WinCE5.0 SMDK2410 BSP在GEC2410开发板上的移植(3)-基于Nor Flash的Eboot
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 #define SST39VF1601_BLOCK_SIZE 64*1024 #define GET_ADDR(addr) (volatile UINT16 *)(SST39VF1601_FLASH_START | (addr<<1)) #define SST_ID 0x00BF #define SST_39VF3201 0x234B
[2]SST39VF1601_CheckID
DWORD SST39VF1601_CheckID( void ) { volatile WORD *ip; WORD SST_id1, SST_id2; /* Issue the Software Product ID code to 39VF160 */ ip = GET_ADDR(0x5555); *ip = 0x00AA; ip = GET_ADDR(0x2AAA); *ip = 0x0055; ip = GET_ADDR(0x5555); *ip = 0x0090; /* Read the product ID from 39VF160 */ ip = GET_ADDR(0x0000); SST_id1 = *ip & 0x00FF; ip = GET_ADDR(0x0001); SST_id2 = *ip; /* Issue the Soffware Product ID Exit code thus returning the 39VF160 */ /* to the read operating mode */ ip = GET_ADDR(0x5555); *ip = 0x00AA; ip = GET_ADDR(0x2AAA); *ip = 0x0055; ip = GET_ADDR(0x5555); *ip = 0x00F0; // RETAILMSG(1, (TEXT("SST_id1=0x%x SST_id2=0x%x/r/n"), SST_id1, SST_id2)); /* Check ID */ if ((SST_id1 == SST_ID) && (SST_id2 ==SST_39VF3201)) return (TRUE); else return (FALSE); }
[3]SST39VF1601_SectorErase
UINT8 SST39VF1601_SectorErase(UINT32 Index) { volatile UINT16 *ip; UINT16 temp1,temp2; ip = GET_ADDR(0x5555); *ip = 0x00aa; ip = GET_ADDR(0x2aaa); *ip = 0x0055; ip = GET_ADDR(0x5555); *ip = 0x0080; ip = GET_ADDR(0x5555); *ip = 0x00aa; ip = GET_ADDR(0x2aaa); *ip = 0x0055; ip = (UINT16*)GetSectorAddress(Index); *ip = 0x0030; while (1) { temp1 = *ip; temp2 = *ip; if (temp1 == temp2) { if (temp1 != 0xffff) { return FALSE; } else { return TRUE; } } } return TRUE; }
[4]SST39VF1601_WriteWord
UINT8 SST39VF1601_WriteWord(UINT32 Addr, UINT16 Data) { volatile UINT16 *ip; UINT16 temp1,temp2; ip = GET_ADDR(0x5555); *ip = 0x00aa; ip = GET_ADDR(0x2aaa); *ip = 0x0055; ip = GET_ADDR(0x5555); *ip = 0x00a0; ip = ((volatile UINT16 *)(Addr)); *ip = Data; while (1) { temp1 = *ip; temp2 = *ip; if (temp1 == temp2) { if (temp1 != Data) { return FALSE; } else { return TRUE; } } } return TRUE; }
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) { PBYTE pReadPtr = (PBYTE)(SST39VF1601_FLASH_START + dwOffset); memcpy(pData, pReadPtr, dwLength); return(TRUE); }
[6]SST39VF1601_EraseFlash
BOOL SST39VF1601_EraseFlash(UINT32 dwOffset, UINT32 dwLength) { UINT8 NumSects = 0; UINT32 dwEraseLength = 0; UINT16 StartSector = GetSectorNumber(dwOffset); while(dwEraseLength < dwLength) { dwEraseLength += SST39VF1601_SECTOR_SIZE; ++NumSects; } if (!NumSects) { NumSects = 1; dwEraseLength = SST39VF1601_SECTOR_SIZE; } 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)); while(NumSects--) { if (!SST39VF1601_SectorErase(StartSector + NumSects)) { RETAILMSG(1, (TEXT("ERROR: SST39VF1601_EraseFlash: EraseSector failed on sector 0x%x!/r/n"), NumSects)); return(FALSE); } } return(TRUE); }
[7]SST39VF1601_WriteFlash
BOOL SST39VF1601_WriteFlash(UINT32 dwOffset, PBYTE pData, UINT32 dwLength) { UINT32 dwByteOffset; RETAILMSG(1, (TEXT("SST39VF1601_WriteFlash: Writing 0x%x bytes to flash (offset 0x%x bytes).../r/n"), dwLength, dwOffset)); for (dwByteOffset = 0 ; dwByteOffset < dwLength ; dwByteOffset += sizeof(USHORT)) { if(!SST39VF1601_WriteWord ((SST39VF1601_FLASH_START + dwOffset + dwByteOffset), *(PUSHORT)(pData + dwByteOffset))) { RETAILMSG(1, (TEXT("Write to flash failed at offset 0x%x/r/n"),dwOffset + dwByteOffset)); } } return(TRUE); }
[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) { UINT32 ret; ret = dwOffset/(SST39VF1601_SECTOR_SIZE); return ret; } static UINT32 GetSectorAddress(UINT8 SectorNumber) { UINT32 dwSectorAddr = 0; dwSectorAddr = SectorNumber * SST39VF1601_SECTOR_SIZE; return(SST39VF1601_FLASH_START + dwSectorAddr); }
三、烧写完成运行