Q: Cramfs Vs. Ubifs

[Ricard Wanderlof]

On Wed, 13 Jun 2012, Ran Shalit wrote:

>> Even if you copy all files to a RAM-based file system, such as /tmp, they
>> still need to be copied from the file system to directly accessible memory
>> before execution. While it may be faster than performing the same operation
>> from flash, the demand paging functionality is still in operation.
>>
>> The only way to avoid it would be to force loading of all pages for a
>> program at its start, I've never had the need so I don't know how though.
>>
>>
> Yes, that what I meant. At the initialization stage we will copy all
> files from ubifs section into root file system in RAM and so I assume
> that there will be no any access to flash during application life for
> read or write (any desired access will be controlled by application).
> I wonder why I didn't find any information about disadvantage of using
> ubifs as root file system in embedded system in terms of access to
> flash during application life.

I think because it normally is not a problem. Also, the same goes for any 
file system which resides on the flash, it's not a ubifs-specific problem.

/Ricard
-- 
Ricard Wolf Wanderlöf                           ricardw(at)axis.com
Axis Communications AB, Lund, Sweden            www.axis.com
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