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

 return NF_WritePage(nRowAddr, nColAddr, pvBuffer, 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。