why ubimkvol can't recognize /dev/ubi0?

[shizheng]

By default nandsim creates device of 8MB.
# cat /proc/mtd
dev:	size	erasesize  name
mtd0:	08000000 00004000  "NAND simulator partition 0"

>
> Vinit Agnihotri wrote:
>> yeah & 1 more...use mtdram instead of nandsim.
>> modprobe mtdram=40960 will create mtd device of size 40MB,
>> besides that you can write small tool for creating & deleting volumes,
>> its simple.
>> you can find ioctl's & structures code in include/mtd/ubi-user.h.
>>
>> --Vinit.
>>
>> On Jan 6, 2008 1:23 PM, Vinit Agnihotri <vinit.agnihotri at gmail.com> wrote:
>>     
>>> You have loaded Nandsim with default, may be theres not enough space
>>> on nandsim to create 20Mib volume,
>>> I guess by default nandsim creates device of 8MB. you can check it by
>>> looking a /proc/mtd.
>>> so try creating volume of smaller size or pass appropriate module
>>> parameters to nandsim module,
>>> do a modinfo nandsim or straight way have look in its code, I assume
>>> that you have proper privileges to run ubimkvol.
>>> still I dont have justification for that strange error, but try this out.
>>>
>>> --Vinit.
>>>
>>>
>>> On Jan 6, 2008 11:14 AM, 时正 <shizheng at mail.ustc.edu.cn> wrote:
>>>       
>>>> Hi all,
>>>> I wanna have a try of ubifs on nandsim, and do as what the ubifs wiki
>>>> tells me
>>>> (http://osl.sed.hu/wiki/ubifs/index.php/Download_the_source).
>>>>
>>>> 1. compile, install and boot the new kernel(2.6.23)
>>>> the configuration option for ubi and nandsim is default turned on as module.
>>>>
>>>>
>>>> 2. make the mtd-utils to produce ubimkvol
>>>>
>>>> 3. create a ubi when I got the error
>>>> # modprobe nandsim
>>>> # modprobe ubi mtd=0
>>>> # ls /dev/ubi0 -l
>>>> crw-rw---- 1 root root 253, 0 2007-12-25 01:46 /dev/ubi0
>>>> # ls /sys/class/ubi -l
>>>> drwxr-xr-x 3 root root 0 2007-12-25 01:46 ubi0
>>>> -r--r--r-- 1 root root 4096 2007-12-25 01:49 version
>>>> # ubimkvol /dev/ubi0 -n 0 -N test -s 20MiB
>>>> libubi error: readdir failed on "/sys/class/ubi"
>>>> readdir: No such file or directory
>>>> ubimkvol error: "/dev/ubi0" is not an UBI device node
>>>>
>>>> it's so strange about the readdir failure, because there is the ubi0
>>>> entry in sysfs.
>>>>
>>>> did I miss any step, such as kernel configuration or mtd-tools installation?
>>>>
>>>> Thanks a lot!
>>>>
>>>> best wishes, shizheng
>>>>
>>>>
>>>> ______________________________________________________
>>>> Linux MTD discussion mailing list
>>>> http://lists.infradead.org/mailman/listinfo/linux-mtd/
>>>>
>>>>         
>>>
>>> --
>>> Life is so short. So, follow some rules. Forgive quickly, believe
>>> slowly, love truly, laugh loudly & never avoid anything that makes U
>>> smile.
>>>
>>>       
>>
>>
>>