mtd devices & jffs

[Rogelio M. Serrano Jr.]

The same happens to me and im using a DOC2000. The second time i mount
jffs fails to build the tree.

Juan Gonzo wrote:

> Compiled the MTD code into a Linux 2.2.14 kernel and
> loaded it onto our system (ARM processor and Intel Strataflash).
>
> The system boots up.  Here is the MTD related messages:
>
> =======================================
>
> NORA: Found a coupled pair of CFI devices at location 0 in 16 bit mode
> Primary Vendor Command Set: 0001 (Intel/Sharp Extended)
> Primary Algorithm Table at 0031
> Alternative Vendor Command Set: 0000 (None)
> No Alternate Algorithm Table
> Vcc Minimum: 2.7 V
> Vcc Maximum: 3.6 V
> No Vpp line
> Typical byte/word write timeout: 128 µs
> Maximum byte/word write timeout: 2048 µs
> Typical full buffer write timeout: 128 µs
> Maximum full buffer write timeout: 2048 µs
> Typical block erase timeout: 1024 µs
> Maximum block erase timeout: 16384 µs
> Chip erase not supported
> Device size: 0x1000000 bytes (16 Mb)
> Flash Device Interface description: 0x0002
>   - supports x8 and x16 via BYTE# with asynchronous interface
> Max. bytes in buffer write: 0x20
> Number of Erase Block Regions: 1
>   Erase Region #0: BlockSize 0x20000 bytes, 128 blocks
>
>  Intel/Sharp Extended Query Table at 0x0031
> number of CFI chips: 1
>
> =======================================
>
> Everything looks ok.  I can't get the MAKEDEV script to
> run on our system, so I try to do a couple manually.  I
> enter 'mknod /dev/mtd0 c 90 0' and then
> 'mknod /dev/mtdblock0 b 31 0'.  Both work and the devices
> are present in the /dev dir.  However when I try to mount
> JFFS using 'mount -t jfss /dev/mtdblock0 /mnt', I get the
> following:
>
> =======================================
>
> [root at Linux /dev]$mount -t jffs /dev/mtdblock0 /mnt
> JFFS: Trying to mount device 1f:00.
> jffs_scan_flash(): start pos = 0x0, end = 0x16777216
> jffs_scan_flash(): 0xff at pos 0x0.
> jffs_scan_flash(): 0xff ended at pos 0x1097152.
> jffs_scan_flash(): 0x00 at pos 0x1097152.
> jffs_scan_flash(): 0x00 ended at pos 0x1098176.
> *************** Dirty flash memory or bad inode: hexdump(pos =
> 0x1098176, len =
> 128):
> 1098176: 0018 0000 0018 0000 3d00 0000 ac05 0000  ........=.......
> 1098192: 8f16 0000 0100 0000 0000 0000 0000 0000  ................
> 1098208: 0020 0000 0020 0000 0018 0000 8618 5d39  ..............]9
> 1098224: ea18 5d39 0100 1400 53ef 0100 0100 0000  ..]9....S.......
> 1098240: 8518 5d39 004e ed00 0000 0000 0100 0000  ..]9.N..........
> 1098256: 0000 0000 0b00 0000 8000 0000 0000 0000  ................
> 1098272: 0200 0000 0100 0000 d285 611c 3947 4857  ..........a.9GHW
> 1098288: a6c2 3cee 5e93 efb7 0000 0000 0000 0000  ..<.^...........
> Didn't read all bytes in flash_read_u32()
> Didn't read all bytes in flash_read_u32()
> Didn't read [etc, this line goes on for many many screens]
>
> =======================================
>
> Do I need to 'mknod' all the devices that MAKEDEV does?
> To me, this seems like a problem beyond that.
>
> Any suggestions as to what is going on?  Is it my flash?
>
> Thanks,
>    -- kelly
>
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