学步园

之前的两篇文章介绍了基于Nand Flash的Eboot，通过使用Nboot来引导Eboot的方式。其实GEC2410开发板配有1片2M Bytes的Nor Flash(SST39VF1601)，程序可以直接运行在Nor Flash上，就不需要Nboot来引导了。当然最终Eboot还是运行在RAM中，Eboot会自我复制到RAM中运行。

原来使用自带的sjf410烧写非常慢，后来找到了H-JTAG和对应2410的烧写配置，然后烧写就非常方便了。因此以后Eboot就放到Nor Flash，OS Image放到Nand Flash中。
SMDK2410 BSP用的Nor Flash是AMD的am29lv800，与GEC2410不同，因此需要增加Nor Flash的驱动。

一、开发环境
编译器: Platform Builder 5.0
目标板: GEC2410 S3C2410A,NAND Flash:64M K9F1208,NOR Flash:2M SST39VF1601 SDRAM 64M,CS8900

二、开始移植
(1)去除不相关代码
注释掉AM29LV800_Init((UINT32)AMD_FLASH_START)
注释掉原来通过Nand Flash读写Eboot配置的函数

去除AM29LV800.c

(2)增加SST39VF1601驱动
之前使用板子自带的ADS下SST39VF1601的驱动，但是始终无法正常读写。后来使用SMARTARM2200带的SST39VF1601驱动进行修改，最终获得成功
其实主要几个函数如下，具体可参考之后我发的整个BSP的源代码
[1]几个宏的定义
#define SST39VF1601_SECTOR_SIZE 4*1024<br /> #define SST39VF1601_BLOCK_SIZE 64*1024<br /> #define GET_ADDR(addr) (volatile UINT16 *)(SST39VF1601_FLASH_START | (addr<<1))<br /> #define SST_ID 0x00BF<br /> #define SST_39VF3201 0x234B
[2]SST39VF1601_CheckID
DWORD SST39VF1601_CheckID( void )<br /> {<br /> volatile WORD *ip;<br /> WORD SST_id1, SST_id2;</p> <p> /* Issue the Software Product ID code to 39VF160 */<br /> ip = GET_ADDR(0x5555);<br /> *ip = 0x00AA;<br /> ip = GET_ADDR(0x2AAA);<br /> *ip = 0x0055;<br /> ip = GET_ADDR(0x5555);<br /> *ip = 0x0090;</p> <p> /* Read the product ID from 39VF160 */<br /> ip = GET_ADDR(0x0000);<br /> SST_id1 = *ip & 0x00FF;<br /> ip = GET_ADDR(0x0001);<br /> SST_id2 = *ip; </p> <p> /* Issue the Soffware Product ID Exit code thus returning the 39VF160 */<br /> /* to the read operating mode */<br /> ip = GET_ADDR(0x5555);<br /> *ip = 0x00AA;<br /> ip = GET_ADDR(0x2AAA);<br /> *ip = 0x0055;<br /> ip = GET_ADDR(0x5555);<br /> *ip = 0x00F0; </p> <p>// RETAILMSG(1, (TEXT("SST_id1=0x%x SST_id2=0x%x/r/n"), SST_id1, SST_id2));</p> <p> /* Check ID */<br /> if ((SST_id1 == SST_ID) && (SST_id2 ==SST_39VF3201))<br /> return (TRUE);<br /> else<br /> return (FALSE);<br /> }
[3]SST39VF1601_SectorErase
UINT8 SST39VF1601_SectorErase(UINT32 Index)<br /> {<br /> volatile UINT16 *ip;<br /> UINT16 temp1,temp2;</p> <p> ip = GET_ADDR(0x5555);<br /> *ip = 0x00aa;<br /> ip = GET_ADDR(0x2aaa);<br /> *ip = 0x0055;<br /> ip = GET_ADDR(0x5555);<br /> *ip = 0x0080;<br /> ip = GET_ADDR(0x5555);<br /> *ip = 0x00aa;<br /> ip = GET_ADDR(0x2aaa);<br /> *ip = 0x0055;<br /> ip = (UINT16*)GetSectorAddress(Index);</p> <p> *ip = 0x0030;</p> <p> while (1)<br /> {<br /> temp1 = *ip;<br /> temp2 = *ip;<br /> if (temp1 == temp2)<br /> {<br /> if (temp1 != 0xffff)<br /> {<br /> return FALSE;<br /> }<br /> else<br /> {<br /> return TRUE;<br /> }<br /> }<br /> }<br /> return TRUE;<br /> }
[4]SST39VF1601_WriteWord
UINT8 SST39VF1601_WriteWord(UINT32 Addr, UINT16 Data)<br /> {<br /> volatile UINT16 *ip;<br /> UINT16 temp1,temp2;</p> <p> ip = GET_ADDR(0x5555);<br /> *ip = 0x00aa;<br /> ip = GET_ADDR(0x2aaa);<br /> *ip = 0x0055;<br /> ip = GET_ADDR(0x5555);<br /> *ip = 0x00a0;</p> <p> ip = ((volatile UINT16 *)(Addr));<br /> *ip = Data;<br /> while (1)<br /> {<br /> temp1 = *ip;<br /> temp2 = *ip;<br /> if (temp1 == temp2)<br /> {<br /> if (temp1 != Data)<br /> {<br /> return FALSE;<br /> }<br /> else<br /> {<br /> return TRUE;<br /> }<br /> }<br /> }<br /> return TRUE;<br /> }
以下3个函数是供Read(Write)BootConfig来调用的，与原来的结构一致
[5]SST39VF1601_ReadFlash
BOOL SST39VF1601_ReadFlash(UINT32 dwOffset, PBYTE pData, UINT32 dwLength)<br /> {<br /> PBYTE pReadPtr = (PBYTE)(SST39VF1601_FLASH_START + dwOffset);</p> <p> memcpy(pData, pReadPtr, dwLength);</p> <p> return(TRUE);<br /> }
[6]SST39VF1601_EraseFlash
BOOL SST39VF1601_EraseFlash(UINT32 dwOffset, UINT32 dwLength)<br /> {<br /> UINT8 NumSects = 0;<br /> UINT32 dwEraseLength = 0;<br /> UINT16 StartSector = GetSectorNumber(dwOffset);</p> <p> while(dwEraseLength < dwLength)<br /> {<br /> dwEraseLength += SST39VF1601_SECTOR_SIZE;<br /> ++NumSects;<br /> }</p> <p> if (!NumSects)<br /> {<br /> NumSects = 1;<br /> dwEraseLength = SST39VF1601_SECTOR_SIZE;<br /> }</p> <p> RETAILMSG(1, (TEXT("SST39VF1601_EraseFlash: Requested 0x%x bytes, Erasing 0x%x sectors (0x%x bytes) (offset 0x%x bytes).../r/n"), dwLength, NumSects, dwEraseLength, dwOffset)); </p> <p> while(NumSects--)<br /> {</p> <p> if (!SST39VF1601_SectorErase(StartSector + NumSects))<br /> {<br /> RETAILMSG(1, (TEXT("ERROR: SST39VF1601_EraseFlash: EraseSector failed on sector 0x%x!/r/n"), NumSects));<br /> return(FALSE);<br /> }<br /> }</p> <p> return(TRUE);<br /> }
[7]SST39VF1601_WriteFlash
BOOL SST39VF1601_WriteFlash(UINT32 dwOffset, PBYTE pData, UINT32 dwLength)<br /> {<br /> UINT32 dwByteOffset;</p> <p> RETAILMSG(1, (TEXT("SST39VF1601_WriteFlash: Writing 0x%x bytes to flash (offset 0x%x bytes).../r/n"), dwLength, dwOffset));</p> <p> for (dwByteOffset = 0 ; dwByteOffset < dwLength ; dwByteOffset += sizeof(USHORT))<br /> {<br /> if(!SST39VF1601_WriteWord ((SST39VF1601_FLASH_START + dwOffset + dwByteOffset), *(PUSHORT)(pData + dwByteOffset)))<br /> {<br /> RETAILMSG(1, (TEXT("Write to flash failed at offset 0x%x/r/n"),dwOffset + dwByteOffset));</p> <p> }</p> <p> }</p> <p> return(TRUE);<br /> }
[8]只需用以上3个函数代替原来main.c中WriteBootConfig和ReadBootConfig中对应的Flash函数即可   
SST39VF1601_ReadFlash(EBOOT_CONFIG_OFFSET, (PBYTE)pBootCfg, sizeof(BOOT_CFG))和
[9]还有两个用到的函数GetSectorNumberGetSectorAddress也是为了兼容原来的结构实现的，针对Sector进行了计算
static UINT32 GetSectorNumber(UINT32 dwOffset)<br /> {<br /> UINT32 ret;<br /> ret = dwOffset/(SST39VF1601_SECTOR_SIZE);<br /> return ret;<br /> }</p> <p>static UINT32 GetSectorAddress(UINT8 SectorNumber)<br /> {<br /> UINT32 dwSectorAddr = 0;</p> <p> dwSectorAddr = SectorNumber * SST39VF1601_SECTOR_SIZE;</p> <p> return(SST39VF1601_FLASH_START + dwSectorAddr);<br /> }
三、烧写完成运行