yaffscfg.cpp

文件系统在DSP上的实现

/*
 * YAFFS: Yet another FFS. A NAND-flash specific file system.
 * yaffscfg.c  The configuration for the "direct" use of yaffs.
 *
 * This file is intended to be modified to your requirements.
 * There is no need to redistribute this file.
 */

#ifdef _WIN32	// 如果是win32系统
	#include "stdafx.h"
#endif //_WIN32


#include "yaffscfg.h"
#include "yaffsfs.h"
#include <errno.h>
#include "sysarch.h"


unsigned yaffs_traceMask = 0xFFFFFFFF;


TSem  g_semYAFFS;
//int errno = 0;

void yaffsfs_SetError(int err)
{
	//Do whatever to set error
	errno = err;
}

void yaffsfs_Lock(void)
{
	WaitSemaphore(g_semYAFFS);
}

void yaffsfs_Unlock(void)
{

	SignalSemaphore(g_semYAFFS);

}

__u32 yaffsfs_CurrentTime(void)
{
	return 0;
}

void yaffsfs_LocalInitialisation(void)
{
	// Define locking semaphore.

	g_semYAFFS = NewSemaphore(1);
}

// Configuration for:
// /ram  2MB ramdisk
// /boot 2MB boot disk (flash)
// /flash 14MB flash disk (flash)
// NB Though /boot and /flash occupy the same physical device they
// are still disticnt "yaffs_Devices. You may think of these as "partitions"
// using non-overlapping areas in the same device.
// 

#include "yaffs_ramdisk.h"
#include "yaffs_flashif.h"

static yaffs_Device ramDev;
static yaffs_Device bootDev;
static yaffs_Device flashDev;

static yaffsfs_DeviceConfiguration yaffsfs_config[] = {

	//{ "/ram", &ramDev},
	//{ "/boot", &bootDev},
	//{ "/flash", &flashDev},

	{ "/root", &bootDev},
	{(const char *)0,(struct yaffs_DeviceStruct *)0}
};

int yaffs_StartUpFormate(void)
{
	// /boot

	bootDev.nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;

	bootDev.nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;

	bootDev.nReservedBlocks = 5;

	bootDev.startBlock = 1; // Can't use block 0

	bootDev.endBlock = 510; // Last block in 2MB.	

	bootDev.useNANDECC = 0; // use YAFFS's ECC

	bootDev.nShortOpCaches = 0; //10 Use caches

	bootDev.genericDevice = (void *) 1;	// Used to identify the device in fstat.

	bootDev.writeChunkToNAND = yflash_WriteChunkToNAND;

	bootDev.readChunkFromNAND = yflash_ReadChunkFromNAND;

	bootDev.eraseBlockInNAND = yflash_EraseBlockInNAND;

	bootDev.initialiseNAND = yflash_InitialiseNAND;

	bootDev.writeSpare = yflash_WriteSpare;
	
	bootDev.repairWriteChunkError = yflash_RepairWriteChunkError;

	yaffs_initialise(yaffsfs_config);
	
	return 0;
}

int yaffs_StartUp(void)
{
	// Stuff to configure YAFFS
	// Stuff to initialise anything special (eg lock semaphore).
	yaffsfs_LocalInitialisation();
	
	// Set up devices
/*
	// /ram
	ramDev.nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
	ramDev.nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
	ramDev.nReservedBlocks = 2; // Set this smaller for RAM
	ramDev.startBlock = 1; // Can't use block 0
	ramDev.endBlock = 127; // Last block in 2MB.	
	ramDev.useNANDECC = 0;    //1;
	ramDev.nShortOpCaches = 0;	// Disable caching on this device.
	ramDev.genericDevice = (void *) 0;	// Used to identify the device in fstat.
	ramDev.writeChunkToNAND = yramdisk_WriteChunkToNAND;
	ramDev.readChunkFromNAND = yramdisk_ReadChunkFromNAND;
	ramDev.eraseBlockInNAND = yramdisk_EraseBlockInNAND;
	ramDev.initialiseNAND = yramdisk_InitialiseNAND;

	// /boot
	bootDev.nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
	bootDev.nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
	bootDev.nReservedBlocks = 5;
	bootDev.startBlock = 1; // Can't use block 0
	bootDev.endBlock = 127; // Last block in 2MB.	
	bootDev.useNANDECC = 0; // use YAFFS's ECC
	bootDev.nShortOpCaches = 10; // Use caches
	bootDev.genericDevice = (void *) 1;	// Used to identify the device in fstat.
	bootDev.writeChunkToNAND = yflash_WriteChunkToNAND;
	bootDev.readChunkFromNAND = yflash_ReadChunkFromNAND;
	bootDev.eraseBlockInNAND = yflash_EraseBlockInNAND;
	bootDev.initialiseNAND = yflash_InitialiseNAND;



	// /flash
	flashDev.nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
	flashDev.nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
	flashDev.nReservedBlocks = 5;
	flashDev.startBlock = 128; // First block after 2MB
	flashDev.endBlock = 1023; // Last block in 16MB
	flashDev.useNANDECC = 0; // use YAFFS's ECC
	flashDev.nShortOpCaches = 10; // Use caches
	flashDev.genericDevice = (void *) 2;	// Used to identify the device in fstat.
	flashDev.writeChunkToNAND = yflash_WriteChunkToNAND;
	flashDev.readChunkFromNAND = yflash_ReadChunkFromNAND;
	flashDev.eraseBlockInNAND = yflash_EraseBlockInNAND;
	flashDev.initialiseNAND = yflash_InitialiseNAND;*/


	// /boot

	bootDev.nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;

	bootDev.nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;

	bootDev.nReservedBlocks = 5;

	bootDev.startBlock = 1; // Can't use block 0

	bootDev.endBlock = 510; // Last block in 2MB.	

	bootDev.useNANDECC = 0; // use YAFFS's ECC

	bootDev.nShortOpCaches = 0; //10 Use caches

	bootDev.genericDevice = (void *) 1;	// Used to identify the device in fstat.

	bootDev.writeChunkToNAND = yflash_WriteChunkToNAND;

	bootDev.readChunkFromNAND = yflash_ReadChunkFromNAND;

	bootDev.eraseBlockInNAND = yflash_EraseBlockInNAND;

	bootDev.initialiseNAND = yflash_InitialiseNAND;

	bootDev.writeSpare = yflash_WriteSpare;
	
	bootDev.repairWriteChunkError = yflash_RepairWriteChunkError;

	yaffs_initialise(yaffsfs_config);
	
	return 0;
}