrites"=dword:1 ; alternatively force the driver to use single block access
;"IdleTimeout"=dword:7D0 ; milliseconds
;"IdlePowerState"=dword:2 ; 0 == D0, 1 == D1, etc.
;"DisablePowerManagement"="" ; if value present, then disable (remove value to enable)
; "Flags"=dword:1000
"Profile"="MMC"
"IClass"=multi_sz:"{A4E7EDDA-E575-4252-9D6B-4195D48BB865}",
"{8DD679CE-8AB4-43c8-A14A-EA4963FAA715}"
; END HIVE BOOT SECTION
;*********************************************************************************************************
;
; 注册表自动保存注意事项:
;
; 下面每间隔1秒(FlushPeriod的值)就会检查注册表是否有改变, 有则保存注册表,
;
; 使能时, 必须设置环境变量: SET PRJ_ENABLE_REGFLUSH_THREAD=1
;
; 同时, 还要"RegistryFlags"=dword:1改成dword:0，不用每次注册表修改就自动去flush注册表。
;
;*********************************************************************************************************
IF PRJ_ENABLE_REGFLUSH_THREAD
[HKEY_LOCAL_MACHINE\System\ObjectStore\RegFlush]
; To monitor the flushing from an external process add "ActivityName" registry value.
; The activity name is a global named event that filesystem will signal on Registry Activity.
; "ActivityName"=""
; Create an thread in filesys to perform flushing
"SpawnThread"=dword:1
; Make the thread IDLE priority
"FlushPriority256"=dword:FF
; ActivityThreshold specifies the # of reg activity before we force a flush
"ActivityThreshold"=dword:100
; Timeout period for a flush (flush occurs if there have been some changes during this period)
"FlushPeriod"=dword:3E8
ENDIF
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