www.pudn.com > yaffs2.zip > yaffscfg2k.c

/* 
 * 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. 
 */ 
 
#include "yaffscfg.h" 
#include "yaffsfs.h" 
#include "yaffs_fileem2k.h" 
 
#include  
 
unsigned yaffs_traceMask = 0xFFFFFFFF; 
 
 
void yaffsfs_SetError(int err) 
{ 
	//Do whatever to set error 
	errno = err; 
} 
 
void yaffsfs_Lock(void) 
{ 
} 
 
void yaffsfs_Unlock(void) 
{ 
} 
 
__u32 yaffsfs_CurrentTime(void) 
{ 
	return 0; 
} 
 
void yaffsfs_LocalInitialisation(void) 
{ 
	// Define locking semaphore. 
} 
 
// 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}, 
	{(void *)0,(void *)0} 
}; 
 
 
int yaffs_StartUp(void) 
{ 
	// Stuff to configure YAFFS 
	// Stuff to initialise anything special (eg lock semaphore). 
	yaffsfs_LocalInitialisation(); 
	 
	// Set up devices 
	// /ram 
	memset(&ramDev,0,sizeof(ramDev)); 
	ramDev.nBytesPerChunk = 512; 
	ramDev.nChunksPerBlock = 32; 
	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 = 1; 
	ramDev.nShortOpCaches = 0;	// Disable caching on this device. 
	ramDev.genericDevice = (void *) 0;	// Used to identify the device in fstat. 
	ramDev.writeChunkWithTagsToNAND = yramdisk_WriteChunkWithTagsToNAND; 
	ramDev.readChunkWithTagsFromNAND = yramdisk_ReadChunkWithTagsFromNAND; 
	ramDev.eraseBlockInNAND = yramdisk_EraseBlockInNAND; 
	ramDev.initialiseNAND = yramdisk_InitialiseNAND; 
 
	// /boot 
	memset(&bootDev,0,sizeof(bootDev)); 
	bootDev.nBytesPerChunk = 512; 
	bootDev.nChunksPerBlock = 32; 
	bootDev.nReservedBlocks = 5; 
	bootDev.startBlock = 1; // Can't use block 0 
	bootDev.endBlock = 63; // Last block 
	//bootDev.useNANDECC = 0; // use YAFFS's ECC 
	bootDev.nShortOpCaches = 10; // Use caches 
	bootDev.genericDevice = (void *) 1;	// Used to identify the device in fstat. 
	bootDev.writeChunkWithTagsToNAND = yflash_WriteChunkWithTagsToNAND; 
	bootDev.readChunkWithTagsFromNAND = yflash_ReadChunkWithTagsFromNAND; 
	bootDev.eraseBlockInNAND = yflash_EraseBlockInNAND; 
	bootDev.initialiseNAND = yflash_InitialiseNAND; 
	bootDev.markNANDBlockBad = yflash_MarkNANDBlockBad; 
	bootDev.queryNANDBlock = yflash_QueryNANDBlock; 
 
 
 
	// /flash 
	// Set this puppy up to use 
	// the file emulation space as 
	// 2kpage/64chunk per block/128MB device 
	memset(&flashDev,0,sizeof(flashDev)); 
 
	flashDev.nBytesPerChunk = 2048; 
	flashDev.nChunksPerBlock = 64; 
	flashDev.nReservedBlocks = 5; 
	flashDev.startBlock = 64; // First block after /boot 
	//flashDev.endBlock = 127; // Last block in 16MB 
	flashDev.endBlock = (512 * 1024 * 1024)/(flashDev.nBytesPerChunk * flashDev.nChunksPerBlock) - 1; // Last block in 512MB 
	flashDev.isYaffs2 = 1; 
	flashDev.nShortOpCaches = 10; // Use caches 
	flashDev.genericDevice = (void *) 2;	// Used to identify the device in fstat. 
	flashDev.writeChunkWithTagsToNAND = yflash_WriteChunkWithTagsToNAND; 
	flashDev.readChunkWithTagsFromNAND = yflash_ReadChunkWithTagsFromNAND; 
	flashDev.eraseBlockInNAND = yflash_EraseBlockInNAND; 
	flashDev.initialiseNAND = yflash_InitialiseNAND; 
	flashDev.markNANDBlockBad = yflash_MarkNANDBlockBad; 
	flashDev.queryNANDBlock = yflash_QueryNANDBlock; 
 
	yaffs_initialise(yaffsfs_config); 
	 
	return 0; 
}