Readonly block device access to MTD devices

modulename: mtdblock_ro.ko

configname: CONFIG_MTD_BLOCK_RO

Linux Kernel Configuration
└─>Device Drivers
└─>Memory Technology Devices (MTD)
└─>Readonly block device access to MTD devices
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This allows you to mount read-only file systems (such as cramfs)
from an MTD device, without the overhead (and danger) of the caching
driver.

You do not need this option for use with the DiskOnChip devices. For
those, enable NFTL support (CONFIG_NFTL) instead.

source code: