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谢谢版主回复：）

的确不是FAT的问题，我查看程序之后发现它会根据大小进行匹配。

下面是我的map函数的相关代码，请版主指教：

typedef struct {
unsigned short vendorID;
unsigned short chipID;
unsigned short pageSize ; /* all....................*/
unsigned short pageMask ; /* ...these...............*/
unsigned short pageAreaSize ; /* .......variables.......*/
unsigned short tailSize ; /* .............interleave*/
unsigned short noOfBlocks ; /* total erasable blocks in flash device*/
FLBuffer *buffer; /* buffer for map through buffer */
} Vars;

static Vars mtdVars[DRIVES];

#define thisVars ((Vars *) vol.mtdVars)
#define thisBuffer (thisVars->buffer->data)

static void FAR0 * NandMTDMap ( FLFlash vol,CardAddress Address,int length )
{
//unsigned int BlockNo=Address>>18;
NandMTDRead(&vol,Address,thisBuffer,length, 0);
vol.socket->remapped = TRUE;
return (void FAR0 *)thisBuffer;
}

对了 在注册函数NandMTDIdentify中，有对window操作的语句，我也只是照搬过来，只对flSetWindowBusWidth改为了8，其他并没有动。不知道配置是否正确。

flSetWindowBusWidth(vol.socket,8);/* use 8-bits */
flSetWindowSpeed(vol.socket,120); /* 120 nsec. */
flSetWindowSize(vol.socket, 2); /* 4 KBytes unit*/

是不是flSetWindowSize()的参数给的不对啊，因为我同时在sysTffs.c中发现了

LOCAL void rfaSetWindow
(
FLSocket vol /* pointer identifying drive */
)
{
/* Physical base as a 4K page */

vol.window.baseAddress = FLASH_BASE_ADRS >> 12;

flSetWindowSize (&vol, FLASH_SIZE >> 12);
}

两者显然配置的不一样。不知道window是一个什么概念？是不是要将第一个的参数改为FLASH_SIZE >> 12