Mounting mtd block device raises "Block device required"

[Hinko Kocevar]

Andre Puschmann wrote:
> Hi,
> 
> Hinko Kocevar wrote:
>> Char device seems to work..
> 
> Yes, sorry for being not precise.
> Coping a jffs2 image (in 2.6.25) at /dev/mtd5 and mouting the same one
> in 2.6.21 (/dev/mtdblock5) works. So accessing the flash as a character
> device works.
> 
>> What is the ls -l /dev/mtdblock5 output?
> 
> As expected:
> $ ls -l /dev/mtdblock5
> brw-rw----    1 root     root      31,   5 Jan  1  1970 /dev/mtdblock5
> 

Good.

> 
>> Also could you try:
>> mount -t jffs2 /dev/mtdblock5 /mnt/flash
> 
> I also tried that:
> 
> # mount -t jffs2 /dev/mtdblock5 /mnt/flash
> mount: mounting /dev/mtdblock5 on /mnt/flash failed: Invalid argument
> 

Is this true (kernel config)?:
CONFIG_JFFS2_FS=y

> 
> But it seems like it has to do something with the block device driver
> mapping:
> 
> $ head -n 2 /dev/mtdblock5 | hexdump -C
> head: /dev/mtdblock5: No such device or address
> 

What about kernel configuration around the MTD block devices? I think these should be enabled:
CONFIG_MTD_BLKDEVS=y
CONFIG_MTD_BLOCK=y

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