RAM based filesystem in uclinux

Hi folks,
I have some basic problem:

I have my uclinux currently running on Coldfire board from RAM. I have
romfs as my file system but that is read only file system.I donot enable
MTD support, blckmem is also disabled.

I enabled a RAM disk(CONFIG_BLK_DEV_RAM) and initrd(CONFIG_BLK_DEV_INITRD)
and choose rootfs as my filesystem.


Now I want to change my configuration so that I have a writable filesystem
in RAM.

I am confused with the configurations I need to set to choose a writable
file system for uclinux running from RAM.

What uclinux configuration I need to select to boot uclinux in RAM with
writeable filesystem?

I guess I donot need MTD because that is used for FLASH memory, Neither I
need blckmen that is also for FLASH memory. I need to just create a block
on RAM and just put a filesystem on that block.

Please correct me if I am wrong.

Please also proivde the reason which and why a particular configuration is
enabled. What role the config is playing in writeable filesystem?
Thanks a lot for replying

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