[Yaffs] 2.6.12.1 - no data after umount ?

Manav Gautam bandwidthcrunch at gmail.com
Fri Aug 19 14:31:33 BST 2005


Dear All,
             I have a pxa board with samsung nand 64MB k91208UOM
loaded. I have been trying to implement yaffs on a 2.6.12.1 kernel but
 all well and good untill I umount the nand partition , nothing is
retained

[root at Sarva /mnt]#mount -t yaffs /dev/mtdblock3 /mnt/nand/
yaffs: dev is 32505859 name is "(unavailable)"
yaffs: Attempting MTD mount on 31.3, "(unavailable)"
block 1 is bad
block 5 is bad
block 8 is bad
block 17 is bad
block 21 is bad
block 24 is bad
block 33 is bad
and so on 
[root at Sarva /mnt]#df
Filesystem           1k-blocks      Used Available Use% Mounted on
/dev/mtdblock2           31488     24892      6596  79% /
/dev/mtdblock3           65520     12384     53136  19% /mnt/nand

[root at Sarva /mnt]#cat /proc/yaffs
YAFFS built:Aug 19 2005 13:02:27
$Id: yaffs_fs.c,v 1.35 2004/10/20 20:12:43 charles Exp $
$Id: yaffs_guts.c,v 1.37 2004/10/20 20:12:43 charles Exp $

Device yaffs
startBlock......... 1
endBlock........... 4095
chunkGroupBits..... 1
chunkGroupSize..... 2
nErasedBlocks...... 3327
nTnodesCreated..... 0
nFreeTnodes........ 0
nObjectsCreated.... 100
nFreeObjects....... 97
nFreeChunks........ 106464
nPageWrites........ 0
nPageReads......... 0
nBlockErasures..... 0
nGCCopies.......... 0
garbageCollections. 0
passiveGCs......... 0
nRetriedWrites..... 0
nRetireBlocks...... 0
eccFixed........... 0
eccUnfixed......... 0
tagsEccFixed....... 0
tagsEccUnfixed..... 3327
cacheHits.......... 0
nDeletedFiles...... 0
nUnlinkedFiles..... 0
nBackgroudDeletions 0
useNANDECC......... 1

Now if i try to copy a file to the partion it does it and i can even view it 

[root at Sarva /mnt]#cp /root/exp/nanddump.c nand/
Writing data without ECC to NAND-FLASH is not recommended
Writing data without ECC to NAND-FLASH is not recommended
Writing data without ECC to NAND-FLASH is not recommended
Writing data without ECC to NAND-FLASH is not recommended
Writing data without ECC to NAND-FLASH is not recommended
Writing data without ECC to NAND-FLASH is not recommended
Writing data without ECC to NAND-FLASH is not recommended
Writing data without ECC to NAND-FLASH is not recommended
Writing data without ECC to NAND-FLASH is not recommended
Writing data without ECC to NAND-FLASH is not recommended
Writing data without ECC to NAND-FLASH is not recommended
Writing data without ECC to NAND-FLASH is not recommended
Writing data without ECC to NAND-FLASH is not recommended
Writing data without ECC to NAND-FLASH is not recommended
Writing data without ECC to NAND-FLASH is not recommended
Writing data without ECC to NAND-FLASH is not recommended
Reading data from NAND FLASH without ECC is not recommended
**>>ecc error fix performed on chunk 64:0
**>>ecc error fix performed on chunk 64:1
**>>Block 2 marked for retirement
Writing data without ECC to NAND-FLASH is not recommended

 [root at Sarva nand]#ls -la
drw-rw-rw-    1 root     root          512 Jan  1 00:11 .
drwxr-xr-x    5 root     root            0 Jan  1 00:04 ..
drw-rw-rw-    1 root     root          512 Jan  1 00:11 lost+found
-rw-r--r--    1 root     root         7372 Jan  1 00:12 nanddump.c

and 
[root at Sarva nand]#cat /proc/yaffs
YAFFS built:Aug 19 2005 13:02:27
$Id: yaffs_fs.c,v 1.35 2004/10/20 20:12:43 charles Exp $
$Id: yaffs_guts.c,v 1.37 2004/10/20 20:12:43 charles Exp $

Device yaffs
startBlock......... 1
endBlock........... 4095
chunkGroupBits..... 1
chunkGroupSize..... 2
nErasedBlocks...... 3326
nTnodesCreated..... 100
nFreeTnodes........ 99
nObjectsCreated.... 100
nFreeObjects....... 96
nFreeChunks........ 106448
nPageWrites........ 18
nPageReads......... 1
nBlockErasures..... 0
nGCCopies.......... 0
garbageCollections. 0
passiveGCs......... 0
nRetriedWrites..... 0
nRetireBlocks...... 0
eccFixed........... 0
eccUnfixed......... 0
tagsEccFixed....... 0
tagsEccUnfixed..... 3327
cacheHits.......... 0
nDeletedFiles...... 0
nUnlinkedFiles..... 0
nBackgroudDeletions 0
useNANDECC......... 1

Now after umounting and mounting again
[root at Sarva /mnt]#cd nand/
[root at Sarva nand]#df
Filesystem           1k-blocks      Used Available Use% Mounted on
/dev/mtdblock2           31488     24892      6596  79% /
/dev/mtdblock3           65520     12384     53136  19% /mnt/nand

Voila where we started from

My nand driver is 
/*
 *  drivers/mtd/nand/spia.c
 *
 *  Copyright (C) 2000 Steven J. Hill (sjhill at realitydiluted.com)
 *
 *
 *      10-29-2001 TG   change to support hardwarespecific access
 *                      to controllines (due to change in nand.c)
 *                      page_cache added
 *
 * $Id: spia.c,v 1.21 2003/07/11 15:12:29 dwmw2 Exp $
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
#include <asm/sizes.h>
#include <asm/arch-pxa/pxa-regs.h>
/*
 * MTD structure for SPIA board
 */
static struct mtd_info *spia_mtd = NULL;

/*
 * Values specific to the SPIA board (used with EP7212 processor)
 */
#define SPIA_IO_BASE    0xd0000000      /* Start of EP7212 IO address space */
#define SPIA_FIO_BASE   0x06000000      /* Address where flash is mapped */
#define SPIA_PEDR       0x0080          /*
                                         * IO offset to Port E data register
                                         * where the CLE, ALE and NCE pins
                                         * are wired to.
                                         */
#define SPIA_PEDDR      0x00c0          /*
                                         * IO offset to Port E data direction
                                         * register so we can control the IO
                                         * lines.
                                         */

/*
 * Module stuff
 */

//static int spia_io_base = SPIA_IO_BASE;
static int spia_fio_base = SPIA_FIO_BASE;
//static int spia_pedr = SPIA_PEDR;
//static int spia_peddr = SPIA_PEDDR;

//MODULE_PARM(spia_io_base, "i");
//MODULE_PARM(spia_fio_base, "i");
//MODULE_PARM(spia_pedr, "i");
//MODULE_PARM(spia_peddr, "i");

/*
 * Define partitions for flash device
 */
const static struct mtd_partition partition_info[] = {
        { name: "Filesystem on nand",
                offset: 0,
                size:   64 * SZ_1M},
};
#define NUM_PARTITIONS 1


/*
 *      hardware specific access to control-lines
*/
static void spia_hwcontrol(struct mtd_info *mtd, int cmd){

    switch(cmd){

        case NAND_CTL_SETCLE: GPSR2 = 0x80000;   break;
        case NAND_CTL_CLRCLE:GPCR2 = 0x80000;   break;

        case NAND_CTL_SETALE: GPSR2 = 0x100000; break;
        case NAND_CTL_CLRALE: GPCR2 = 0x100000;  break;

        case NAND_CTL_SETNCE: GPCR2 = 0x20000; break;
        case NAND_CTL_CLRNCE: GPSR2 = 0x20000; break;
    }
}

/*
 * Main initialization routine
 */
int __init spia_init (void)
{
        struct nand_chip *this;
        GPSR2 = 0x60000;
        GPDR2 |= 0x1e0000;

        GPCR2 = 0x20000;
        /* Allocate memory for MTD device structure and private data */
        spia_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
                                GFP_KERNEL);
        if (!spia_mtd) {
                printk ("Unable to allocate SPIA NAND MTD device structure.\n");
                return -ENOMEM;
        }

        /* Get pointer to private data */
        this = (struct nand_chip *) (&spia_mtd[1]);

        /* Initialize structures */
        memset((char *) spia_mtd, 0, sizeof(struct mtd_info));
        memset((char *) this, 0, sizeof(struct nand_chip));
spia_fio_base=(unsigned long)ioremap(spia_fio_base,SZ_1K);
        /* Link the private data with the MTD structure */
        spia_mtd->priv = this;

        /*
         * Set GPIO Port E control register so that the pins are configured
         * to be outputs for controlling the NAND flash.
         */
        //(*(volatile unsigned char *) (spia_io_base + spia_peddr)) = 0x07;

        /* Set address of NAND IO lines */
        this->IO_ADDR_R = spia_fio_base;
        this->IO_ADDR_W = spia_fio_base;
        /* Set address of hardware control function */
        this->hwcontrol = spia_hwcontrol;
        /* 15 us command delay time */
        this->chip_delay = 20;
        this->eccmode = NAND_ECC_NONE;

        /* Scan to find existence of the device */
        if (nand_scan (spia_mtd, 1)) {
                kfree (spia_mtd);
                return -ENXIO;
        }

        /* Allocate memory for internal data buffer */
        this->data_buf = kmalloc (sizeof(u_char) * (spia_mtd->oobblock
+ spia_mtd->oobsize), GFP_KERNEL);
        if (!this->data_buf) {
                printk ("Unable to allocate NAND data buffer for SPIA.\n");
                kfree (spia_mtd);
                return -ENOMEM;
        }

        /* Register the partitions */
        add_mtd_partitions(spia_mtd, partition_info, NUM_PARTITIONS);

        /* Return happy */
        return 0;
}
module_init(spia_init);

/*
 * Clean up routine
 */
#ifdef MODULE
static void __exit spia_cleanup (void)
{
        struct nand_chip *this = (struct nand_chip *) &spia_mtd[1];

        /* Unregister the device */
        del_mtd_device (spia_mtd);

        /* Free internal data buffer */
        kfree (this->data_buf);

        /* Free the MTD device structure */
        kfree (spia_mtd);
}
module_exit(spia_cleanup);
#endif

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Steven J. Hill <sjhill at realitydiluted.com");
MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on SPIA board");

--------------
and my .config of the kernel has these options 
#
# File systems
#
CONFIG_YAFFS_FS=y
CONFIG_YAFFS_MTD_ENABLED=y
# CONFIG_YAFFS_RAM_ENABLED is not set
CONFIG_YAFFS_USE_NANDECC=y
# CONFIG_YAFFS_ECC_WRONG_ORDER is not set
CONFIG_YAFFS_USE_GENERIC_RW=y
# CONFIG_YAFFS_USE_HEADER_FILE_SIZE is not set
CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK=y
CONFIG_YAFFS_SHORT_NAMES_IN_RAM=y

When ever i build the kernel i get to see these errors
fs/yaffs/yaffs_fs.c:169: warning: initialization from incompatible pointer type
fs/yaffs/yaffs_fs.c: At top level:
fs/yaffs/yaffs_fs.c:683: warning: 'yaffs_file_read' defined but not used
fs/yaffs/yaffs_fs.c:1480: warning: 'yaffs_internal_read_super_ram'
defined but not used
fs/yaffs/yaffs_fs.c:1550: warning: 'my_proc_ram_write_entry' defined
but not used
fs/yaffs/yaffs_fs.c:1623: warning: 'yaffs_proc_ram_write' defined but not used


Does anyone have any clues why this might be happening.  

Manav



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