nand flash无盘符问题

发布时间：2020-12-15 07:14:31 所属栏目：百科来源：网络整理

导读：作者：wogoyixikexie@gliet?2008-12-05 ??????????昨晚看以前优龙的老4.2BSP的flash驱动，发现和我现在不能发现这个盘符的驱动有些差别。下面这个函数是flash驱动加载的时候要执行的，作用是检测flash有没有坏块。我发现我在新的flash驱动中犯了严重的错误。

作者：wogoyixikexie@gliet?2008-12-05

??????????昨晚看以前优龙的老4.2BSP的flash驱动，发现和我现在不能发现这个盘符的驱动有些差别。下面这个函数是flash驱动加载的时候要执行的，作用是检测flash有没有坏块。我发现我在新的flash驱动中犯了严重的错误。等下会在代码中说明。

 
 DWORD?FMD_GetBlockStatus(BLOCK_ID?blockID)
{
????SECTOR_ADDR?Sector?=?(blockID?*?NAND_PAGE_CNT);
????SectorInfo?SI;
????DWORD?dwResult?=?0;
????
//我在新的flash驱动根本没有这句关键代码，这句的作用是把NK和bootloader
//占用的flash?的block标记为坏块，这样起到保护的作用
//其实这个并不完整，因为这样会检测超出最大block数目正确的做法是
//if(blockID<0x280||blockID>flash总block数目-1)//这样就不会越界了。
????if(blockID<0x280)//
????????return?BLOCK_STATUS_BAD;
 
  
????if?(IsBlockBad(blockID))
????????return?BLOCK_STATUS_BAD;
 
  
????if?(!FMD_ReadSector(Sector,?NULL,?&SI,?1))?
????????return?BLOCK_STATUS_UNKNOWN;
 
  
????if?(!(SI.bOEMReserved?&?OEM_BLOCK_READONLY))??
????????dwResult?|=?BLOCK_STATUS_READONLY;
 
  
????if?(!(SI.bOEMReserved?&?OEM_BLOCK_RESERVED))??
????????dwResult?|=?BLOCK_STATUS_RESERVED;
 
  
????return(dwResult);
}

我还发现一些注册表的问题。

这是4.2可发现盘符的BSP的flash注册表部分

 
 [HKEY_LOCAL_MACHINE/System/StorageManager/Profiles/FlashDrv]
??"DriverPath"="Drivers//BuiltIn//FlashDrv"
??"DefaultFileSystem"="FATFS"//这在失败哪里是没有的，居然是binfs不可思议。
??"PartitionDriver"="mspart.dll"
??"AutoMount"=dword:1
??"AutoPart"=dword:1
??"AutoFormat"=dword:1//这个也没有，这个会对没有格式化过的flash自动格式化。
??"Folder"="nand?flash"
??"Name"="Microsoft?Flash?Disk"
??"BootPhase"=dword:0
??"Flags"=dword:1000//这个有什么用？
??"Ioctl"=dword:4//这个有什么用？

少了那几个东西，对于使用优龙的BIOS来说，是不能发现盘符的。

在这里重新回到优龙ADS bootloader的话题，我仔细看过，里面的确没有binfs以及FAT分区功能。

那经过上面注册表之后为什么就实现分区了呢？

——————查看CSDN老帖，有：

有几个问题求教，望高手们赐教： ??
? 1 ? 用CreatePartition函数会自动生成MBR和分区表吗？ ??
? 2 ? 我用DeviceIoControl函数时，好象只能对某个分区进行读写。我想用CreateFile，第一个参数应该指定一个物理设备名，对于Nand ? Flash应该指定为什么字符串啊？

================================

是可以生成mbr，以及mbr里的partition ? table的。 ??
? ??
? 参见C:/WINCE420/PRIVATE/WINCEOS/COREOS/STORAGE/DOSPART/part.cpp代码

============================================================================================

 
 C:/WINCE500/PRIVATE/WINCEOS/COREOS/STORAGE/DOSPART/helper.cpp(747):BOOL?WriteMBR(DriverState?*state,?SECTORNUM?snSectorNum,?SECTORNUM?snNumSectors,?BYTE?fileSysType,?BOOL?bCreateMBR)?
//重新创建MBR，这个不知道在哪里被调用了，但是可以解释优龙的问题。
/*****************************************************************************?
*??WriteMBR?-?adds?a?partition?entry?to?the?master?boot?record.?The?partition?
*??table?is?traversed?to?find?the?placement?for?this?partition.??Entries?within?
*??the?MBR?are?sorted?by?the?start?sector.?
*?
*??Input:??state?-?structure?for?this?store?
*??????????snSectorNum?-?start?sector?number?for?this?partition?
*??????????snNumSectors?-?number?of?sectors?in?this?partition?
*??????????fileSysType?-?partition?type?
*??????????bCreateMBR?-?TRUE?to?generate?a?new?MBR,?FALSE?to?add?to?the?
*??????????????????????existing?MBR?
*?
*??Output:?none?
*?
*??Return:?TRUE?if?successfully?written,?FALSE?for?failures,?ERROR_DISK_FULL?
*??????????will?be?set?if?no?room?in?the?MBR?
*?

*****************************************************************************/?
BOOL?WriteMBR(DriverState?*state,?BOOL?bCreateMBR)?
{?
 
  
????PBYTE??????buffer?=?NULL;?
????PPARTENTRY??tmpbuffer,?tmpbuffer1;?
????BOOL????????bResult;?
????int????????i,?partIndex,?partNum?=?-1;?
 
  
????//?don't?create?the?MBR,?it?already?exists?so?use?it? 这个要特别注意，检测是否已经分区，没有就重新写入MBR
????if?(!bCreateMBR)?
????{?
????????bResult?=?ReadSectors?(state,?0,?1,?&buffer);?
????????if?(!bResult)?
????????????return?FALSE;?
 
  
????????for?(i?=?0,?partIndex?=?0,?tmpbuffer?=?(PPARTENTRY)(buffer?+?PARTTABLE_OFFSET);?i?<?4;?i++,?tmpbuffer++)?
????????{?
????????????if?(tmpbuffer->Part_TotalSectors?==?0)?
????????????{?
????????????????partNum?=?i;?
????????????????break;?
????????????}?
 
  
????????????//?find?the?index?of?the?partition?located?just?before?this?one?
????????????if?(snSectorNum?>?tmpbuffer->Part_StartSector)?
????????????????partIndex?=?i?+?1;?
????????}?
 
  
????????if?(partNum?==?-1)?
????????{?
????????????//?we?return?this?error?code?so?the?caller?can?tell?that?there's?no?room?in?the?MBR?
????????????LocalFree(buffer);?
????????????SetLastError(ERROR_DISK_FULL);?
????????????return?FALSE;?
????????}?
 
  
????????//?these?indexes?would?be?equal?if?we?are?adding?to?the?end?of?the?table?
????????if?(partIndex?!=?partNum)?
????????{?
????????????//?this?partition?needs?to?be?added?in?the?order?that?it?appears?on?the?disk?-?so?this?may?involve?
????????????//??shifting?some?of?the?existing?partition?entries?to?open?up?the?partition?entry?where?this?belongs?
????????????tmpbuffer?=?(PPARTENTRY)(buffer?+?PARTTABLE_OFFSET?+?(partNum?*?sizeof(PARTENTRY)));?
????????????tmpbuffer1?=?(PPARTENTRY)(buffer?+?PARTTABLE_OFFSET?+?((partNum?-1)?*?sizeof(PARTENTRY)));?
 
  
????????????for?(;?partNum?>?partIndex;?partNum--)?
????????????{?
????????????????memcpy(tmpbuffer,?tmpbuffer1,?sizeof(PARTENTRY));?
????????????????tmpbuffer--;?
????????????????tmpbuffer1--;?
????????????}?
????????}?
????}?
????else?
????{?
????????buffer?=?(PBYTE)LocalAlloc(LMEM_ZEROINIT,?state->diskInfo.di_bytes_per_sect);?
????????if?(!buffer)?
????????????return?FALSE;?
 
  
????????//?add?header?and?trailer?info?to?the?MBR?
????????*(WORD?*)(buffer?+?BOOT_SIGNATURE)?=?BOOTSECTRAILSIGH;?
????????buffer[0]?=?0xE9;?
????????buffer[1]?=?0xfd;?
????????buffer[2]?=?0xff;?
????????partNum?=?0;?
????}?
 
  
????tmpbuffer?=?(PPARTENTRY)(buffer?+?PARTTABLE_OFFSET?+?partNum?*?(int)sizeof(PARTENTRY));?
 
  
????//?create?the?partition?entry?for?the?extended?partition?
????bResult?=?ConvertLBAtoCHS?(state,?snSectorNum,?&tmpbuffer->Part_FirstTrack,?&tmpbuffer->Part_FirstHead,?&tmpbuffer->Part_FirstSector);?
 
  
????tmpbuffer->Part_FileSystem?=?fileSysType;?
????tmpbuffer->Part_StartSector?=?(DWORD)snSectorNum;?
????tmpbuffer->Part_TotalSectors?=?(DWORD)snNumSectors;?
 
  
????bResult?=?ConvertLBAtoCHS?(state,?tmpbuffer->Part_StartSector?+?tmpbuffer->Part_TotalSectors?-1,?&tmpbuffer->Part_LastTrack,?&tmpbuffer->Part_LastHead,?&tmpbuffer->Part_LastSector);?
 
  
????bResult?=?WriteSectors(state,?buffer);?
????LocalFree(buffer);?
 
  
????return?bResult;?
 
  
}?

如果eboot不格式化FAT分区，就要在flash驱动中把NK所占block标记为坏块。才行。? 但是如何让系统自动格式化位binfs我就不知道怎么搞了。这个不行的。因为当时已经存在NK了，不能再格式化了。? 哈哈，终于弄明白优龙为何不支持binfs了。? 哈哈，现在如果在ADS增加binfs格式化那么就好办了。

（编辑：李大同）

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