NAND erase size problem

[Kschoo70C at netscape.net]

    Hi,
       I modified the mkfs.jffs2.c to remove the erase_block_size checking, so that I am able to create image with erase size of
    16KiB. The image created works fine. The following are the changes I made:
    @@ -1186,10 +1186,12 @@ int main(int argc, char **argv)
                           if (erase_block_size && erase_block_size < 0x1000)
                                   erase_block_size *= 1024;
                           /* If it's less than 64KiB, they're not allowed */
    +        #if 0
                           if (erase_block_size < 0x10000) {
                                   fprintf(stderr, "Increasing erase size to 64KiB minimum\n");
                                   erase_block_size = 0x10000;
                           }
    +        #endif

    By doing this, the Magic bitmask 0x1985 appeared at every 32 pages of the flash, which looks correct to me. Therefore, I gather
    that the enforcement of 64KiB in mkfs.jffs2.c utils is only a safe-guard for NOR flash. Please correct me if I do not understand
    this correctly.

    Thanks

    regards
    choo

Kschoo70C at netscape.net wrote:

>Hi,
>     I have a hardware that has a samsung 16MB NAND flash (K9F2808UoB -- page size 512 bytes, erase block size = 32 pages). I have a problem to copy the image created by mkfs.jffs2 to the mtd device. 
>    When I ask mkfs.jffs2 to create an image with erase size of 16KB, it will create image with erase size 64KiB instead. I suppose that is the minimum size set by mkfs.jffs2. When I copy the image to the mtd device, there is no error. However, when I mount to the mtdblock device, it gives me an error of "Perhaps the file system was created with the wrong erase size?" during scanning.
>   On the other hand, if I use the system "cp -a /rfs /mnt/nandroot" to transfer the file from NFS root to the flash, everything works fine. Therefore, I guess the NAND driver works fine.
>
>The following are my steps:
>On the host
>mkfs.jffs2 --eraseblock=16KiB -l -d ./lib -o lib.image
>    > Increasing erase size to 64KiB minimum
>
>On the target
>    # cat /proc/mtd
>    dev:    size   erasesize  name
>    mtd0: 00300000 00004000 "SPIA flash partition 1"
>    mtd1: 00d00000 00004000 "SPIA flash partition 2"
>
>    # eraseall /dev/mtd2
>    Erased 13312 Kibyte @ 0 -- 100% complete.
>    # cp ./lib.image /dev/mtd2
>    # mount -t jffs2 /dev/mtdblock1 /mnt/nandroot
>    Node at 0x00003884 with length 0x0000089e would run over the end of the erase block
>    Perhaps the file system was created with the wrong erase size?
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00003888: 0x089e instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000388c: 0xf358 instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00003890: 0x000d instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00003894: 0x0007 instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00003898: 0x81ff instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000389c: 0x0063 instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x000038a0: 0xfae4 instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x000038a4: 0x2ad2 instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x000038a8: 0x2ad2 instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x000038ac: 0x2ad2 instead
>    Further such events for this erase block will not be printed
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00004000: 0xc30f instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00004004: 0xc279 instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00004008: 0xa219 instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000400c: 0x6f73 instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00004010: 0xe29c instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00004014: 0x4438 instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00004018: 0x84e4 instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000401c: 0xbff9 instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00004020: 0xee7a instead
>    jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00004024: 0x8cd1 instead
>    Further such events for this erase block will not be printed
>
>=======================================================================
>
>     Can anyone tell me how to get the erase size for the nand image right ? Or could it be other problems ?
>
>      Thanks.
>
>regards
>choo
>
>
>__________________________________________________________________
>The NEW Netscape 7.0 browser is now available. Upgrade now! http://channels.netscape.com/ns/browsers/download.jsp 
>
>Get your own FREE, personal Netscape Mail account today at http://webmail.netscape.com/
>
>______________________________________________________
>Linux MTD discussion mailing list
>http://lists.infradead.org/mailman/listinfo/linux-mtd/
>

__________________________________________________________________
The NEW Netscape 7.0 browser is now available. Upgrade now! http://channels.netscape.com/ns/browsers/download.jsp 

Get your own FREE, personal Netscape Mail account today at http://webmail.netscape.com/