mtd block readonly low level nand driver cramfs

[Max Stirling]

Max Stirling wrote:
> I was looking at the chips folder under MTD and the MTD_ROM flag settings.
>
> I got this idea of having this low level driver code under chips with
> the MTD_ROM flag set and mounting this for cramfs.
>
> Please comment, especially folks using the RO FS mounted on flash.
>
> MS
>
> On Jan 24, 2008 3:12 PM, Max Stirling <vicky.irobot at gmail.com> wrote:
>   
>> Hi,
>>
>> This might sound quite basic question. This is the first time I am
>> looking into the MTD code so have some really basic questions.
>>
>> I am trying to mount a read only fs (cramfs) on the flash. Please let me
>> know if the following steps are right:
>>
>> 1. Enabled the following in the Kconfig files
>>     CONFIG_MTD_PARITIONS
>>     CONFIG_MTD
>>     CONFIG_MTD_BLOCK_RO
>>     CONFIG_MTD_NAND
>>     CONFIG_MTD_NAND_IDS
>>
>>
>> After booting the compiled kernel I am able to see the mtdblock under
>> /proc/devices using 31 Major number.
>>
>> Now for me to mount the cramfs image that is on the flash I need to
>> provide the low level nand driver code. This I need to write but before
>> starting that can any one point me to a reference nand driver code that
>> is used for read only mount? Which functionality would the MTD require
>> to be implemented for mounting a cramfs image which is on the flash.
>>
>> Would appreciate any pointers to how to get started off with this.
>>
>> thanks in advance for the reply.
>>
>> M.S
>>
>>
>>     
When using the cramfs as the fs for the flash and mtdblock_ro enabled. 
Which one should I be calling the user module, the cramfs or the 
mtdblock_ro?