yaffs移植

yaffs2移植只要实现下面的接口就可以

#define YAFFS_OK?1
#define YAFFS_FAIL? 0

//初始化

INT32U HAL_NandInit(void* p)
{
?NF_InitCfg();//底层的nand初始化驱动
?return 0;
}

//读flash

void HAL_NandReadId(INT32U *pulNandID1,INT32U *pulNandID2)
{
?*pulNandID1 = NF_ReadID();
?*pulNandID2 = *pulNandID1;
}

//写flash

INT32U HAL_NandPageRead(INT32U ulBlock,INT32U ulPage,INT32U ulOffset,INT32U ulLength,void *pvBuffer)
{
?int nRowAddr = (ulBlock << 6) + ulPage;
?int nColAddr = ulOffset;

?return NF_ReadPage(nRowAddr,nColAddr,pvBuffer,ulLength);//nandflash驱动
}

//擦除块

INT32U HAL_NandBlockErase(INT32U ulBlock)
{
?if(NF_EraseBlock(ulBlock) == 0)
?{
??return YAFFS_OK;
?}

?return YAFFS_FAIL;
}

//写flash

INT32U HAL_NandPageWrite(INT32U ulBlock,const void *pvBuffer)
{
?int nRowAddr = (ulBlock << 6) + ulPage;
?int nColAddr = ulOffset;

?return NF_WritePage(nRowAddr,ulLength);//nandflash驱动
}

nandflash的种类很多，yaffs2要适用不同的flash需要一些配置。配置是在yaffs2的入口函数yaffs_startup（int nStartBlock）。nStartBlock表示的是yaffs2管理的开始块。