原本早就要发出来了，但是看到king_sundi网友已经发过一个帖子了，所以犹豫了没有发，相对而言，我这个总结更具有实用性，基本上照着这个步骤来就能成功，我给我几个朋友试过了，他们一开始对这个基本不懂都能搞定。
XIP实现总结.
step1:修改config.bib文件.内核子集XIPKERNEL的SIZE根据你自己编译出来的XIPKERNEL.BIN实际大小调整,
XIPKERNEL BASE=8C200000,XIPKERNEL SIZE = 0013F000 内存类型是RAMIMAGE
CHAIN BASE = XIPKERNEL BASE + XIPKERNEL SIZE; CHAIN SIZE = 00001000 内存类型是RESERVED
NK BASE = CHAIN BASE + CHAIN SIZE;NK SIZE根据你平台定制的实际NK.BIN的大小调整, 内存类型是 NANDIMAGE
RAM BASE = NK BASE + NK SIZE; RAM SIZE = 90000000 - RAM BASE, 内存类型是 RAM.
pdwXIPLoc 是一个指定地址的全局变量,用于InitRomChain(),它的地址必须等于CHAIN BASE.
XIPSCHAIN=8C33F000 也必须等于CHAIN BASE.
关于BIB文件中的MEMORY部分的定义可以从帮助文档中找到答案,搜索MEMORY Section
Name        Address        Size        Type
内存区域名字 起始地址     区域空间    内存类型

内存类型的取值分别有FIXUPVAR,NANDIMAGE,RAM,RAMIMAGE,RESERVED.
大家可以特别注意看一下NANDIMAGE的解释
Specifies that RAM should overlap these regions when building an run-time image that uses BINFS. 
The overlapping regions are stored in NAND but are fixed up to virtually appear as though they do not overlap. 

When the kernel accesses these regions, BINFS responds by intercepting the request. BINFS accesses NAND and returns the proper data to the kernel.

This enables a device with NAND to execute in place out of NAND, freeing up RAM for use by the system.

Romimage generates one binary (.bin) file for each NANDIMAGE entry.

NANDIMAGE sections must be page aligned.


MEMORY
    XIPKERNEL    8C200000  0013F000  RAMIMAGE
    CHAIN    8C33F000  00001000  RESERVED
    NK      8C340000  00D00000  NANDIMAGE
    RAM                8D040000  02FC0000  RAM
;    RAM                8C340000  03CC0000  RAM
    pdwXIPLoc    00000000    8C33F000    FIXUPVAR
;  FLASH  92000000  00100000  RESERVED

; Common RAM areas
    AUD_DMA            8c002000  00000800  RESERVED 
    SDIO_DMA            8c010000  00010000  RESERVED
    ARGS                8C020800  00000800  RESERVED
    DBGSER_DMA          8c022000  00002000  RESERVED
    SER_DMA            8c024000  00002000  RESERVED
    IR_DMA              8c026000  00002000  RESERVED
;    EDBG                8c030000  00020000  RESERVED
;    CAMERA                    8c050000  000A0000  RESERVED
    DISPLAY            8c100000  00100000  RESERVED    


;
; ROMFLAGS is a bitmask of options for the kernel
;  ROMFLAGS    0x0001      Disallow Paging
;  ROMFLAGS    0x0002      Not all KMode
;  ROMFLAGS    0x0010      Trust Module only
;
CONFIG
    AUTOSIZE=ON
;    ROM_AUTOSIZE=ON
    DLLADDR_AUTOSIZE=ON
    COMPRESSION=ON
    KERNELFIXUPS=ON
    XIPSCHAIN=8C33F000
    PROFILE=OFF

      ROMFLAGS=00


ROMSTART=8C200000  
ROMWIDTH=32
ROMSIZE=00D00000
【注】PB能生成XIP.BIN，这项一定要定义XIPSCHAIN=8C33F000，不然生成不了XIP.BIN的。

step2:
注册表的修改,platform.reg
; HIVE BOOT SECTION
; @CESYSGEN IF CE_MODULES_SDNPCID

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Support BINFS Section
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Add BinFS to partition table
[HKEY_LOCAL_MACHINE\System\StorageManager\PartitionTable]
    "21"="BINFS"

[HKEY_LOCAL_MACHINE\System\StorageManager\BINFS]
    "Folder"="BINFS"
    "FriendlyName"="Bin FileSystem"
    "Dll"="binfs.dll"
    "Paging"=dword:1
; MountFlags:
; 0x10 specifies that this file system is to be mounted as an external
;      ROM filesystem shadowing the \windows directory
; 0x1 specifies that the mountpoint \BINFS is to be hidden
;
    "MountFlags"=dword:10
    "BootPhase"=dword:0

[HKEY_LOCAL_MACHINE\System\StorageManager\AutoLoad\MSFlash]
    "DriverPath"="Drivers\\BuiltIn\\MSFlash"
    ; LoadFlags 0x01 == load synchronously
    "LoadFlags"=dword:1
    "Order"=dword:0
;    "MountFlags"=dword:10
    "BootPhase"=dword:0
    "Flags"=dword:1000

[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\MSFlash]
        "Prefix"="DSK"
        "Order"=dword:0
        "Dll"="smflash.dll"        
        "Profile"="MSFlash"
;        "MountFlags"=dword:10
        "FriendlyName"="MSFLASH Driver"
        "BootPhase"=dword:0
        "Flags"=dword:1000

; Bind BINFS to the block driver
[HKEY_LOCAL_MACHINE\System\StorageManager\Profiles\MSFlash]
    "DefaultFileSystem"="BINFS"
    "PartitionDriver"="mspart.dll"
    "AutoMount"=dword:1
    "AutoPart"=dword:1
    "Folder"="NandFlash"
    "Name"="Microsoft Flash Disk"
    "BootPhase"=dword:0
    "Flags"=dword:1000
    "MountAsHidden"=dword:1
    "MountAsRom"=dword:1
;    "MountFlags"=dword:00000004
;    "MountHidden"=dword:00000000

[HKEY_LOCAL_MACHINE\System\StorageManager\Profiles\MSFlash\FATFS]
    "FriendlyName"="FAT FileSystem"
    "Dll"="fatfsd.dll"
    "Flags"=dword:00280014
    "Paging"=dword:1
    "CacheSize"=dword:0
    "EnableCacheWarm"=dword:0
    "EnableCache"=dword:1
    "MountAsBootable"=dword:1
    "MountAsRom"=dword:1
;    "MountAsRoot"=dword:1
; @CESYSGEN ENDIF CE_MODULES_SDNPCID
; END HIVE BOOT SECTION
step3:
    系统选用的文件系统必须是RAM and ROM Filesystem,不能用ROM Only.
step4:
    要知道内核子集XIPKERNEL.BIN必须包含的modules和Files是那些,根据我的实践得出,下面这些文件是必需的:
    "nk.exe",
    "coredll.dll",
    "filesys.exe",
    "fatfsd.dll",
    "diskcache.dll",
    "fatutil.dll",
    "binfs.dll",
    "fsdmgr.dll",
    "mspart.dll",
    "smflash.dll",

    "boot.hv",
其它的可选.
step5:
    使用preromimage.bat和processbib.exe程序,把它们拷贝到你的PLATFORM/SMDK2440/FILES/目录下.

到此改动就算结束了,下面就是开始Build and Sysgen.
生成了XIP.BIN之后烧写到NAND FLASH上,需要你的BOOT支持分区,在烧写的时候自动创建BINFS分区和FAT分区,如果不幸的你用的不是EBOOT的话又不能创建BINFS和FAT分区的话就麻烦大了.
系统起来之后可以看到有个BINFS目录和一个NandFlash目录.
step6:
    最后一步,修改一下ce.bib的
    XIPKERNEL    8C200000  0013F000  RAMIMAGE
    CHAIN    8C33F000  00001000  RESERVED
    NK      8C340000  00D00000  NANDIMAGE
;    RAM                8D040000  02FC0000  RAM
    RAM                8C340000  03CC0000  RAM
使RAM的起始地址等于NK的起始地址,这里就是放大了RAM的空间,用命令行方式romimage ce.bib,生成XIPKERNEL.BIN的文件烧到NAND FLASH中去就可以了,有人有问题了发现XIPKERNEL.BIN太小烧不进去,在OEMVerifyMemory()判断里把它判断成了IMAGE_TYPE_RAMIMAGE,所以不写到FLASH了.把这段代码注释掉就好了.
/* comment for fix if the image too small and locate in range,then the image type will change to ram image and cause the image can not write to flash.
    // Is it a ram image?
    else if ((dwStartAddr >= ROM_RAMIMAGE_START) &&
        ((dwStartAddr + dwLength - 1) < (ROM_RAMIMAGE_START + ROM_RAMIMAGE_SIZE)))
    {
//      RETAILMSG(1, (TEXT("Downloading RAM image\r\n")));
        g_ImageType = IMAGE_TYPE_RAMIMAGE;
        return TRUE;
    }
*/
好了,完成,你的程序内存将会是61774K左右.
有疑问吗?我没有提到InitRomChain()函数,实践证明,你不写这个函数,不在OEMInit()里调用它也没有问题.让人感觉是多此一举.